Add m-esr52 at 52.6.0

155 files changed, 18678 insertions, 0 deletions

diff --git a/dom/xbl/XBLChildrenElement.cpp b/dom/xbl/XBLChildrenElement.cpp
new file mode 100644
index 0000000000..e4058a7890
--- /dev/null
+++ b/dom/xbl/XBLChildrenElement.cpp
@@ -0,0 +1,205 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/XBLChildrenElement.h"
+#include "nsCharSeparatedTokenizer.h"
+#include "mozilla/dom/NodeListBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+XBLChildrenElement::~XBLChildrenElement()
+{
+}
+
+NS_IMPL_ADDREF_INHERITED(XBLChildrenElement, Element)
+NS_IMPL_RELEASE_INHERITED(XBLChildrenElement, Element)
+
+NS_INTERFACE_TABLE_HEAD(XBLChildrenElement)
+  NS_INTERFACE_TABLE_INHERITED(XBLChildrenElement, nsIDOMNode,
+                               nsIDOMElement)
+  NS_ELEMENT_INTERFACE_TABLE_TO_MAP_SEGUE
+NS_INTERFACE_MAP_END_INHERITING(Element)
+
+NS_IMPL_ELEMENT_CLONE(XBLChildrenElement)
+
+nsresult
+XBLChildrenElement::UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttribute,
+                              bool aNotify)
+{
+  if (aAttribute == nsGkAtoms::includes &&
+      aNameSpaceID == kNameSpaceID_None) {
+    mIncludes.Clear();
+  }
+
+  return Element::UnsetAttr(aNameSpaceID, aAttribute, aNotify);
+}
+
+bool
+XBLChildrenElement::ParseAttribute(int32_t aNamespaceID,
+                                   nsIAtom* aAttribute,
+                                   const nsAString& aValue,
+                                   nsAttrValue& aResult)
+{
+  if (aAttribute == nsGkAtoms::includes &&
+      aNamespaceID == kNameSpaceID_None) {
+    mIncludes.Clear();
+    nsCharSeparatedTokenizer tok(aValue, '|',
+                                 nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
+    while (tok.hasMoreTokens()) {
+      mIncludes.AppendElement(NS_Atomize(tok.nextToken()));
+    }
+  }
+
+  return false;
+}
+
+} // namespace dom
+} // namespace mozilla
+
+using namespace mozilla::dom;
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsAnonymousContentList, mParent)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsAnonymousContentList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsAnonymousContentList)
+
+NS_INTERFACE_TABLE_HEAD(nsAnonymousContentList)
+  NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
+  NS_INTERFACE_TABLE_INHERITED(nsAnonymousContentList, nsINodeList,
+                               nsIDOMNodeList)
+  NS_INTERFACE_TABLE_TO_MAP_SEGUE
+  NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsAnonymousContentList)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMETHODIMP
+nsAnonymousContentList::GetLength(uint32_t* aLength)
+{
+  if (!mParent) {
+    *aLength = 0;
+    return NS_OK;
+  }
+
+  uint32_t count = 0;
+  for (nsIContent* child = mParent->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    if (child->NodeInfo()->Equals(nsGkAtoms::children, kNameSpaceID_XBL)) {
+      XBLChildrenElement* point = static_cast<XBLChildrenElement*>(child);
+      if (point->HasInsertedChildren()) {
+        count += point->InsertedChildrenLength();
+      }
+      else {
+        count += point->GetChildCount();
+      }
+    }
+    else {
+      ++count;
+    }
+  }
+
+  *aLength = count;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAnonymousContentList::Item(uint32_t aIndex, nsIDOMNode** aReturn)
+{
+  nsIContent* item = Item(aIndex);
+  if (!item) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return CallQueryInterface(item, aReturn);
+}
+
+nsIContent*
+nsAnonymousContentList::Item(uint32_t aIndex)
+{
+  if (!mParent) {
+    return nullptr;
+  }
+
+  uint32_t remIndex = aIndex;
+  for (nsIContent* child = mParent->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    if (child->NodeInfo()->Equals(nsGkAtoms::children, kNameSpaceID_XBL)) {
+      XBLChildrenElement* point = static_cast<XBLChildrenElement*>(child);
+      if (point->HasInsertedChildren()) {
+        if (remIndex < point->InsertedChildrenLength()) {
+          return point->InsertedChild(remIndex);
+        }
+        remIndex -= point->InsertedChildrenLength();
+      }
+      else {
+        if (remIndex < point->GetChildCount()) {
+          return point->GetChildAt(remIndex);
+        }
+        remIndex -= point->GetChildCount();
+      }
+    }
+    else {
+      if (remIndex == 0) {
+        return child;
+      }
+      --remIndex;
+    }
+  }
+
+  return nullptr;
+}
+
+int32_t
+nsAnonymousContentList::IndexOf(nsIContent* aContent)
+{
+  NS_ASSERTION(!aContent->NodeInfo()->Equals(nsGkAtoms::children,
+                                             kNameSpaceID_XBL),
+               "Looking for insertion point");
+
+  if (!mParent) {
+    return -1;
+  }
+
+  int32_t index = 0;
+  for (nsIContent* child = mParent->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    if (child->NodeInfo()->Equals(nsGkAtoms::children, kNameSpaceID_XBL)) {
+      XBLChildrenElement* point = static_cast<XBLChildrenElement*>(child);
+      if (point->HasInsertedChildren()) {
+        int32_t insIndex = point->IndexOfInsertedChild(aContent);
+        if (insIndex != -1) {
+          return index + insIndex;
+        }
+        index += point->InsertedChildrenLength();
+      }
+      else {
+        int32_t insIndex = point->IndexOf(aContent);
+        if (insIndex != -1) {
+          return index + insIndex;
+        }
+        index += point->GetChildCount();
+      }
+    }
+    else {
+      if (child == aContent) {
+        return index;
+      }
+      ++index;
+    }
+  }
+
+  return -1;
+}
+
+JSObject*
+nsAnonymousContentList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
+{
+  return mozilla::dom::NodeListBinding::Wrap(cx, this, aGivenProto);
+}
diff --git a/dom/xbl/XBLChildrenElement.h b/dom/xbl/XBLChildrenElement.h
new file mode 100644
index 0000000000..4714da4a84
--- /dev/null
+++ b/dom/xbl/XBLChildrenElement.h
@@ -0,0 +1,192 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLChildrenElement_h___
+#define nsXBLChildrenElement_h___
+
+#include "nsIDOMElement.h"
+#include "nsINodeList.h"
+#include "nsBindingManager.h"
+#include "mozilla/dom/nsXMLElement.h"
+
+class nsAnonymousContentList;
+
+namespace mozilla {
+namespace dom {
+
+class XBLChildrenElement : public nsXMLElement
+{
+public:
+  explicit XBLChildrenElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
+    : nsXMLElement(aNodeInfo)
+  {
+  }
+  explicit XBLChildrenElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
+    : nsXMLElement(aNodeInfo)
+  {
+  }
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // nsINode interface methods
+  virtual nsresult Clone(mozilla::dom::NodeInfo* aNodeInfo, nsINode** aResult) const override;
+
+  virtual nsIDOMNode* AsDOMNode() override { return this; }
+
+  // nsIContent interface methods
+  virtual nsresult UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttribute,
+                             bool aNotify) override;
+  virtual bool ParseAttribute(int32_t aNamespaceID,
+                              nsIAtom* aAttribute,
+                              const nsAString& aValue,
+                              nsAttrValue& aResult) override;
+
+  void AppendInsertedChild(nsIContent* aChild)
+  {
+    mInsertedChildren.AppendElement(aChild);
+    aChild->SetXBLInsertionParent(GetParent());
+
+    // Appending an inserted child causes the inserted
+    // children to be projected instead of default content.
+    MaybeRemoveDefaultContent();
+  }
+
+  void InsertInsertedChildAt(nsIContent* aChild, uint32_t aIndex)
+  {
+    mInsertedChildren.InsertElementAt(aIndex, aChild);
+    aChild->SetXBLInsertionParent(GetParent());
+
+    // Inserting an inserted child causes the inserted
+    // children to be projected instead of default content.
+    MaybeRemoveDefaultContent();
+  }
+
+  void RemoveInsertedChild(nsIContent* aChild)
+  {
+    // Can't use this assertion as we cheat for dynamic insertions and
+    // only insert in the innermost insertion point.
+    //NS_ASSERTION(mInsertedChildren.Contains(aChild),
+    //             "Removing child that's not there");
+    mInsertedChildren.RemoveElement(aChild);
+
+    // After removing the inserted child, default content
+    // may be projected into this insertion point.
+    MaybeSetupDefaultContent();
+  }
+
+  void ClearInsertedChildren()
+  {
+    for (uint32_t c = 0; c < mInsertedChildren.Length(); ++c) {
+      mInsertedChildren[c]->SetXBLInsertionParent(nullptr);
+    }
+    mInsertedChildren.Clear();
+
+    // After clearing inserted children, default content
+    // will be projected into this insertion point.
+    MaybeSetupDefaultContent();
+  }
+
+  void MaybeSetupDefaultContent()
+  {
+    if (!HasInsertedChildren()) {
+      for (nsIContent* child = static_cast<nsINode*>(this)->GetFirstChild();
+           child;
+           child = child->GetNextSibling()) {
+        child->SetXBLInsertionParent(GetParent());
+      }
+    }
+  }
+
+  void MaybeRemoveDefaultContent()
+  {
+    if (!HasInsertedChildren()) {
+      for (nsIContent* child = static_cast<nsINode*>(this)->GetFirstChild();
+           child;
+           child = child->GetNextSibling()) {
+        child->SetXBLInsertionParent(nullptr);
+      }
+    }
+  }
+
+  uint32_t InsertedChildrenLength()
+  {
+    return mInsertedChildren.Length();
+  }
+
+  bool HasInsertedChildren()
+  {
+    return !mInsertedChildren.IsEmpty();
+  }
+
+  int32_t IndexOfInsertedChild(nsIContent* aChild)
+  {
+    return mInsertedChildren.IndexOf(aChild);
+  }
+
+  bool Includes(nsIContent* aChild)
+  {
+    NS_ASSERTION(!mIncludes.IsEmpty(),
+                 "Shouldn't check for includes on default insertion point");
+    return mIncludes.Contains(aChild->NodeInfo()->NameAtom());
+  }
+
+  bool IsDefaultInsertion()
+  {
+    return mIncludes.IsEmpty();
+  }
+
+  nsIContent* InsertedChild(uint32_t aIndex)
+  {
+    return mInsertedChildren[aIndex];
+  }
+
+protected:
+  ~XBLChildrenElement();
+
+private:
+  nsTArray<nsIContent*> mInsertedChildren; // WEAK
+  nsTArray<nsCOMPtr<nsIAtom> > mIncludes;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+class nsAnonymousContentList : public nsINodeList
+{
+public:
+  explicit nsAnonymousContentList(nsIContent* aParent)
+    : mParent(aParent)
+  {
+    MOZ_COUNT_CTOR(nsAnonymousContentList);
+  }
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsAnonymousContentList)
+  // nsIDOMNodeList interface
+  NS_DECL_NSIDOMNODELIST
+
+  // nsINodeList interface
+  virtual int32_t IndexOf(nsIContent* aContent) override;
+  virtual nsINode* GetParentObject() override { return mParent; }
+  virtual nsIContent* Item(uint32_t aIndex) override;
+
+  virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;
+
+  bool IsListFor(nsIContent* aContent) {
+    return mParent == aContent;
+  }
+
+private:
+  virtual ~nsAnonymousContentList()
+  {
+    MOZ_COUNT_DTOR(nsAnonymousContentList);
+  }
+
+  nsCOMPtr<nsIContent> mParent;
+};
+
+#endif // nsXBLChildrenElement_h___
diff --git a/dom/xbl/builtin/android/jar.mn b/dom/xbl/builtin/android/jar.mn
new file mode 100644
index 0000000000..9f05c2dd6c
--- /dev/null
+++ b/dom/xbl/builtin/android/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolkit.jar:
+* content/global/platformHTMLBindings.xml   (platformHTMLBindings.xml)
diff --git a/dom/xbl/builtin/android/moz.build b/dom/xbl/builtin/android/moz.build
new file mode 100644
index 0000000000..eb4454d28f
--- /dev/null
+++ b/dom/xbl/builtin/android/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
\ No newline at end of file
diff --git a/dom/xbl/builtin/android/platformHTMLBindings.xml b/dom/xbl/builtin/android/platformHTMLBindings.xml
new file mode 100644
index 0000000000..03363c1b5e
--- /dev/null
+++ b/dom/xbl/builtin/android/platformHTMLBindings.xml
@@ -0,0 +1,162 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<bindings id="htmlBindings"
+   xmlns="http://www.mozilla.org/xbl"
+   xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+  <binding id="inputFields" bindToUntrustedContent="true">
+    <handlers>
+#include ../input-fields-base.inc
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_wordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_wordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" command="cmd_selectWordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" command="cmd_selectWordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="alt" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="alt" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,alt" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,alt" command="cmd_selectEndLine"/>
+
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_deleteToBeginningOfLine"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="alt" command="cmd_deleteToEndOfLine"/>
+    </handlers>
+  </binding>
+
+  <binding id="textAreas" bindToUntrustedContent="true">
+    <handlers>
+#include ../textareas-base.inc
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_wordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_wordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" command="cmd_selectWordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" command="cmd_selectWordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="alt" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="alt" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,alt" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,alt" command="cmd_selectEndLine"/>
+
+      <handler event="keypress" keycode="VK_UP" modifiers="alt" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="alt" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift,alt" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift,alt" command="cmd_selectBottom"/>
+
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="alt" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="alt" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift,alt" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift,alt" command="cmd_selectBottom"/>
+
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom" />
+
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_deleteToBeginningOfLine"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="alt" command="cmd_deleteToEndOfLine"/>
+    </handlers>
+  </binding>
+
+  <binding id="browser">
+    <handlers>
+#include ../browser-base.inc
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectCharPrevious" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectCharNext" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_wordPrevious" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_wordNext" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control,shift" command="cmd_selectWordPrevious" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control,shift" command="cmd_selectWordNext" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="alt" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="alt" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,alt" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,alt" command="cmd_selectEndLine"/>
+
+      <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectLinePrevious" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectLineNext" />
+      <handler event="keypress" keycode="VK_UP" modifiers="alt" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="alt" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift,alt" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift,alt" command="cmd_selectBottom"/>
+
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="alt" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="alt" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift,alt" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift,alt" command="cmd_selectBottom"/>
+
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom" />
+
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_deleteToBeginningOfLine"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="alt" command="cmd_deleteToEndOfLine"/>
+    </handlers>
+  </binding>
+
+  <binding id="editor">
+    <handlers>
+#include ../editor-base.inc
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_wordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_wordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" command="cmd_selectWordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" command="cmd_selectWordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="alt" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="alt" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,alt" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,alt" command="cmd_selectEndLine"/>
+
+      <handler event="keypress" keycode="VK_UP" modifiers="alt" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="alt" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift,alt" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift,alt" command="cmd_selectBottom"/>
+
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="alt" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="alt" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift,alt" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift,alt" command="cmd_selectBottom"/>
+
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom" />
+
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_deleteToBeginningOfLine"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="alt" command="cmd_deleteToEndOfLine"/>
+    </handlers>
+  </binding>
+</bindings>
diff --git a/dom/xbl/builtin/browser-base.inc b/dom/xbl/builtin/browser-base.inc
new file mode 100644
index 0000000000..03264c2709
--- /dev/null
+++ b/dom/xbl/builtin/browser-base.inc
@@ -0,0 +1,14 @@
+      <handler event="keypress" key=" " modifiers="shift" command="cmd_scrollPageUp" />
+      <handler event="keypress" key=" " command="cmd_scrollPageDown" />
+
+      <handler event="keypress" keycode="VK_UP" command="cmd_moveUp" />
+      <handler event="keypress" keycode="VK_DOWN" command="cmd_moveDown" />
+      <handler event="keypress" keycode="VK_LEFT" command="cmd_moveLeft" />
+      <handler event="keypress" keycode="VK_RIGHT" command="cmd_moveRight" />
+
+      <handler event="keypress" key="x" command="cmd_cut" modifiers="accel"/>
+      <handler event="keypress" key="c" command="cmd_copy" modifiers="accel"/>
+      <handler event="keypress" key="v" command="cmd_paste" modifiers="accel"/>
+      <handler event="keypress" key="z" command="cmd_undo" modifiers="accel"/>
+      <handler event="keypress" key="z" command="cmd_redo" modifiers="accel,shift" />
+      <handler event="keypress" key="a" command="cmd_selectAll" modifiers="accel"/>
diff --git a/dom/xbl/builtin/editor-base.inc b/dom/xbl/builtin/editor-base.inc
new file mode 100644
index 0000000000..1084da8144
--- /dev/null
+++ b/dom/xbl/builtin/editor-base.inc
@@ -0,0 +1,19 @@
+      <handler event="keypress" key=" " modifiers="shift" command="cmd_scrollPageUp" />
+      <handler event="keypress" key=" " command="cmd_scrollPageDown" />
+
+      <handler event="keypress" keycode="VK_LEFT" command="cmd_moveLeft"/>
+      <handler event="keypress" keycode="VK_RIGHT" command="cmd_moveRight"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectLeft"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectRight"/>
+
+      <handler event="keypress" keycode="VK_UP" command="cmd_moveUp"/>
+      <handler event="keypress" keycode="VK_DOWN" command="cmd_moveDown"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectUp"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectDown"/>
+
+      <handler event="keypress" key="z" command="cmd_undo" modifiers="accel"/>
+      <handler event="keypress" key="z" command="cmd_redo" modifiers="accel,shift" />
+      <handler event="keypress" key="x" command="cmd_cut" modifiers="accel"/>
+      <handler event="keypress" key="c" command="cmd_copy" modifiers="accel"/>
+      <handler event="keypress" key="v" command="cmd_paste" modifiers="accel"/>
+      <handler event="keypress" key="v" command="cmd_pasteNoFormatting" modifiers="accel,shift"/>
diff --git a/dom/xbl/builtin/emacs/jar.mn b/dom/xbl/builtin/emacs/jar.mn
new file mode 100644
index 0000000000..9f05c2dd6c
--- /dev/null
+++ b/dom/xbl/builtin/emacs/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolkit.jar:
+* content/global/platformHTMLBindings.xml   (platformHTMLBindings.xml)
diff --git a/dom/xbl/builtin/emacs/moz.build b/dom/xbl/builtin/emacs/moz.build
new file mode 100644
index 0000000000..eb4454d28f
--- /dev/null
+++ b/dom/xbl/builtin/emacs/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
\ No newline at end of file
diff --git a/dom/xbl/builtin/emacs/platformHTMLBindings.xml b/dom/xbl/builtin/emacs/platformHTMLBindings.xml
new file mode 100644
index 0000000000..76c214ffa1
--- /dev/null
+++ b/dom/xbl/builtin/emacs/platformHTMLBindings.xml
@@ -0,0 +1,237 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<bindings id="htmlBindings"
+   xmlns="http://www.mozilla.org/xbl"
+   xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ 
+  <binding id="inputFields" bindToUntrustedContent="true">
+    <handlers>
+#include ../input-fields-base.inc
+    <!-- Emacsish single-line motion and delete keys -->
+    <handler event="keypress" key="a" modifiers="control"
+        command="cmd_beginLine"/>
+    <handler event="keypress" key="e" modifiers="control"
+        command="cmd_endLine"/>
+    <handler event="keypress" key="b" modifiers="control"
+        command="cmd_charPrevious"/>
+    <handler event="keypress" key="f" modifiers="control"
+        command="cmd_charNext"/>
+    <handler event="keypress" key="h" modifiers="control"
+        command="cmd_deleteCharBackward"/>
+    <handler event="keypress" key="d" modifiers="control"
+        command="cmd_deleteCharForward"/>
+    <handler event="keypress" key="w" modifiers="control"
+        command="cmd_deleteWordBackward"/>
+    <handler event="keypress" key="u" modifiers="control"
+        command="cmd_deleteToBeginningOfLine"/>
+    <handler event="keypress" key="k" modifiers="control"
+        command="cmd_deleteToEndOfLine"/>
+
+    <!-- Alternate Windows copy/paste/undo/redo keys -->
+    <handler event="keypress" keycode="VK_DELETE" modifiers="shift"
+        command="cmd_cutOrDelete"/>
+    <handler event="keypress" keycode="VK_DELETE" modifiers="control"
+        command="cmd_copyOrDelete"/>
+    <handler event="keypress" keycode="VK_INSERT" modifiers="control" 
+        command="cmd_copy"/>
+    <handler event="keypress" keycode="VK_INSERT" modifiers="shift"
+        command="cmd_paste"/>
+
+    <!-- navigating by word keys -->
+    <handler event="keypress" keycode="VK_HOME" 
+        command="cmd_beginLine"/>
+    <handler event="keypress" keycode="VK_END" 
+        command="cmd_endLine"/>
+    <handler event="keypress" keycode="VK_HOME" modifiers="shift"
+        command="cmd_selectBeginLine"/>
+    <handler event="keypress" keycode="VK_END" modifiers="shift"
+        command="cmd_selectEndLine"/>
+    <handler event="keypress" keycode="VK_HOME" modifiers="control"
+        command="cmd_beginLine"/>
+    <handler event="keypress" keycode="VK_END" modifiers="control" 
+        command="cmd_endLine"/>
+    <handler event="keypress" keycode="VK_HOME" modifiers="control,shift"
+        command="cmd_selectBeginLine"/>
+    <handler event="keypress" keycode="VK_END" modifiers="control,shift"
+        command="cmd_selectEndLine"/>
+    <handler event="keypress" keycode="VK_BACK" modifiers="control"
+        command="cmd_deleteWordBackward"/>
+
+    <handler event="keypress" keycode="VK_LEFT" modifiers="control" 
+        command="cmd_wordPrevious"/>
+    <handler event="keypress" keycode="VK_RIGHT" modifiers="control"
+        command="cmd_wordNext"/>
+    <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" 
+        command="cmd_selectWordPrevious"/>
+    <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" 
+        command="cmd_selectWordNext"/>
+    <handler event="keypress" key="y" modifiers="accel"
+        command="cmd_redo"/>
+    <handler event="keypress" key="a" modifiers="alt"
+        command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+
+  <binding id="textAreas" bindToUntrustedContent="true">
+    <handlers>
+#include ../textareas-base.inc
+    <!-- Emacsish single-line motion and delete keys -->
+    <handler event="keypress" key="a" modifiers="control"
+        command="cmd_beginLine"/>
+    <handler event="keypress" key="e" modifiers="control"
+        command="cmd_endLine"/>
+    <handler event="keypress" id="key_left" key="b" modifiers="control"
+        command="cmd_charPrevious"/>
+    <handler event="keypress" id="key_right" key="f" modifiers="control"
+        command="cmd_charNext"/>
+    <handler event="keypress" id="key_delback" key="h" modifiers="control"
+        command="cmd_deleteCharBackward"/>
+    <handler event="keypress" id="key_delforw" key="d" modifiers="control"
+        command="cmd_deleteCharForward"/>
+    <handler event="keypress" id="key_delwback" key="w" modifiers="control"
+        command="cmd_deleteWordBackward"/>
+    <handler event="keypress" id="key_del_bol" key="u" modifiers="control"
+        command="cmd_deleteToBeginningOfLine"/>
+    <handler event="keypress" id="key_del_eol" key="k" modifiers="control"
+        command="cmd_deleteToEndOfLine"/>
+
+    <!-- Alternate Windows copy/paste/undo/redo keys -->
+    <handler event="keypress" keycode="VK_DELETE" modifiers="shift"
+        command="cmd_cutOrDelete"/>
+    <handler event="keypress" keycode="VK_DELETE" modifiers="control"
+        command="cmd_copyOrDelete"/>
+    <handler event="keypress" keycode="VK_INSERT" modifiers="control"
+        command="cmd_copy"/>
+    <handler event="keypress" keycode="VK_INSERT" modifiers="shift"
+        command="cmd_paste"/>
+
+    <!-- Emacsish multi-line motion and delete keys -->
+    <handler event="keypress" id="key_linedown" key="n" modifiers="control"
+        command="cmd_lineNext"/>
+    <handler event="keypress" id="key_lineup" key="p" modifiers="control"
+        command="cmd_linePrevious"/>
+
+    <!-- handle home/end/arrow keys and redo -->
+    <handler event="keypress" keycode="VK_HOME" 
+        command="cmd_beginLine"/>
+    <handler event="keypress" keycode="VK_END" 
+        command="cmd_endLine"/>
+    <handler event="keypress" keycode="VK_HOME" modifiers="shift"
+        command="cmd_selectBeginLine"/>
+    <handler event="keypress" keycode="VK_END" modifiers="shift"
+        command="cmd_selectEndLine"/>
+
+    <handler event="keypress" keycode="VK_HOME" modifiers="control" 
+        command="cmd_moveTop"/>
+    <handler event="keypress" keycode="VK_END" modifiers="control" 
+        command="cmd_moveBottom"/>
+    <handler event="keypress" keycode="VK_HOME" modifiers="shift,control"
+        command="cmd_selectTop"/>
+    <handler event="keypress" keycode="VK_END" modifiers="shift,control"
+        command="cmd_selectBottom"/>
+
+    <handler event="keypress" keycode="VK_PAGE_UP" 
+        command="cmd_movePageUp"/>
+    <handler event="keypress" keycode="VK_PAGE_DOWN" 
+        command="cmd_movePageDown"/>
+    <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift"
+        command="cmd_selectPageUp"/>
+    <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift"
+        command="cmd_selectPageDown"/>
+
+    <handler event="keypress" keycode="VK_LEFT" modifiers="control" 
+        command="cmd_wordPrevious"/>
+    <handler event="keypress" keycode="VK_RIGHT" modifiers="control" 
+        command="cmd_wordNext"/>
+    <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" 
+        command="cmd_selectWordPrevious"/>
+    <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" 
+        command="cmd_selectWordNext"/>
+    <handler event="keypress" keycode="VK_BACK" modifiers="control"
+        command="cmd_deleteWordBackward"/>
+    <handler event="keypress" key="y" modifiers="accel"
+        command="cmd_redo"/>
+    <handler event="keypress" key="a" modifiers="alt"
+        command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+
+  <binding id="browser">
+    <handlers>
+#include ../browser-base.inc
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cut" /> 
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_copy" /> 
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy" /> 
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop" /> 
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom" /> 
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_wordPrevious" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_wordNext" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control,shift" command="cmd_selectWordPrevious" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control,shift" command="cmd_selectWordNext" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectCharPrevious" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectCharNext" />
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+      <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectLinePrevious" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectLineNext" />
+      <handler event="keypress" key="a" modifiers="alt" command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+
+  <binding id="editor">
+    <handlers>
+#include ../editor-base.inc
+      <handler event="keypress" key="h" modifiers="control" command="cmd_deleteCharBackward"/>
+      <handler event="keypress" key="d" modifiers="control" command="cmd_deleteCharForward"/>
+      <handler event="keypress" key="k" modifiers="control" command="cmd_deleteToEndOfLine"/>
+      <handler event="keypress" key="u" modifiers="control" command="cmd_deleteToBeginningOfLine"/>
+      <handler event="keypress" key="a" modifiers="control" command="cmd_beginLine"/>
+      <handler event="keypress" key="e" modifiers="control" command="cmd_endLine"/>
+      <handler event="keypress" key="b" modifiers="control" command="cmd_charPrevious"/>
+      <handler event="keypress" key="f" modifiers="control" command="cmd_charNext"/>
+      <handler event="keypress" key="p" modifiers="control" command="cmd_linePrevious"/>
+      <handler event="keypress" key="n" modifiers="control" command="cmd_lineNext"/>
+      <handler event="keypress" key="x" modifiers="control" command="cmd_cut"/>
+      <handler event="keypress" key="c" modifiers="control" command="cmd_copy"/>
+      <handler event="keypress" key="v" modifiers="control" command="cmd_paste"/>
+      <handler event="keypress" key="z" modifiers="control" command="cmd_undo"/>
+      <handler event="keypress" key="y" modifiers="accel"   command="cmd_redo"/>
+      <handler event="keypress" key="a" modifiers="alt" command="cmd_selectAll"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cutOrDelete"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_copyOrDelete"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="shift" command="cmd_paste"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_wordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_wordNext"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" command="cmd_selectWordPrevious"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" command="cmd_selectWordNext"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="control" command="cmd_deleteWordBackward"/>
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+    </handlers>
+  </binding>
+</bindings>
diff --git a/dom/xbl/builtin/input-fields-base.inc b/dom/xbl/builtin/input-fields-base.inc
new file mode 100644
index 0000000000..a19686291c
--- /dev/null
+++ b/dom/xbl/builtin/input-fields-base.inc
@@ -0,0 +1,17 @@
+    <handler event="keypress" keycode="VK_LEFT" command="cmd_moveLeft"/>
+    <handler event="keypress" keycode="VK_RIGHT" command="cmd_moveRight"/>
+    <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectLeft"/>
+    <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectRight"/>
+
+    <handler event="keypress" keycode="VK_UP" command="cmd_moveUp"/>
+    <handler event="keypress" keycode="VK_DOWN" command="cmd_moveDown"/>
+    <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectUp"/>
+    <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectDown"/>
+
+    <!-- Cut/copy/paste/undo -->
+    <handler event="keypress" key="c" modifiers="accel" command="cmd_copy"/>
+    <handler event="keypress" key="x" modifiers="accel" command="cmd_cut"/>
+    <handler event="keypress" key="v" modifiers="accel" command="cmd_paste"/>
+    <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+    <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo" />
+
diff --git a/dom/xbl/builtin/mac/jar.mn b/dom/xbl/builtin/mac/jar.mn
new file mode 100644
index 0000000000..9f05c2dd6c
--- /dev/null
+++ b/dom/xbl/builtin/mac/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolkit.jar:
+* content/global/platformHTMLBindings.xml   (platformHTMLBindings.xml)
diff --git a/dom/xbl/builtin/mac/moz.build b/dom/xbl/builtin/mac/moz.build
new file mode 100644
index 0000000000..eb4454d28f
--- /dev/null
+++ b/dom/xbl/builtin/mac/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
\ No newline at end of file
diff --git a/dom/xbl/builtin/mac/platformHTMLBindings.xml b/dom/xbl/builtin/mac/platformHTMLBindings.xml
new file mode 100644
index 0000000000..b705923999
--- /dev/null
+++ b/dom/xbl/builtin/mac/platformHTMLBindings.xml
@@ -0,0 +1,72 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<bindings id="htmlBindings"
+   xmlns="http://www.mozilla.org/xbl"
+   xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+  <binding id="inputFields" bindToUntrustedContent="true">
+    <handlers>
+      <handler event="keypress" key="c" modifiers="accel" command="cmd_copy"/>
+      <handler event="keypress" key="x" modifiers="accel" command="cmd_cut"/>
+      <handler event="keypress" key="v" modifiers="accel" command="cmd_paste"/>
+      <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+      <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo"/>
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+
+  <binding id="textAreas" bindToUntrustedContent="true">
+    <handlers>
+      <handler event="keypress" key="c" modifiers="accel" command="cmd_copy"/>
+      <handler event="keypress" key="x" modifiers="accel" command="cmd_cut"/>
+      <handler event="keypress" key="v" modifiers="accel" command="cmd_paste"/>
+      <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+      <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo"/>
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+
+  <binding id="browser">
+    <handlers>
+#include ../browser-base.inc
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_scrollPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_scrollPageDown"/>
+      <handler event="keypress" keycode="VK_HOME" command="cmd_scrollTop" /> 
+      <handler event="keypress" keycode="VK_END"  command="cmd_scrollBottom" /> 
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="alt" command="cmd_moveLeft2" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="alt" command="cmd_moveRight2" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="alt,shift" command="cmd_selectLeft2" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="alt,shift" command="cmd_selectRight2" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectLeft" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectRight" />
+      <handler event="keypress" keycode="VK_UP" modifiers="alt,shift" command="cmd_selectUp2" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="alt,shift" command="cmd_selectDown2" />
+      <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectUp" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectDown" />
+      <handler event="keypress" keycode="VK_UP" modifiers="accel" command="cmd_moveUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="accel" command="cmd_moveDown2"/>
+    </handlers>
+  </binding>
+
+  <binding id="editor">
+    <handlers>
+      <handler event="keypress" key=" " modifiers="shift" command="cmd_scrollPageUp" />
+      <handler event="keypress" key=" " command="cmd_scrollPageDown" />
+
+      <handler event="keypress" key="z" command="cmd_undo" modifiers="accel"/>
+      <handler event="keypress" key="z" command="cmd_redo" modifiers="accel,shift" />
+      <handler event="keypress" key="x" command="cmd_cut" modifiers="accel"/>
+      <handler event="keypress" key="c" command="cmd_copy" modifiers="accel"/>
+      <handler event="keypress" key="v" command="cmd_paste" modifiers="accel"/>
+      <handler event="keypress" key="v" command="cmd_pasteNoFormatting" modifiers="accel,shift"/>
+      <handler event="keypress" key="a" command="cmd_selectAll" modifiers="accel"/>
+      <handler event="keypress" key="v" command="cmd_pasteNoFormatting" modifiers="accel,alt,shift"/>
+    </handlers>
+  </binding>
+
+</bindings>
diff --git a/dom/xbl/builtin/moz.build b/dom/xbl/builtin/moz.build
new file mode 100644
index 0000000000..09574b363c
--- /dev/null
+++ b/dom/xbl/builtin/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    DIRS += ['win']
+elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
+    DIRS += ['mac']
+elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'android':
+    DIRS += ['android']
+elif CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk2', 'gtk3'):
+    DIRS += ['unix']
+else:
+    DIRS += ['emacs']
+
diff --git a/dom/xbl/builtin/textareas-base.inc b/dom/xbl/builtin/textareas-base.inc
new file mode 100644
index 0000000000..7c52359d70
--- /dev/null
+++ b/dom/xbl/builtin/textareas-base.inc
@@ -0,0 +1,16 @@
+    <handler event="keypress" keycode="VK_LEFT" command="cmd_moveLeft"/>
+    <handler event="keypress" keycode="VK_RIGHT" command="cmd_moveRight"/>
+    <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectLeft"/>
+    <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectRight"/>
+
+    <handler event="keypress" keycode="VK_UP" command="cmd_moveUp"/>
+    <handler event="keypress" keycode="VK_DOWN" command="cmd_moveDown"/>
+    <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectUp"/>
+    <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectDown"/>
+
+    <!-- Cut/copy/paste/undo -->
+    <handler event="keypress" key="c" modifiers="accel" command="cmd_copy"/>
+    <handler event="keypress" key="x" modifiers="accel" command="cmd_cut"/>
+    <handler event="keypress" key="v" modifiers="accel" command="cmd_paste"/>
+    <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+    <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo" />
diff --git a/dom/xbl/builtin/unix/jar.mn b/dom/xbl/builtin/unix/jar.mn
new file mode 100644
index 0000000000..9f05c2dd6c
--- /dev/null
+++ b/dom/xbl/builtin/unix/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolkit.jar:
+* content/global/platformHTMLBindings.xml   (platformHTMLBindings.xml)
diff --git a/dom/xbl/builtin/unix/moz.build b/dom/xbl/builtin/unix/moz.build
new file mode 100644
index 0000000000..eb4454d28f
--- /dev/null
+++ b/dom/xbl/builtin/unix/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
\ No newline at end of file
diff --git a/dom/xbl/builtin/unix/platformHTMLBindings.xml b/dom/xbl/builtin/unix/platformHTMLBindings.xml
new file mode 100644
index 0000000000..75645f1f6a
--- /dev/null
+++ b/dom/xbl/builtin/unix/platformHTMLBindings.xml
@@ -0,0 +1,82 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<bindings id="htmlBindings"
+   xmlns="http://www.mozilla.org/xbl"
+   xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ 
+  <binding id="inputFields" bindToUntrustedContent="true">
+    <handlers>
+#include ../input-fields-base.inc
+    <handler event="keypress" key="a" modifiers="alt"
+        command="cmd_selectAll"/>
+    <handler event="keypress" key="y" modifiers="accel"
+        command="cmd_redo"/>
+    <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo"/>
+    <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+    </handlers>
+  </binding>
+
+  <binding id="textAreas" bindToUntrustedContent="true">
+    <handlers>
+#include ../textareas-base.inc
+    <handler event="keypress" key="a" modifiers="alt"
+        command="cmd_selectAll"/>
+    <handler event="keypress" key="y" modifiers="accel"
+        command="cmd_redo"/>
+    <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+    <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo"/>
+    </handlers>
+  </binding>
+
+  <binding id="browser">
+    <handlers>
+#include ../browser-base.inc
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cut" /> 
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_copy" /> 
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy" /> 
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop" /> 
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom" /> 
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectLeft" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectRight" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_moveLeft2" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_moveRight2" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control,shift" command="cmd_selectLeft2" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control,shift" command="cmd_selectRight2" />
+
+      <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectUp" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectDown" />
+      <handler event="keypress" keycode="VK_UP" modifiers="control" command="cmd_moveUp2" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="control" command="cmd_moveDown2" />
+      <handler event="keypress" keycode="VK_UP" modifiers="control,shift" command="cmd_selectUp2" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="control,shift" command="cmd_selectDown2" />
+
+      <handler event="keypress" key="a" modifiers="alt" command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+
+  <binding id="editor">
+    <handlers>
+#include ../editor-base.inc
+      <handler event="keypress" key="z" modifiers="accel" command="cmd_undo"/>
+      <handler event="keypress" key="z" modifiers="accel,shift" command="cmd_redo"/>
+      <handler event="keypress" key="y" modifiers="accel"   command="cmd_redo"/>
+      <handler event="keypress" key="a" modifiers="alt" command="cmd_selectAll"/>
+    </handlers>
+  </binding>
+</bindings>
diff --git a/dom/xbl/builtin/win/jar.mn b/dom/xbl/builtin/win/jar.mn
new file mode 100644
index 0000000000..9f05c2dd6c
--- /dev/null
+++ b/dom/xbl/builtin/win/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+toolkit.jar:
+* content/global/platformHTMLBindings.xml   (platformHTMLBindings.xml)
diff --git a/dom/xbl/builtin/win/moz.build b/dom/xbl/builtin/win/moz.build
new file mode 100644
index 0000000000..eb4454d28f
--- /dev/null
+++ b/dom/xbl/builtin/win/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
\ No newline at end of file
diff --git a/dom/xbl/builtin/win/platformHTMLBindings.xml b/dom/xbl/builtin/win/platformHTMLBindings.xml
new file mode 100644
index 0000000000..1612138e1d
--- /dev/null
+++ b/dom/xbl/builtin/win/platformHTMLBindings.xml
@@ -0,0 +1,164 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<bindings id="htmlBindings"
+   xmlns="http://www.mozilla.org/xbl"
+   xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ 
+  <binding id="inputFields" bindToUntrustedContent="true">
+    <handlers>
+#include ../input-fields-base.inc
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_moveLeft2"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_moveRight2"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" command="cmd_selectLeft2"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" command="cmd_selectRight2"/>
+
+      <handler event="keypress" keycode="VK_UP" modifiers="control" command="cmd_moveUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="control" command="cmd_moveDown2"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift,control" command="cmd_selectUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift,control" command="cmd_selectDown2"/>
+
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cutOrDelete"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_deleteWordForward"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="shift" command="cmd_paste"/>
+
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_undo"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt,shift" command="cmd_redo"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="control" command="cmd_deleteWordBackward"/>
+
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+      <handler event="keypress" key="y" modifiers="accel" command="cmd_redo"/>
+    </handlers>
+  </binding>
+
+  <binding id="textAreas" bindToUntrustedContent="true">
+    <handlers>
+#include ../textareas-base.inc
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_moveLeft2"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_moveRight2"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,control" command="cmd_selectLeft2"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,control" command="cmd_selectRight2"/>
+
+      <handler event="keypress" keycode="VK_UP" modifiers="control" command="cmd_moveUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="control" command="cmd_moveDown2"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift,control" command="cmd_selectUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift,control" command="cmd_selectDown2"/>
+
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cutOrDelete"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_deleteWordForward"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="shift" command="cmd_paste"/>
+
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_undo"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt,shift" command="cmd_redo"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="control" command="cmd_deleteWordBackward"/>
+
+      <handler event="keypress" key="a" modifiers="accel" command="cmd_selectAll"/>
+      <handler event="keypress" key="y" modifiers="accel" command="cmd_redo"/>
+     </handlers>
+  </binding>
+
+  <binding id="browser">
+    <handlers>
+#include ../browser-base.inc
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cut"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_deleteWordForward"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy"/>
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom" />
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control" command="cmd_moveLeft2" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control" command="cmd_moveRight2" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="control,shift" command="cmd_selectLeft2" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="control,shift" command="cmd_selectRight2" />
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift" command="cmd_selectLeft" />
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift" command="cmd_selectRight" />
+
+      <handler event="keypress" keycode="VK_UP" modifiers="control" command="cmd_moveUp2" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="control" command="cmd_moveDown2" />
+      <handler event="keypress" keycode="VK_UP" modifiers="control,shift" command="cmd_selectUp2" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="control,shift" command="cmd_selectDown2" />
+      <handler event="keypress" keycode="VK_UP" modifiers="shift" command="cmd_selectUp" />
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift" command="cmd_selectDown" />
+
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift" command="cmd_selectBeginLine" />
+      <handler event="keypress" keycode="VK_END" modifiers="shift" command="cmd_selectEndLine" />
+      <handler event="keypress" key="y" modifiers="accel" command="cmd_redo"/>
+    </handlers>
+  </binding>
+
+  <binding id="editor">
+    <handlers>
+#include ../editor-base.inc
+      <handler event="keypress" key="a" command="cmd_selectAll" modifiers="accel"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="shift" command="cmd_cutOrDelete"/>
+      <handler event="keypress" keycode="VK_DELETE" modifiers="control" command="cmd_deleteWordForward"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="control" command="cmd_copy"/>
+      <handler event="keypress" keycode="VK_INSERT" modifiers="shift" command="cmd_paste"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt" command="cmd_undo"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="alt,shift" command="cmd_redo"/>
+
+      <handler event="keypress" keycode="VK_LEFT" modifiers="accel" command="cmd_moveLeft2"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="accel" command="cmd_moveRight2"/>
+      <handler event="keypress" keycode="VK_LEFT" modifiers="shift,accel" command="cmd_selectLeft2"/>
+      <handler event="keypress" keycode="VK_RIGHT" modifiers="shift,accel" command="cmd_selectRight2"/>
+
+      <handler event="keypress" keycode="VK_UP" modifiers="accel" command="cmd_moveUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="accel" command="cmd_moveDown2"/>
+      <handler event="keypress" keycode="VK_UP" modifiers="shift,accel" command="cmd_selectUp2"/>
+      <handler event="keypress" keycode="VK_DOWN" modifiers="shift,accel" command="cmd_selectDown2"/>
+
+      <handler event="keypress" keycode="VK_HOME" modifiers="shift,control" command="cmd_selectTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="shift,control" command="cmd_selectBottom"/>
+      <handler event="keypress" keycode="VK_HOME" modifiers="control" command="cmd_moveTop"/>
+      <handler event="keypress" keycode="VK_END" modifiers="control" command="cmd_moveBottom"/>
+      <handler event="keypress" keycode="VK_BACK" modifiers="control" command="cmd_deleteWordBackward"/>
+
+      <handler event="keypress" keycode="VK_HOME" command="cmd_beginLine"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_endLine"/>
+      <handler event="keypress" keycode="VK_HOME" command="cmd_selectBeginLine" modifiers="shift"/>
+      <handler event="keypress" keycode="VK_END" command="cmd_selectEndLine" modifiers="shift"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" command="cmd_movePageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" command="cmd_movePageDown"/>
+      <handler event="keypress" keycode="VK_PAGE_UP" modifiers="shift" command="cmd_selectPageUp"/>
+      <handler event="keypress" keycode="VK_PAGE_DOWN" modifiers="shift" command="cmd_selectPageDown"/>
+      <handler event="keypress" key="y" modifiers="accel" command="cmd_redo"/>
+    </handlers>
+  </binding>
+</bindings>
diff --git a/dom/xbl/crashtests/205735-1.xhtml b/dom/xbl/crashtests/205735-1.xhtml
new file mode 100644
index 0000000000..bfc42773bc
--- /dev/null
+++ b/dom/xbl/crashtests/205735-1.xhtml
@@ -0,0 +1,27 @@
+<?xml version="1.0"?>

+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

+<html xmlns="http://www.w3.org/1999/xhtml">

+<head>

+<title>Bug 205735</title>

+<xbl:bindings xmlns:xbl="http://www.mozilla.org/xbl" xmlns="http://www.mozilla.org/xbl">

+<binding id="rd">

+<xbl:content xmlns="http://www.w3.org/1999/xhtml" xmlns:xbl="http://www.mozilla.org/xbl"><div><div>binding content<xbl:children/></div></div></xbl:content>

+  <implementation>

+    <constructor>

+    <![CDATA[

+  var x=document.getAnonymousNodes(this)[0];

+  x.removeChild(x.childNodes[0]);

+    ]]>

+    </constructor>  

+  </implementation>

+</binding>

+</xbl:bindings>

+<style type="text/css">

+.chapter{-moz-binding:url(#rd);}

+</style>

+</head>

+<body>

+<div class="chapter">test</div>

+</body>

+</html>

diff --git a/dom/xbl/crashtests/223799-1.xul b/dom/xbl/crashtests/223799-1.xul
new file mode 100644
index 0000000000..455ac9e05f
--- /dev/null
+++ b/dom/xbl/crashtests/223799-1.xul
@@ -0,0 +1,27 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
+<window
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:html="http://www.w3.org/1999/xhtml"
+  >
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="foo">
+      <content><xul:box><xul:box><children/></xul:box></xul:box></content>
+    </binding>
+      <implementation>
+        <field name="box">document.getAnonymousNodes(this)[0]</field>
+      </implementation>
+  </bindings>
+  <html:style type="text/css">
+  <!-- CSS style rules for XBL bindings go here -->
+  <![CDATA[
+foo {
+  -moz-binding: url("#foo");
+}
+  ]]>
+  </html:style>
+  <!-- XUL application goes here -->
+
+  <foo><description>World</description></foo>
+</window>
diff --git a/dom/xbl/crashtests/226744-1.xhtml b/dom/xbl/crashtests/226744-1.xhtml
new file mode 100644
index 0000000000..63915dbe88
--- /dev/null
+++ b/dom/xbl/crashtests/226744-1.xhtml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml"
+    xmlns:html="http://www.w3.org/1999/xhtml"
+    xmlns:xbl="http://www.mozilla.org/xbl">
+
+    <xbl:bindings>
+        <xbl:binding id="rd">
+				<xbl:resources>
+<xbl:stylesheet src="data:text/html;charset=utf-8,"/>
+</xbl:resources>
+            <xbl:content>
+<xbl:children/>
+            </xbl:content>
+        </xbl:binding>
+
+    </xbl:bindings>
+
+    <head>
+        <title>testcase bug ?</title>
+        
+        <style type="text/css">
+        .hoofdstuk {
+            -moz-binding: url(#rd);
+        }
+        </style>
+    </head>
+    
+    <body>    
+<div class="hoofdstuk">test
+</div>
+<div class="hoofdstuk">test
+</div>
+    </body>
+
+</html>
diff --git a/dom/xbl/crashtests/232095-1.xul b/dom/xbl/crashtests/232095-1.xul
new file mode 100644
index 0000000000..bfd5476e6f
--- /dev/null
+++ b/dom/xbl/crashtests/232095-1.xul
@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
+<window
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:xbl="http://www.mozilla.org/xbl"
+  xmlns:html="http://www.w3.org/1999/xhtml"
+  >
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="serverpost_base">
+    <implementation>
+      <method name="getSuccessfulControls">
+        <parameter name="aNode"/>
+        <body><![CDATA[
+          dump("<html:input type="file"/> has not been tested yet!  This may not work!!!\n");
+        ]]></body>
+      </method>
+
+      <method name='finalizeAndSubmit'>
+        <body>
+	  return true;
+        </body>
+      </method>
+    </implementation>
+  </binding>
+</bindings>
+
+  <html:style type="text/css"><![CDATA[
+  @namespace xbl url("http://www.mozilla.org/xbl");
+  @namespace xul url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+  xbl|bindings {
+    display: none;
+  }
+
+  xul|serverpost {
+    -moz-binding: url("#serverpost_base");
+  }
+
+  ]]></html:style>
+
+  <serverpost/>
+  <serverpost/>
+</window>
diff --git a/dom/xbl/crashtests/277523-1.xhtml b/dom/xbl/crashtests/277523-1.xhtml
new file mode 100644
index 0000000000..74dc5d8080
--- /dev/null
+++ b/dom/xbl/crashtests/277523-1.xhtml
@@ -0,0 +1,24 @@
+<?xml version="1.0"?>

+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xbl="http://www.mozilla.org/xbl">

+<head>

+<title>Testcase bug 277208 - appendChild to a hidden box from a binding crashes</title>

+

+<xbl:bindings><xbl:binding id="crash"><xbl:content>

+<span style="display:none"><xbl:children includes="span"/></span>

+</xbl:content></xbl:binding></xbl:bindings>

+

+<style type="text/css">

+#test{-moz-binding:url(#crash);}

+</style>

+</head>

+<body onload="init()">

+<span id="test"></span>

+<script>

+function init(){

+         document.getElementById('test').appendChild(document.createElement('span'));

+}

+</script>

+</body>

+</html>

diff --git a/dom/xbl/crashtests/277950-1.xhtml b/dom/xbl/crashtests/277950-1.xhtml
new file mode 100644
index 0000000000..eae6f1574b
--- /dev/null
+++ b/dom/xbl/crashtests/277950-1.xhtml
@@ -0,0 +1,20 @@
+<?xml version="1.0"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>Testcase</title>
+<xbl:bindings xmlns="http://www.mozilla.org/xbl"
+  xmlns:xbl="http://www.mozilla.org/xbl">
+  <binding id="test">
+    <implementation>
+      <property/>
+    </implementation>
+  </binding>
+</xbl:bindings>
+<style type="text/css">
+  p{ -moz-binding: url(#test); }
+</style>
+</head>
+<body>
+<p></p>
+</body>
+</html>
diff --git a/dom/xbl/crashtests/336744-1-inner.html b/dom/xbl/crashtests/336744-1-inner.html
new file mode 100644
index 0000000000..4af1fbd52c
--- /dev/null
+++ b/dom/xbl/crashtests/336744-1-inner.html
@@ -0,0 +1,6 @@
+<html><head>
+<title>Testcase bug 336744 - Crash when window gets destroyed during popuphiding event</title>
+</head><body>
+This should not crash Mozilla within 1 second<br>
+<iframe src="data:application/vnd.mozilla.xul+xml;charset=utf-8,%3C%3Fxml%20version%3D%221.0%22%3F%3E%0A%3C%3Fxml-stylesheet%20href%3D%22chrome%3A//global/skin%22%20type%3D%22text/css%22%3F%3E%0A%0A%3Cwindow%20xmlns%3Ahtml%3D%22http%3A//www.w3.org/1999/xhtml%22%0A%20%20%20%20%20%20%20%20xmlns%3D%22http%3A//www.mozilla.org/keymaster/gatekeeper/there.is.only.xul%22%3E%0A%3Chtml%3Ascript%3E%0Adocument.addEventListener%28%22popuphiding%22%2C%20doe%2C%20true%29%3B%0Afunction%20doe%28e%29%20%7B%0Avar%20x%3D%20parent.document.getElementsByTagName%28%27iframe%27%29%5B0%5D%3B%0Ax.parentNode.removeChild%28x%29%3B%0A%7D%0AsetTimeout%28function%28%29%20%7B%20document.getElementsByTagName%28%22menupopup%22%29%5B0%5D.showPopup%28%29%3B%20%7D%2C%20800%29%3B%0AsetTimeout%28function%28%29%20%7B%20document.getElementsByTagName%28%22menupopup%22%29%5B0%5D.hidePopup%28%29%3B%20%7D%2C%201000%29%3B%0A%3C/html%3Ascript%3E%0A%3Cscript%3E%0A%0A%3C/script%3E%0A%3Cmenupopup%3E%0A%20%20%3Cmenuitem%20label%3D%22One%22/%3E%0A%3C/menupopup%3E%0A%3C/window%3E%0A"></iframe>
+</body></html>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/336744-1.html b/dom/xbl/crashtests/336744-1.html
new file mode 100644
index 0000000000..48d5c17010
--- /dev/null
+++ b/dom/xbl/crashtests/336744-1.html
@@ -0,0 +1,9 @@
+<html class="reftest-wait">
+<head>
+<script>
+setTimeout('document.documentElement.className = ""', 1000);
+</script>
+<body>
+<iframe src="336744-1-inner.html"></iframe>
+</body>
+</html>
diff --git a/dom/xbl/crashtests/336960-1-inner.xhtml b/dom/xbl/crashtests/336960-1-inner.xhtml
new file mode 100644
index 0000000000..2064f89779
--- /dev/null
+++ b/dom/xbl/crashtests/336960-1-inner.xhtml
@@ -0,0 +1,29 @@
+<html xmlns="http://www.w3.org/1999/xhtml">

+<head>

+  <script>

+    var x=document.createElementNS('http://www.w3.org/1999/xhtml','style');

+    document.documentElement.appendChild(x);

+    function doe(){

+      var y=document.getElementsByTagName('style')[0];

+    }

+    setTimeout(doe,500);

+  </script>

+

+  <style>

+  style {-moz-binding:url(#randomxbl);}

+  </style>

+

+  <bindings xmlns="http://www.mozilla.org/xbl">

+    <binding id="randomxbl">

+      <implementation>

+        <constructor>

+          var x= parent.document.getElementsByTagName('iframe')[0];

+x.parentNode.removeChild(x);

+        </constructor>

+      </implementation>

+    </binding>

+  </bindings>

+</head>

+<body>

+</body>

+</html>

diff --git a/dom/xbl/crashtests/336960-1.html b/dom/xbl/crashtests/336960-1.html
new file mode 100644
index 0000000000..0263d30958
--- /dev/null
+++ b/dom/xbl/crashtests/336960-1.html
@@ -0,0 +1,13 @@
+<html class="reftest-wait">

+<head>

+

+<title>Testcase bug 336960 - Crash when window gets destroyed when constructor of xbl is running</title>

+<script>

+setTimeout('document.documentElement.className = ""', 500);

+</script>

+</head><body>

+This page should not crash Mozilla, you should see no iframe<br>

+<iframe src="./336960-1-inner.xhtml"></iframe>

+

+</body>

+</html>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/342954-1.xhtml b/dom/xbl/crashtests/342954-1.xhtml
new file mode 100644
index 0000000000..dbaa153840
--- /dev/null
+++ b/dom/xbl/crashtests/342954-1.xhtml
@@ -0,0 +1,46 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xbl="http://www.mozilla.org/xbl">
+
+
+<head>
+
+<script>
+<![CDATA[
+
+function boo()
+{
+  s1 = document.getElementById("s1");  
+  marq = document.getElementById("marq");
+  marqAnonymousSomething = document.getAnonymousNodes(marq)[0].childNodes[0];
+
+  removeNode(marqAnonymousSomething);
+  s1.appendChild(document.createElement("div"));
+}
+
+function removeNode(q1) { q1.parentNode.removeChild(q1); }
+
+]]>
+</script>
+
+<xbl:bindings id="marqueeBindings">
+  <xbl:binding id="marquee-horizontal-12">
+    <xbl:content>
+      <div>
+        <xbl:children/>
+      </div>
+    </xbl:content>
+  </xbl:binding>
+</xbl:bindings>
+
+</head>
+
+
+<body onload="boo()">
+
+<span id="s1">Span</span>
+
+<div id="marq" style="-moz-binding: url('#marquee-horizontal-12');">Marquee</div>
+
+</body>
+
+
+</html>
diff --git a/dom/xbl/crashtests/342954-2-xbl.xml b/dom/xbl/crashtests/342954-2-xbl.xml
new file mode 100644
index 0000000000..3e73f1355a
--- /dev/null
+++ b/dom/xbl/crashtests/342954-2-xbl.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+
+<bindings id="marqueeBindings"
+          xmlns="http://www.mozilla.org/xbl"
+          xmlns:html="http://www.w3.org/1999/xhtml"
+          xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+          xmlns:xbl="http://www.mozilla.org/xbl">
+
+  <binding id="marquee-horizontal-10">
+
+    <content>
+      <html:div>
+        <children/>
+      </html:div>
+    </content>
+
+  </binding>
+
+</bindings>
diff --git a/dom/xbl/crashtests/342954-2.xhtml b/dom/xbl/crashtests/342954-2.xhtml
new file mode 100644
index 0000000000..4a250e31c2
--- /dev/null
+++ b/dom/xbl/crashtests/342954-2.xhtml
@@ -0,0 +1,29 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<script>
+<![CDATA[
+
+function boo()
+{
+  s1 = document.getElementById("s1");  
+  marq = document.getElementById("marq");
+  marqAnonymousSomething = document.getAnonymousNodes(marq)[0].childNodes[0];
+
+  removeNode(marqAnonymousSomething);
+  s1.appendChild(document.createElement("div"));
+}
+
+function removeNode(q1) { q1.parentNode.removeChild(q1); }
+
+]]>
+</script>
+</head>
+
+<body onload="boo()">
+
+<span id="s1">Span</span>
+
+<div id="marq" style="-moz-binding: url('342954-2-xbl.xml#marquee-horizontal-10');">Marquee</div>
+
+</body>
+</html>
diff --git a/dom/xbl/crashtests/368276-1.xhtml b/dom/xbl/crashtests/368276-1.xhtml
new file mode 100644
index 0000000000..162494b2cd
--- /dev/null
+++ b/dom/xbl/crashtests/368276-1.xhtml
@@ -0,0 +1,33 @@
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+      class="reftest-wait">
+
+<head>
+<script>
+
+function boom()
+{
+  var quote = document.getElementById("quote");
+  var para = document.getElementById("para");
+  var dialog = document.getElementById("dialog");
+  var e = document.getElementById("e");
+
+  dialog.appendChild(quote);
+  e.insertBefore(quote, para);
+  
+  document.documentElement.removeAttribute("class");
+}
+
+</script>
+</head>
+
+<body onload="setTimeout(boom, 30)">
+
+<p>He said <q id="quote">J<xul:hbox/></q></p>
+
+<xul:dialog id="dialog"/>
+
+<div id="e"><p id="para">Foopy</p></div>
+
+</body>
+</html>
diff --git a/dom/xbl/crashtests/368641-1.xhtml b/dom/xbl/crashtests/368641-1.xhtml
new file mode 100644
index 0000000000..0b42ac8138
--- /dev/null
+++ b/dom/xbl/crashtests/368641-1.xhtml
@@ -0,0 +1,22 @@
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+<head>
+<script>
+
+function boom()
+{
+  var yaz = document.getElementById("yaz");
+
+  document.body.appendChild(yaz);
+}
+
+</script>
+</head>
+
+<body onload="boom()">
+  
+  <xul:tabs><span id="yaz"><xul:hbox><xul:popup/><xul:template/></xul:hbox></span></xul:tabs>
+</body>
+
+</html>
diff --git a/dom/xbl/crashtests/378521-1.xhtml b/dom/xbl/crashtests/378521-1.xhtml
new file mode 100644
index 0000000000..3db89d49a0
--- /dev/null
+++ b/dom/xbl/crashtests/378521-1.xhtml
@@ -0,0 +1,18 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml">
+<head>
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="foo" extends="html:input">
+    <content>
+      Foo?
+      <children/>
+    </content>
+  </binding>
+</bindings>
+</head>
+
+<body>
+<div>Hi!</div>
+<div style="-moz-binding: url(#foo)">XXX</div>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/382376-1.xhtml b/dom/xbl/crashtests/382376-1.xhtml
new file mode 100644
index 0000000000..55457f79e2
--- /dev/null
+++ b/dom/xbl/crashtests/382376-1.xhtml
@@ -0,0 +1,37 @@
+<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">

+<head>

+<script>

+

+function boom1()

+{

+  var c = document.getElementById("c");

+  c.style.MozBinding = "url('#foo')";

+  

+  setTimeout(boom2, 30);

+}

+

+function boom2()

+{

+  var v = document.getElementById("v");

+  v.parentNode.removeChild(v);

+  document.documentElement.removeAttribute("class");

+}

+

+</script>

+

+<bindings xmlns="http://www.mozilla.org/xbl"><binding id="foo">

+  <content>x x x x x <children/></content>

+</binding></bindings>

+

+</head>

+

+<body style="font-family: monospace; width: 10ch;" onload="setTimeout(boom1, 30);">

+

+<div style="background: lightblue; border: 1px solid blue; margin-bottom: 1em;">

+  <span id="c">y y<span id="v">Z<div/></span></span>

+</div>

+

+<div style="background: lightgreen; border: 1px solid green; height: 2000px;">s</div>

+

+</body>

+</html>

diff --git a/dom/xbl/crashtests/382376-2.xhtml b/dom/xbl/crashtests/382376-2.xhtml
new file mode 100644
index 0000000000..4e22b8f4ea
--- /dev/null
+++ b/dom/xbl/crashtests/382376-2.xhtml
@@ -0,0 +1,27 @@
+<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
+<head>
+<script>
+
+function boom()
+{
+  var v = document.getElementById("v");
+  v.parentNode.removeChild(v);
+  document.documentElement.removeAttribute("class");
+}
+
+</script>
+
+<bindings xmlns="http://www.mozilla.org/xbl"><binding id="foo">
+  <content>x x x x x <children/></content>
+</binding></bindings>
+
+</head>
+
+<body onload="setTimeout(boom, 30);">
+
+<div style="background: lightblue; border: 1px solid blue; width: 300px">
+  <span style="-moz-binding: url(#foo);" >y y<span id="v">Z<div/></span></span>
+</div>
+
+</body>
+</html>
diff --git a/dom/xbl/crashtests/397596-1.xhtml b/dom/xbl/crashtests/397596-1.xhtml
new file mode 100644
index 0000000000..c7b562b52d
--- /dev/null
+++ b/dom/xbl/crashtests/397596-1.xhtml
@@ -0,0 +1,29 @@
+<html xmlns="http://www.w3.org/1999/xhtml">

+<head>

+<title>Testcase bug - 100% cpu usage with binding setting position: fixed in constructor</title>

+

+<bindings xmlns="http://www.mozilla.org/xbl">

+<binding id="b" inheritstyle="false">

+<content>

+<div xmlns="http://www.w3.org/1999/xhtml" style=" -moz-binding: url(#a);"/>

+<children/>

+</content>

+</binding>

+

+<binding id="a">

+<implementation>

+<constructor>

+  this.style.position='fixed';

+</constructor>

+</implementation>

+<content>

+<children xmlns="http://www.mozilla.org/xbl"/>

+</content>

+</binding>

+</bindings>

+

+</head>

+<body>

+<span style="-moz-binding:url();"></span>

+</body>

+</html>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/404125-1.xhtml b/dom/xbl/crashtests/404125-1.xhtml
new file mode 100644
index 0000000000..46b0fd6f8d
--- /dev/null
+++ b/dom/xbl/crashtests/404125-1.xhtml
@@ -0,0 +1,29 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="lc">
+    <content>
+      <xul:listcell> t <children/></xul:listcell>
+    </content>
+  </binding>
+</bindings>
+
+<script>
+function boom()
+{
+  var hbox = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "hbox");
+  document.getElementById("vv").appendChild(hbox);
+}
+</script>
+
+</head>
+
+<body onload="boom();">
+
+<div style="-moz-binding: url(#lc);" id="vv"></div>
+
+</body>
+
+</html>
diff --git a/dom/xbl/crashtests/406900-1.xul b/dom/xbl/crashtests/406900-1.xul
new file mode 100644
index 0000000000..3b3dc1f870
--- /dev/null
+++ b/dom/xbl/crashtests/406900-1.xul
@@ -0,0 +1,33 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="boom();">
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="lit">
+    <content>
+      <children>
+        <xul:hbox/>
+      </children>
+    </content>
+  </binding>
+</bindings>
+
+<script type="text/javascript"> 
+
+function boom()
+{
+  var x = document.getElementById("x");
+  var anon = document.getAnonymousNodes(x)[0];
+  document.documentElement.removeChild(x);
+  document.documentElement.appendChild(x);
+  var hbox = document.createElement('hbox');
+  anon.appendChild(hbox);
+}
+
+</script>
+
+<hbox id="x" style="-moz-binding: url(#lit)" />
+
+</window>
diff --git a/dom/xbl/crashtests/406904-1.xhtml b/dom/xbl/crashtests/406904-1.xhtml
new file mode 100644
index 0000000000..758fb04cd8
--- /dev/null
+++ b/dom/xbl/crashtests/406904-1.xhtml
@@ -0,0 +1,25 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xbl="http://www.mozilla.org/xbl">
+<head>
+
+<xbl:bindings xmlns="http://www.mozilla.org/xbl"><xbl:binding id="a"><xbl:content>
+<span>foo<xbl:children/></span>
+</xbl:content></xbl:binding></xbl:bindings>
+
+<script type="text/javascript">
+
+function boom()
+{
+  var s = document.getElementById("s");
+  var anon = document.getAnonymousNodes(s)[0];
+
+  while (anon.firstChild)
+    anon.removeChild(anon.firstChild);
+
+  document.documentElement.style.MozBinding = "url('data:text/xml,%3Cbindings%20xmlns%3D%22http%3A%2F%2Fwww.mozilla.org%2Fxbl%22%3E%3Cbinding%20id%3D%22foo%22%3E%3Ccontent%3EQ%3C%2Fcontent%3E%3C%2Fbinding%3E%3C%2Fbindings%3E%0A')";
+}
+
+</script>
+</head>
+
+<body onload="boom();"><span id="s" style="-moz-binding: url('#a');"></span></body>
+</html>
diff --git a/dom/xbl/crashtests/406904-2.xhtml b/dom/xbl/crashtests/406904-2.xhtml
new file mode 100644
index 0000000000..763672b3f6
--- /dev/null
+++ b/dom/xbl/crashtests/406904-2.xhtml
@@ -0,0 +1,25 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xbl="http://www.mozilla.org/xbl">
+<head>
+
+<xbl:bindings xmlns="http://www.mozilla.org/xbl"><xbl:binding id="a"><xbl:content>
+<span><span></span><xbl:children/></span>
+</xbl:content></xbl:binding></xbl:bindings>
+
+<script type="text/javascript">
+
+function boom()
+{
+  var s = document.getElementById("s");
+  var anon = document.getAnonymousNodes(s)[0];
+
+  while (anon.firstChild)
+    anon.removeChild(anon.firstChild);
+
+  document.documentElement.style.MozBinding = "url('data:text/xml,%3Cbindings%20xmlns%3D%22http%3A%2F%2Fwww.mozilla.org%2Fxbl%22%3E%3Cbinding%20id%3D%22foo%22%3E%3Ccontent%3EQ%3C%2Fcontent%3E%3C%2Fbinding%3E%3C%2Fbindings%3E%0A')";
+}
+
+</script>
+</head>
+
+<body onload="boom();"><span id="s" style="-moz-binding: url('#a');"></span></body>
+</html>
diff --git a/dom/xbl/crashtests/415192-1.xul b/dom/xbl/crashtests/415192-1.xul
new file mode 100644
index 0000000000..3795ca2205
--- /dev/null
+++ b/dom/xbl/crashtests/415192-1.xul
@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin/global.css"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="boom();">
+<script type="text/javascript">
+
+function boom()
+{
+  var XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+  var wizard = document.createElementNS(XUL_NS, "wizard");
+  var space = document.createTextNode(" ");
+  var hbox = document.createElementNS(XUL_NS, "hbox");
+  hbox.setAttribute("anonid", "Buttons");
+
+  document.documentElement.appendChild(wizard);
+  wizard.appendChild(space);
+  wizard.appendChild(hbox);
+  wizard.cloneNode(true);
+}
+
+</script>
+</window>
diff --git a/dom/xbl/crashtests/415301-1.xul b/dom/xbl/crashtests/415301-1.xul
new file mode 100644
index 0000000000..cee274fcd3
--- /dev/null
+++ b/dom/xbl/crashtests/415301-1.xul
@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin/global.css"?>
+
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="boom();">
+
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+
+<binding id="chil"><content><children/></content></binding>
+
+<binding id="ichil"><content>
+<xul:hbox style="-moz-binding: url(#chil)"><children/></xul:hbox>
+</content></binding>
+
+</bindings>
+
+
+<script type="text/javascript">
+
+function boom()
+{
+  document.getElementById("inner").removeChild(document.getElementById("lbb"));
+  document.getElementById("outer").style.MozBinding = "";
+}
+
+</script>
+
+
+<hbox id="outer" style="-moz-binding: url(#chil)"><hbox id="inner" style="-moz-binding: url(#ichil)"><listboxbody id="lbb" /></hbox></hbox>
+
+
+</window>
diff --git a/dom/xbl/crashtests/418133-1.xhtml b/dom/xbl/crashtests/418133-1.xhtml
new file mode 100644
index 0000000000..ea821b76ed
--- /dev/null
+++ b/dom/xbl/crashtests/418133-1.xhtml
@@ -0,0 +1,22 @@
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+<head>
+<script type="text/javascript">
+
+function boom()
+{
+  for(var p in document.getElementById("prefs")) {
+  }
+  
+  for(var p in window) {
+  }
+}
+
+</script>
+</head>
+<body onload="boom();">
+
+<xul:preferences id="prefs" />
+
+</body>
+</html>
diff --git a/dom/xbl/crashtests/420233-1.xhtml b/dom/xbl/crashtests/420233-1.xhtml
new file mode 100644
index 0000000000..8ec4250753
--- /dev/null
+++ b/dom/xbl/crashtests/420233-1.xhtml
@@ -0,0 +1,21 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml">
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="ab"><content><html:span>a b<children/></html:span></content></binding>
+  <binding id="empty"><content></content></binding>
+</bindings>
+
+<script type="text/javascript">
+
+function boom()
+{
+  document.getElementById("td").style.MozBinding = "url('#empty')";
+}
+
+</script>
+
+</head>
+
+<body onload="boom();"><div style="width: 1px;"><span style="-moz-binding: url(#ab);"><td id="td"/></span></div></body>
+</html>
diff --git a/dom/xbl/crashtests/421997-1.xhtml b/dom/xbl/crashtests/421997-1.xhtml
new file mode 100644
index 0000000000..4b91f00fcc
--- /dev/null
+++ b/dom/xbl/crashtests/421997-1.xhtml
@@ -0,0 +1,27 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="g">
+    <implementation>
+      <constructor>
+        throw 3;
+      </constructor>
+    </implementation>
+  </binding>
+</bindings>
+
+<script type="text/javascript">
+
+function e()
+{
+  var listboxbody = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "listboxbody");
+  document.getElementById("s").appendChild(listboxbody);
+}
+
+</script>
+</head>
+
+<body onerror="e();"><span id="s" style="-moz-binding: url(#g)"></span></body>
+
+</html>
diff --git a/dom/xbl/crashtests/432813-1-xbl.xml b/dom/xbl/crashtests/432813-1-xbl.xml
new file mode 100644
index 0000000000..b2940e638a
--- /dev/null
+++ b/dom/xbl/crashtests/432813-1-xbl.xml
@@ -0,0 +1,7 @@
+<bindings xmlns="http://www.mozilla.org/xbl">
+<binding id="a">
+<content>
+<div xmlns="http://www.w3.org/1999/xhtml" style="-moz-binding: inherit;"/>
+</content>
+</binding>
+</bindings>
diff --git a/dom/xbl/crashtests/432813-1.xhtml b/dom/xbl/crashtests/432813-1.xhtml
new file mode 100644
index 0000000000..586ac05f10
--- /dev/null
+++ b/dom/xbl/crashtests/432813-1.xhtml
@@ -0,0 +1,3 @@
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <box style="-moz-binding:url(432813-1-xbl.xml);"/>
+</window>
diff --git a/dom/xbl/crashtests/454820-1.html b/dom/xbl/crashtests/454820-1.html
new file mode 100644
index 0000000000..31a8316f62
--- /dev/null
+++ b/dom/xbl/crashtests/454820-1.html
@@ -0,0 +1,17 @@
+<!DOCTYPE HTML>
+<html><head>
+    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+    <title>Testcase for bug 454820</title>
+</head>
+<body>
+
+<p>PASS if Firefox does not crash.</p>
+<script type="text/javascript">
+var evObj = document.createEvent('UIEvents');
+evObj.initUIEvent( 'keypress', true, true, window, 1 );
+document.getElementsByTagName('p')[0].dispatchEvent(evObj);
+</script>
+
+
+</body>
+</html>
diff --git a/dom/xbl/crashtests/460665-1.xhtml b/dom/xbl/crashtests/460665-1.xhtml
new file mode 100644
index 0000000000..2ea1f7212b
--- /dev/null
+++ b/dom/xbl/crashtests/460665-1.xhtml
@@ -0,0 +1,28 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="a">
+    <content></content>
+    <implementation>
+      <field>t</field>
+      <field/>
+      <property/>
+      <property>
+        <getter>x</getter>
+        <setter>y</setter>
+      </property>
+      <method/>
+      <method>
+        <body/>
+      </method>
+      <method>
+        <body>a</body>
+      </method>
+    </implementation>
+  </binding>
+</bindings>
+</head>
+
+<body><span id="s" style="-moz-binding: url('#a');"></span></body>
+</html>
diff --git a/dom/xbl/crashtests/463511-1.xhtml b/dom/xbl/crashtests/463511-1.xhtml
new file mode 100644
index 0000000000..a9fec3b509
--- /dev/null
+++ b/dom/xbl/crashtests/463511-1.xhtml
@@ -0,0 +1,9 @@
+<html xmlns="http://www.w3.org/1999/xhtml" style="-moz-binding: url(#foo)">
+<head>
+<bindings xmlns="http://www.mozilla.org/xbl">
+<binding id="foo"><content><listcell xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"><children xmlns="http://www.mozilla.org/xbl"/></listcell></content></binding>
+</bindings>
+</head>
+
+<body onload="document.documentElement.innerHTML = 'x';"></body>
+</html>
diff --git a/dom/xbl/crashtests/464863-1.xhtml b/dom/xbl/crashtests/464863-1.xhtml
new file mode 100644
index 0000000000..a665afc9c2
--- /dev/null
+++ b/dom/xbl/crashtests/464863-1.xhtml
@@ -0,0 +1,22 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl"><binding id="foo"><content><qqq><children xmlns="http://www.mozilla.org/xbl"/></qqq></content></binding></bindings>
+
+<script type="text/javascript">
+// <![CDATA[
+
+function boom()
+{
+  var s = document.getElementById("s");
+  var o = document.getAnonymousNodes(s)[0];
+  (document.body).appendChild(s);
+  o.appendChild(document.createTextNode("F"));
+}
+
+// ]]>
+</script>
+</head>
+
+<body onload="boom();"><span id="s" style="-moz-binding: url(#foo)"></span></body>
+</html>
diff --git a/dom/xbl/crashtests/472260-1.xhtml b/dom/xbl/crashtests/472260-1.xhtml
new file mode 100644
index 0000000000..49d5407d46
--- /dev/null
+++ b/dom/xbl/crashtests/472260-1.xhtml
@@ -0,0 +1,35 @@
+<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="foo"><content><span xmlns="http://www.w3.org/1999/xhtml"/></content></binding>
+  <binding id="bar"><content></content></binding>
+</bindings>
+
+<script type="text/javascript">
+// <![CDATA[
+
+function boom()
+{
+  var bo = document.getElementById("bo");
+  var anon = SpecialPowers.wrap(document).getAnonymousNodes(bo)[0];
+
+  bo.style.MozBinding = "url(#bar)";
+
+  var fr = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
+  fr.setAttribute("src", "javascript:void 0;"); 
+  anon.appendChild(fr);
+  
+  document.documentElement.removeAttribute("class");
+}
+
+]]>
+</script>
+</head>
+
+<body onload="setTimeout(boom, 100);">
+
+<span style="-moz-binding: url(#foo)" id="bo"></span>
+
+</body>
+</html>
diff --git a/dom/xbl/crashtests/477878-1.html b/dom/xbl/crashtests/477878-1.html
new file mode 100644
index 0000000000..17e4002b49
--- /dev/null
+++ b/dom/xbl/crashtests/477878-1.html
@@ -0,0 +1,4 @@
+<html>
+<head></head>
+<body><iframe style="display:none" src="data:text/html,<marquee>Marquee</marquee>" onload="this.style.display = '';"></iframe></body>
+</html>
diff --git a/dom/xbl/crashtests/492978-1.xul b/dom/xbl/crashtests/492978-1.xul
new file mode 100644
index 0000000000..365ecfc9ec
--- /dev/null
+++ b/dom/xbl/crashtests/492978-1.xul
@@ -0,0 +1,15 @@
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" xmlns:html="http://www.w3.org/1999/xhtml">

+

+<bindings xmlns="http://www.mozilla.org/xbl">

+<binding id="a" inheritstyle="false">

+<content>
+<style xmlns="http://www.w3.org/1999/xhtml">

+window::after, box::after, bindings::after { content:"m"; float:right;}

+</style>
+</content>

+</binding>
+</bindings>

+
+<box style="-moz-binding:url(crash1.xul);overflow: scroll;"/>

+

+</window>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/493123-1.xhtml b/dom/xbl/crashtests/493123-1.xhtml
new file mode 100644
index 0000000000..1c568ae15b
--- /dev/null
+++ b/dom/xbl/crashtests/493123-1.xhtml
@@ -0,0 +1,34 @@
+<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
+<head>
+
+<bindings xmlns="http://www.mozilla.org/xbl">
+  <binding id="a"><content></content></binding>
+  <binding id="b"><content><style xmlns="http://www.w3.org/1999/xhtml" style="display: none;">* { overflow: hidden; }</style><children xmlns="http://www.mozilla.org/xbl"/></content></binding>
+</bindings>
+
+<script type="text/javascript" style="display: none">
+
+function one()
+{
+  while (document.documentElement.firstChild) document.documentElement.removeChild(document.documentElement.firstChild)
+  document.documentElement.style.MozBinding = 'url("#a")';
+  setTimeout(two, 1);
+}
+
+function two()
+{
+  document.documentElement.style.MozBinding = 'url("#b")';
+  setTimeout(three, 1);
+}
+
+function three()
+{
+  document.documentElement.style.MozBinding = 'url("#a")';
+  document.documentElement.removeAttribute("class");
+}
+
+</script>
+</head>
+
+<body onload="one();"></body>
+</html>
diff --git a/dom/xbl/crashtests/495354-1.xhtml b/dom/xbl/crashtests/495354-1.xhtml
new file mode 100644
index 0000000000..2e76fb8462
--- /dev/null
+++ b/dom/xbl/crashtests/495354-1.xhtml
@@ -0,0 +1,8 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<bindings xmlns="http://www.mozilla.org/xbl"><binding id="x"><content><caption xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"><children xmlns="http://www.mozilla.org/xbl"/></caption></content></binding></bindings>
+</head>
+<body onload="document.getElementById('x').innerHTML = '9';">
+<span id="x" style="-moz-binding: url(#x)"><div></div></span>
+</body>
+</html>
diff --git a/dom/xbl/crashtests/507628-1.xhtml b/dom/xbl/crashtests/507628-1.xhtml
new file mode 100644
index 0000000000..a82871f718
--- /dev/null
+++ b/dom/xbl/crashtests/507628-1.xhtml
@@ -0,0 +1,12 @@
+<html xmlns="http://www.w3.org/1999/xhtml">

+<bindings xmlns="http://www.mozilla.org/xbl">

+<binding id="b" inheritstyle="false">

+<content>

+<span xmlns="http://www.w3.org/1999/xhtml"/><span xmlns="http://www.w3.org/1999/xhtml"><embed style="display: block;" type="*"/></span>

+</content>

+</binding>

+</bindings>

+

+<div style="-moz-binding:url();"/>
+
+</html>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/507991-1.xhtml b/dom/xbl/crashtests/507991-1.xhtml
new file mode 100644
index 0000000000..402e680eec
--- /dev/null
+++ b/dom/xbl/crashtests/507991-1.xhtml
@@ -0,0 +1,18 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+<head>

+<title>Crash [@ nsSprocketLayout::PopulateBoxSizes] with object and position:absolute;overflow:scroll in binding</title>

+<bindings xmlns="http://www.mozilla.org/xbl">

+<binding id="a" inheritstyle="false">

+<content>

+<object xmlns="http://www.w3.org/1999/xhtml" style="display: table;"/>

+<div xmlns="http://www.w3.org/1999/xhtml" style="position: absolute;overflow: scroll; "/>

+</content>

+</binding>

+</bindings>

+</head>
+
+<body>

+<span style="-moz-binding:url()"></span>

+</body>

+</html>
\ No newline at end of file
diff --git a/dom/xbl/crashtests/830614-1.xul b/dom/xbl/crashtests/830614-1.xul
new file mode 100644
index 0000000000..f2f9bb352a
--- /dev/null
+++ b/dom/xbl/crashtests/830614-1.xul
@@ -0,0 +1,24 @@
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="document.getElementById('trigger');">
+  <box style="display: none">
+    <bindings xmlns="http://www.mozilla.org/xbl">
+      <binding id="crash">
+        <implementation>
+          <constructor>
+            // Fetch it
+            var obj = this.getElementsByTagName("box")[0];
+            // And make it preserve its wrapper.  Note that this will happen
+            // while we're wrapping our box as the parent for id="trigger",
+            // so then we'll unwind and things will be bad.
+            if (obj) obj.expando = 5;
+          </constructor>
+        </implementation>
+      </binding>
+    </bindings>
+    <box style="-moz-binding:url(#crash);">
+      <box id="trigger"/>
+    </box>
+  </box>
+  <!-- Make sure we load our XBL before we try to run our test -->
+  <box style="-moz-binding:url(#crash);"/>
+</window>
diff --git a/dom/xbl/crashtests/895805-1.xhtml b/dom/xbl/crashtests/895805-1.xhtml
new file mode 100644
index 0000000000..a6598de9c6
--- /dev/null
+++ b/dom/xbl/crashtests/895805-1.xhtml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:xbl="http://www.mozilla.org/xbl">
+<head>
+<title>Bug 895805 - Adopting bound element to another document.</title>
+<xbl:bindings>
+  <xbl:binding id="crash">
+    <xbl:content>
+      <xbl:children />
+      Bug 895805 dummy binding
+    </xbl:content>
+  </xbl:binding>
+</xbl:bindings>
+<style type="text/css">
+#test {
+  -moz-binding:url(#crash);
+}
+</style>
+</head>
+<body onload="init()">
+<span id="test">Test</span>
+<script>
+function init() {
+  var boundElement = document.getElementById('test');
+  var otherDoc = document.implementation.createDocument('', '', null);
+  otherDoc.adoptNode(boundElement);
+}
+</script>
+</body>
+</html>
diff --git a/dom/xbl/crashtests/crashtests.list b/dom/xbl/crashtests/crashtests.list
new file mode 100644
index 0000000000..26424c7d85
--- /dev/null
+++ b/dom/xbl/crashtests/crashtests.list
@@ -0,0 +1,40 @@
+load 205735-1.xhtml
+load 223799-1.xul
+load 226744-1.xhtml
+load 232095-1.xul
+load 277523-1.xhtml
+load 277950-1.xhtml
+skip-if(Android) load 336744-1.html # bug 1268050
+load 336960-1.html
+load 342954-1.xhtml
+load 342954-2.xhtml
+load 368276-1.xhtml
+load 368641-1.xhtml
+load 378521-1.xhtml
+load 382376-1.xhtml
+load 382376-2.xhtml
+load 397596-1.xhtml
+load 404125-1.xhtml
+load 406900-1.xul
+load 406904-1.xhtml
+load 406904-2.xhtml
+load 415192-1.xul
+load 415301-1.xul
+load 418133-1.xhtml
+load 420233-1.xhtml
+load 421997-1.xhtml
+load 432813-1.xhtml
+load 454820-1.html
+load 460665-1.xhtml
+load 463511-1.xhtml
+load 464863-1.xhtml
+load 472260-1.xhtml
+load 477878-1.html
+load 492978-1.xul
+load 493123-1.xhtml
+load 495354-1.xhtml
+load 507628-1.xhtml
+load 507991-1.xhtml
+load 830614-1.xul
+load 895805-1.xhtml
+load set-field-bad-this.xhtml
diff --git a/dom/xbl/crashtests/set-field-bad-this.xhtml b/dom/xbl/crashtests/set-field-bad-this.xhtml
new file mode 100644
index 0000000000..7b3dea03a4
--- /dev/null
+++ b/dom/xbl/crashtests/set-field-bad-this.xhtml
@@ -0,0 +1,31 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+<head>
+  <title>Gracefully handle setting a field on a bad |this|</title>
+
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="a">
+      <implementation>
+        <field name="f">17</field>
+      </implementation>
+    </binding>
+  </bindings>
+
+  <script type="application/javascript">
+    window.onload = function()
+    {
+      var bound = document.getElementById("bound");
+      try
+      {
+        Object.getPrototypeOf(bound).f = 42;
+      }
+      catch (e) { /* Throwing's fine, crashing isn't. */ }
+    };
+  </script>
+</head>
+
+<body>
+  <div id="bound" style="-moz-binding: url(#a)"></div>
+</body>
+
+</html>
diff --git a/dom/xbl/moz.build b/dom/xbl/moz.build
new file mode 100644
index 0000000000..0950db0361
--- /dev/null
+++ b/dom/xbl/moz.build
@@ -0,0 +1,53 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['builtin']
+
+EXPORTS += [
+    'nsBindingManager.h',
+    'nsXBLBinding.h',
+    'nsXBLService.h',
+]
+
+EXPORTS.mozilla.dom += [
+    'XBLChildrenElement.h',
+]
+
+UNIFIED_SOURCES += [
+    'nsBindingManager.cpp',
+    'nsXBLBinding.cpp',
+    'nsXBLContentSink.cpp',
+    'nsXBLDocumentInfo.cpp',
+    'nsXBLEventHandler.cpp',
+    'nsXBLProtoImpl.cpp',
+    'nsXBLProtoImplField.cpp',
+    'nsXBLProtoImplMethod.cpp',
+    'nsXBLProtoImplProperty.cpp',
+    'nsXBLPrototypeBinding.cpp',
+    'nsXBLPrototypeHandler.cpp',
+    'nsXBLPrototypeResources.cpp',
+    'nsXBLResourceLoader.cpp',
+    'nsXBLSerialize.cpp',
+    'nsXBLService.cpp',
+    'nsXBLWindowKeyHandler.cpp',
+    'XBLChildrenElement.cpp',
+]
+
+LOCAL_INCLUDES += [
+    '/dom/base',
+    '/dom/html',
+    '/dom/xml',
+    '/dom/xul',
+    '/layout/style',
+]
+
+FINAL_LIBRARY = 'xul'
+
+MOCHITEST_MANIFESTS += ['test/mochitest.ini']
+MOCHITEST_CHROME_MANIFESTS += ['test/chrome.ini']
+
+if CONFIG['GNU_CXX']:
+    CXXFLAGS += ['-Wno-error=shadow']
diff --git a/dom/xbl/nsBindingManager.cpp b/dom/xbl/nsBindingManager.cpp
new file mode 100644
index 0000000000..405c7aac7b
--- /dev/null
+++ b/dom/xbl/nsBindingManager.cpp
@@ -0,0 +1,1160 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsBindingManager.h"
+
+#include "nsAutoPtr.h"
+#include "nsCOMPtr.h"
+#include "nsXBLService.h"
+#include "nsIInputStream.h"
+#include "nsIURI.h"
+#include "nsIURL.h"
+#include "nsIChannel.h"
+#include "nsXPIDLString.h"
+#include "plstr.h"
+#include "nsIContent.h"
+#include "nsIDOMElement.h"
+#include "nsIDocument.h"
+#include "nsContentUtils.h"
+#include "nsIPresShell.h"
+#include "nsIXMLContentSink.h"
+#include "nsContentCID.h"
+#include "mozilla/dom/XMLDocument.h"
+#include "nsIStreamListener.h"
+#include "ChildIterator.h"
+#include "nsITimer.h"
+
+#include "nsXBLBinding.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsXBLDocumentInfo.h"
+#include "mozilla/dom/XBLChildrenElement.h"
+
+#include "nsIStyleRuleProcessor.h"
+#include "nsRuleProcessorData.h"
+#include "nsIWeakReference.h"
+
+#include "nsWrapperCacheInlines.h"
+#include "nsIXPConnect.h"
+#include "nsDOMCID.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsTHashtable.h"
+
+#include "nsIScriptContext.h"
+#include "xpcpublic.h"
+#include "jswrapper.h"
+
+#include "nsThreadUtils.h"
+#include "mozilla/dom/NodeListBinding.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/Unused.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+// Implement our nsISupports methods
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsBindingManager)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsBindingManager)
+  tmp->mDestroyed = true;
+
+  if (tmp->mBoundContentSet)
+    tmp->mBoundContentSet->Clear();
+
+  if (tmp->mDocumentTable)
+    tmp->mDocumentTable->Clear();
+
+  if (tmp->mLoadingDocTable)
+    tmp->mLoadingDocTable->Clear();
+
+  if (tmp->mWrapperTable) {
+    tmp->mWrapperTable->Clear();
+    tmp->mWrapperTable = nullptr;
+  }
+
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mAttachedStack)
+
+  if (tmp->mProcessAttachedQueueEvent) {
+    tmp->mProcessAttachedQueueEvent->Revoke();
+  }
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsBindingManager)
+  // The hashes keyed on nsIContent are traversed from the nsIContent itself.
+  if (tmp->mDocumentTable) {
+    for (auto iter = tmp->mDocumentTable->Iter(); !iter.Done(); iter.Next()) {
+      NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mDocumentTable value");
+      cb.NoteXPCOMChild(iter.UserData());
+    }
+  }
+  if (tmp->mLoadingDocTable) {
+    for (auto iter = tmp->mLoadingDocTable->Iter(); !iter.Done(); iter.Next()) {
+      NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mLoadingDocTable value");
+      cb.NoteXPCOMChild(iter.UserData());
+    }
+  }
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAttachedStack)
+  // No need to traverse mProcessAttachedQueueEvent, since it'll just
+  // fire at some point or become revoke and drop its ref to us.
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsBindingManager)
+  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsBindingManager)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsBindingManager)
+
+// Constructors/Destructors
+nsBindingManager::nsBindingManager(nsIDocument* aDocument)
+  : mProcessingAttachedStack(false),
+    mDestroyed(false),
+    mAttachedStackSizeOnOutermost(0),
+    mDocument(aDocument)
+{
+}
+
+nsBindingManager::~nsBindingManager(void)
+{
+  mDestroyed = true;
+}
+
+nsXBLBinding*
+nsBindingManager::GetBindingWithContent(const nsIContent* aContent)
+{
+  nsXBLBinding* binding = aContent ? aContent->GetXBLBinding() : nullptr;
+  return binding ? binding->GetBindingWithContent() : nullptr;
+}
+
+void
+nsBindingManager::AddBoundContent(nsIContent* aContent)
+{
+  if (!mBoundContentSet) {
+    mBoundContentSet = new nsTHashtable<nsRefPtrHashKey<nsIContent> >;
+  }
+  mBoundContentSet->PutEntry(aContent);
+}
+
+void
+nsBindingManager::RemoveBoundContent(nsIContent* aContent)
+{
+  if (mBoundContentSet) {
+    mBoundContentSet->RemoveEntry(aContent);
+  }
+
+  // The death of the bindings means the death of the JS wrapper.
+  SetWrappedJS(aContent, nullptr);
+}
+
+nsIXPConnectWrappedJS*
+nsBindingManager::GetWrappedJS(nsIContent* aContent)
+{
+  if (!mWrapperTable) {
+    return nullptr;
+  }
+
+  if (!aContent || !aContent->HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
+    return nullptr;
+  }
+
+  return mWrapperTable->GetWeak(aContent);
+}
+
+nsresult
+nsBindingManager::SetWrappedJS(nsIContent* aContent, nsIXPConnectWrappedJS* aWrappedJS)
+{
+  if (mDestroyed) {
+    return NS_OK;
+  }
+
+  if (aWrappedJS) {
+    // lazily create the table, but only when adding elements
+    if (!mWrapperTable) {
+      mWrapperTable = new WrapperHashtable();
+    }
+    aContent->SetFlags(NODE_MAY_BE_IN_BINDING_MNGR);
+
+    NS_ASSERTION(aContent, "key must be non-null");
+    if (!aContent) return NS_ERROR_INVALID_ARG;
+
+    mWrapperTable->Put(aContent, aWrappedJS);
+
+    return NS_OK;
+  }
+
+  // no value, so remove the key from the table
+  if (mWrapperTable) {
+    mWrapperTable->Remove(aContent);
+  }
+
+  return NS_OK;
+}
+
+void
+nsBindingManager::RemovedFromDocumentInternal(nsIContent* aContent,
+                                              nsIDocument* aOldDocument,
+                                              DestructorHandling aDestructorHandling)
+{
+  NS_PRECONDITION(aOldDocument != nullptr, "no old document");
+
+  RefPtr<nsXBLBinding> binding = aContent->GetXBLBinding();
+  if (binding) {
+    // The binding manager may have been destroyed before a runnable
+    // has had a chance to reach this point. If so, we bail out on calling
+    // BindingDetached (which may invoke a XBL destructor) and
+    // ChangeDocument, but we still want to clear out the binding
+    // and insertion parent that may hold references.
+    if (!mDestroyed && aDestructorHandling == eRunDtor) {
+      binding->PrototypeBinding()->BindingDetached(binding->GetBoundElement());
+      binding->ChangeDocument(aOldDocument, nullptr);
+    }
+
+    aContent->SetXBLBinding(nullptr, this);
+  }
+
+  // Clear out insertion parent and content lists.
+  aContent->SetXBLInsertionParent(nullptr);
+}
+
+nsIAtom*
+nsBindingManager::ResolveTag(nsIContent* aContent, int32_t* aNameSpaceID)
+{
+  nsXBLBinding *binding = aContent->GetXBLBinding();
+
+  if (binding) {
+    nsIAtom* base = binding->GetBaseTag(aNameSpaceID);
+
+    if (base) {
+      return base;
+    }
+  }
+
+  *aNameSpaceID = aContent->GetNameSpaceID();
+  return aContent->NodeInfo()->NameAtom();
+}
+
+nsresult
+nsBindingManager::GetAnonymousNodesFor(nsIContent* aContent,
+                                       nsIDOMNodeList** aResult)
+{
+  NS_IF_ADDREF(*aResult = GetAnonymousNodesFor(aContent));
+  return NS_OK;
+}
+
+nsINodeList*
+nsBindingManager::GetAnonymousNodesFor(nsIContent* aContent)
+{
+  nsXBLBinding* binding = GetBindingWithContent(aContent);
+  return binding ? binding->GetAnonymousNodeList() : nullptr;
+}
+
+nsresult
+nsBindingManager::ClearBinding(nsIContent* aContent)
+{
+  // Hold a ref to the binding so it won't die when we remove it from our table
+  RefPtr<nsXBLBinding> binding =
+    aContent ? aContent->GetXBLBinding() : nullptr;
+
+  if (!binding) {
+    return NS_OK;
+  }
+
+  // For now we can only handle removing a binding if it's the only one
+  NS_ENSURE_FALSE(binding->GetBaseBinding(), NS_ERROR_FAILURE);
+
+  // Hold strong ref in case removing the binding tries to close the
+  // window or something.
+  // XXXbz should that be ownerdoc?  Wouldn't we need a ref to the
+  // currentdoc too?  What's the one that should be passed to
+  // ChangeDocument?
+  nsCOMPtr<nsIDocument> doc = aContent->OwnerDoc();
+
+  // Finally remove the binding...
+  // XXXbz this doesn't remove the implementation!  Should fix!  Until
+  // then we need the explicit UnhookEventHandlers here.
+  binding->UnhookEventHandlers();
+  binding->ChangeDocument(doc, nullptr);
+  aContent->SetXBLBinding(nullptr, this);
+  binding->MarkForDeath();
+
+  // ...and recreate its frames. We need to do this since the frames may have
+  // been removed and style may have changed due to the removal of the
+  // anonymous children.
+  // XXXbz this should be using the current doc (if any), not the owner doc.
+  nsIPresShell *presShell = doc->GetShell();
+  NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);
+
+  return presShell->RecreateFramesFor(aContent);;
+}
+
+nsresult
+nsBindingManager::LoadBindingDocument(nsIDocument* aBoundDoc,
+                                      nsIURI* aURL,
+                                      nsIPrincipal* aOriginPrincipal)
+{
+  NS_PRECONDITION(aURL, "Must have a URI to load!");
+
+  // First we need to load our binding.
+  nsXBLService* xblService = nsXBLService::GetInstance();
+  if (!xblService)
+    return NS_ERROR_FAILURE;
+
+  // Load the binding doc.
+  RefPtr<nsXBLDocumentInfo> info;
+  xblService->LoadBindingDocumentInfo(nullptr, aBoundDoc, aURL,
+                                      aOriginPrincipal, true,
+                                      getter_AddRefs(info));
+  if (!info)
+    return NS_ERROR_FAILURE;
+
+  return NS_OK;
+}
+
+void
+nsBindingManager::RemoveFromAttachedQueue(nsXBLBinding* aBinding)
+{
+  // Don't remove items here as that could mess up an executing
+  // ProcessAttachedQueue. Instead, null the entry in the queue.
+  size_t index = mAttachedStack.IndexOf(aBinding);
+  if (index != mAttachedStack.NoIndex) {
+    mAttachedStack[index] = nullptr;
+  }
+}
+
+nsresult
+nsBindingManager::AddToAttachedQueue(nsXBLBinding* aBinding)
+{
+  mAttachedStack.AppendElement(aBinding);
+
+  // If we're in the middle of processing our queue already, don't
+  // bother posting the event.
+  if (!mProcessingAttachedStack && !mProcessAttachedQueueEvent) {
+    PostProcessAttachedQueueEvent();
+  }
+
+  // Make sure that flushes will flush out the new items as needed.
+  mDocument->SetNeedStyleFlush();
+
+  return NS_OK;
+
+}
+
+void
+nsBindingManager::PostProcessAttachedQueueEvent()
+{
+  mProcessAttachedQueueEvent =
+    NewRunnableMethod(this, &nsBindingManager::DoProcessAttachedQueue);
+  nsresult rv = NS_DispatchToCurrentThread(mProcessAttachedQueueEvent);
+  if (NS_SUCCEEDED(rv) && mDocument) {
+    mDocument->BlockOnload();
+  }
+}
+
+// static
+void
+nsBindingManager::PostPAQEventCallback(nsITimer* aTimer, void* aClosure)
+{
+  RefPtr<nsBindingManager> mgr = 
+    already_AddRefed<nsBindingManager>(static_cast<nsBindingManager*>(aClosure));
+  mgr->PostProcessAttachedQueueEvent();
+  NS_RELEASE(aTimer);
+}
+
+void
+nsBindingManager::DoProcessAttachedQueue()
+{
+  if (!mProcessingAttachedStack) {
+    ProcessAttachedQueue();
+
+    NS_ASSERTION(mAttachedStack.Length() == 0,
+               "Shouldn't have pending bindings!");
+
+    mProcessAttachedQueueEvent = nullptr;
+  } else {
+    // Someone's doing event processing from inside a constructor.
+    // They're evil, but we'll fight back!  Just poll on them being
+    // done and repost the attached queue event.
+    //
+    // But don't poll in a tight loop -- otherwise we keep the Gecko
+    // event loop non-empty and trigger bug 1021240 on OS X.
+    nsresult rv = NS_ERROR_FAILURE;
+    nsCOMPtr<nsITimer> timer = do_CreateInstance(NS_TIMER_CONTRACTID);
+    if (timer) {
+      rv = timer->InitWithFuncCallback(PostPAQEventCallback, this,
+                                       100, nsITimer::TYPE_ONE_SHOT);
+    }
+    if (NS_SUCCEEDED(rv)) {
+      NS_ADDREF_THIS();
+      // We drop our reference to the timer here, since the timer callback is
+      // responsible for releasing the object.
+      Unused << timer.forget().take();
+    }
+  }
+
+  // No matter what, unblock onload for the event that's fired.
+  if (mDocument) {
+    // Hold a strong reference while calling UnblockOnload since that might
+    // run script.
+    nsCOMPtr<nsIDocument> doc = mDocument;
+    doc->UnblockOnload(true);
+  }
+}
+
+void
+nsBindingManager::ProcessAttachedQueueInternal(uint32_t aSkipSize)
+{
+  mProcessingAttachedStack = true;
+
+  // Excute constructors. Do this from high index to low
+  while (mAttachedStack.Length() > aSkipSize) {
+    uint32_t lastItem = mAttachedStack.Length() - 1;
+    RefPtr<nsXBLBinding> binding = mAttachedStack.ElementAt(lastItem);
+    mAttachedStack.RemoveElementAt(lastItem);
+    if (binding) {
+      binding->ExecuteAttachedHandler();
+    }
+  }
+
+  // If NodeWillBeDestroyed has run we don't want to clobber
+  // mProcessingAttachedStack set there.
+  if (mDocument) {
+    mProcessingAttachedStack = false;
+  }
+
+  NS_ASSERTION(mAttachedStack.Length() == aSkipSize, "How did we get here?");
+
+  mAttachedStack.Compact();
+}
+
+// Keep bindings and bound elements alive while executing detached handlers.
+void
+nsBindingManager::ExecuteDetachedHandlers()
+{
+  // Walk our hashtable of bindings.
+  if (!mBoundContentSet) {
+    return;
+  }
+
+  nsCOMArray<nsIContent> boundElements;
+  nsBindingList bindings;
+
+  for (auto iter = mBoundContentSet->Iter(); !iter.Done(); iter.Next()) {
+    nsXBLBinding* binding = iter.Get()->GetKey()->GetXBLBinding();
+    if (binding && bindings.AppendElement(binding)) {
+      if (!boundElements.AppendObject(binding->GetBoundElement())) {
+        bindings.RemoveElementAt(bindings.Length() - 1);
+      }
+    }
+  }
+
+  uint32_t i, count = bindings.Length();
+  for (i = 0; i < count; ++i) {
+    bindings[i]->ExecuteDetachedHandler();
+  }
+}
+
+nsresult
+nsBindingManager::PutXBLDocumentInfo(nsXBLDocumentInfo* aDocumentInfo)
+{
+  NS_PRECONDITION(aDocumentInfo, "Must have a non-null documentinfo!");
+
+  if (!mDocumentTable) {
+    mDocumentTable = new nsRefPtrHashtable<nsURIHashKey,nsXBLDocumentInfo>();
+  }
+
+  mDocumentTable->Put(aDocumentInfo->DocumentURI(), aDocumentInfo);
+
+  return NS_OK;
+}
+
+void
+nsBindingManager::RemoveXBLDocumentInfo(nsXBLDocumentInfo* aDocumentInfo)
+{
+  if (mDocumentTable) {
+    mDocumentTable->Remove(aDocumentInfo->DocumentURI());
+  }
+}
+
+nsXBLDocumentInfo*
+nsBindingManager::GetXBLDocumentInfo(nsIURI* aURL)
+{
+  if (!mDocumentTable)
+    return nullptr;
+
+  return mDocumentTable->GetWeak(aURL);
+}
+
+nsresult
+nsBindingManager::PutLoadingDocListener(nsIURI* aURL, nsIStreamListener* aListener)
+{
+  NS_PRECONDITION(aListener, "Must have a non-null listener!");
+
+  if (!mLoadingDocTable) {
+    mLoadingDocTable =
+      new nsInterfaceHashtable<nsURIHashKey,nsIStreamListener>();
+  }
+  mLoadingDocTable->Put(aURL, aListener);
+
+  return NS_OK;
+}
+
+nsIStreamListener*
+nsBindingManager::GetLoadingDocListener(nsIURI* aURL)
+{
+  if (!mLoadingDocTable)
+    return nullptr;
+
+  return mLoadingDocTable->GetWeak(aURL);
+}
+
+void
+nsBindingManager::RemoveLoadingDocListener(nsIURI* aURL)
+{
+  if (mLoadingDocTable) {
+    mLoadingDocTable->Remove(aURL);
+  }
+}
+
+void
+nsBindingManager::FlushSkinBindings()
+{
+  if (!mBoundContentSet) {
+    return;
+  }
+
+  for (auto iter = mBoundContentSet->Iter(); !iter.Done(); iter.Next()) {
+    nsXBLBinding* binding = iter.Get()->GetKey()->GetXBLBinding();
+
+    if (binding->MarkedForDeath()) {
+      continue;
+    }
+
+    nsAutoCString path;
+    binding->PrototypeBinding()->DocURI()->GetPath(path);
+
+    if (!strncmp(path.get(), "/skin", 5)) {
+      binding->MarkForDeath();
+    }
+  }
+}
+
+// Used below to protect from recurring in QI calls through XPConnect.
+struct AntiRecursionData {
+  nsIContent* element;
+  REFNSIID iid;
+  AntiRecursionData* next;
+
+  AntiRecursionData(nsIContent* aElement,
+                    REFNSIID aIID,
+                    AntiRecursionData* aNext)
+    : element(aElement), iid(aIID), next(aNext) {}
+};
+
+nsresult
+nsBindingManager::GetBindingImplementation(nsIContent* aContent, REFNSIID aIID,
+                                           void** aResult)
+{
+  *aResult = nullptr;
+  nsXBLBinding *binding = aContent ? aContent->GetXBLBinding() : nullptr;
+  if (binding) {
+    // The binding should not be asked for nsISupports
+    NS_ASSERTION(!aIID.Equals(NS_GET_IID(nsISupports)), "Asking a binding for nsISupports");
+    if (binding->ImplementsInterface(aIID)) {
+      nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS = GetWrappedJS(aContent);
+
+      if (wrappedJS) {
+        // Protect from recurring in QI calls through XPConnect.
+        // This can happen when a second binding is being resolved.
+        // At that point a wrappedJS exists, but it doesn't yet know about
+        // the iid we are asking for. So, without this protection,
+        // AggregatedQueryInterface would end up recurring back into itself
+        // through this code.
+        //
+        // With this protection, when we detect the recursion we return
+        // NS_NOINTERFACE in the inner call. The outer call will then fall
+        // through (see below) and build a new chained wrappedJS for the iid.
+        //
+        // We're careful to not assume that only one direct nesting can occur
+        // because there is a call into JS in the middle and we can't assume
+        // that this code won't be reached by some more complex nesting path.
+        //
+        // NOTE: We *assume* this is single threaded, so we can use a
+        // static linked list to do the check.
+
+        static AntiRecursionData* list = nullptr;
+
+        for (AntiRecursionData* p = list; p; p = p->next) {
+          if (p->element == aContent && p->iid.Equals(aIID)) {
+            *aResult = nullptr;
+            return NS_NOINTERFACE;
+          }
+        }
+
+        AntiRecursionData item(aContent, aIID, list);
+        list = &item;
+
+        nsresult rv = wrappedJS->AggregatedQueryInterface(aIID, aResult);
+
+        list = item.next;
+
+        if (*aResult)
+          return rv;
+
+        // No result was found, so this must be another XBL interface.
+        // Fall through to create a new wrapper.
+      }
+
+      // We have never made a wrapper for this implementation.
+      // Create an XPC wrapper for the script object and hand it back.
+      AutoJSAPI jsapi;
+      jsapi.Init();
+      JSContext* cx = jsapi.cx();
+
+      nsIXPConnect *xpConnect = nsContentUtils::XPConnect();
+
+      JS::Rooted<JSObject*> jsobj(cx, aContent->GetWrapper());
+      NS_ENSURE_TRUE(jsobj, NS_NOINTERFACE);
+
+      // If we're using an XBL scope, we need to use the Xray view to the bound
+      // content in order to view the full array of methods defined in the
+      // binding, some of which may not be exposed on the prototype of
+      // untrusted content. We don't need to consider add-on scopes here
+      // because they're chrome-only and no Xrays are involved.
+      //
+      // If there's no separate XBL scope, or if the reflector itself lives in
+      // the XBL scope, we'll end up with the global of the reflector.
+      JS::Rooted<JSObject*> xblScope(cx, xpc::GetXBLScopeOrGlobal(cx, jsobj));
+      NS_ENSURE_TRUE(xblScope, NS_ERROR_UNEXPECTED);
+      JSAutoCompartment ac(cx, xblScope);
+      bool ok = JS_WrapObject(cx, &jsobj);
+      NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
+      MOZ_ASSERT_IF(js::IsWrapper(jsobj), xpc::IsXrayWrapper(jsobj));
+
+      nsresult rv = xpConnect->WrapJSAggregatedToNative(aContent, cx,
+                                                        jsobj, aIID, aResult);
+      if (NS_FAILED(rv))
+        return rv;
+
+      // We successfully created a wrapper.  We will own this wrapper for as long as the binding remains
+      // alive.  At the time the binding is cleared out of the bindingManager, we will remove the wrapper
+      // from the bindingManager as well.
+      nsISupports* supp = static_cast<nsISupports*>(*aResult);
+      wrappedJS = do_QueryInterface(supp);
+      SetWrappedJS(aContent, wrappedJS);
+
+      return rv;
+    }
+  }
+
+  *aResult = nullptr;
+  return NS_NOINTERFACE;
+}
+
+nsresult
+nsBindingManager::WalkRules(nsIStyleRuleProcessor::EnumFunc aFunc,
+                            ElementDependentRuleProcessorData* aData,
+                            bool* aCutOffInheritance)
+{
+  *aCutOffInheritance = false;
+
+  NS_ASSERTION(aData->mElement, "How did that happen?");
+
+  // Walk the binding scope chain, starting with the binding attached to our
+  // content, up till we run out of scopes or we get cut off.
+  nsIContent *content = aData->mElement;
+
+  do {
+    nsXBLBinding *binding = content->GetXBLBinding();
+    if (binding) {
+      aData->mTreeMatchContext.mScopedRoot = content;
+      binding->WalkRules(aFunc, aData);
+      // If we're not looking at our original content, allow the binding to cut
+      // off style inheritance
+      if (content != aData->mElement) {
+        if (!binding->InheritsStyle()) {
+          // Go no further; we're not inheriting style from anything above here
+          break;
+        }
+      }
+    }
+
+    if (content->IsRootOfNativeAnonymousSubtree()) {
+      break; // Deliberately cut off style inheritance here.
+    }
+
+    content = content->GetBindingParent();
+  } while (content);
+
+  // If "content" is non-null that means we cut off inheritance at some point
+  // in the loop.
+  *aCutOffInheritance = (content != nullptr);
+
+  // Null out the scoped root that we set repeatedly
+  aData->mTreeMatchContext.mScopedRoot = nullptr;
+
+  return NS_OK;
+}
+
+typedef nsTHashtable<nsPtrHashKey<nsIStyleRuleProcessor> > RuleProcessorSet;
+
+static RuleProcessorSet*
+GetContentSetRuleProcessors(nsTHashtable<nsRefPtrHashKey<nsIContent>>* aContentSet)
+{
+  RuleProcessorSet* set = nullptr;
+
+  for (auto iter = aContentSet->Iter(); !iter.Done(); iter.Next()) {
+    nsIContent* boundContent = iter.Get()->GetKey();
+    for (nsXBLBinding* binding = boundContent->GetXBLBinding(); binding;
+         binding = binding->GetBaseBinding()) {
+      nsIStyleRuleProcessor* ruleProc =
+        binding->PrototypeBinding()->GetRuleProcessor();
+      if (ruleProc) {
+        if (!set) {
+          set = new RuleProcessorSet;
+        }
+        set->PutEntry(ruleProc);
+      }
+    }
+  }
+
+  return set;
+}
+
+void
+nsBindingManager::WalkAllRules(nsIStyleRuleProcessor::EnumFunc aFunc,
+                               ElementDependentRuleProcessorData* aData)
+{
+  if (!mBoundContentSet) {
+    return;
+  }
+
+  nsAutoPtr<RuleProcessorSet> set;
+  set = GetContentSetRuleProcessors(mBoundContentSet);
+  if (!set) {
+    return;
+  }
+
+  for (auto iter = set->Iter(); !iter.Done(); iter.Next()) {
+    nsIStyleRuleProcessor* ruleProcessor = iter.Get()->GetKey();
+    (*(aFunc))(ruleProcessor, aData);
+  }
+}
+
+nsresult
+nsBindingManager::MediumFeaturesChanged(nsPresContext* aPresContext,
+                                        bool* aRulesChanged)
+{
+  *aRulesChanged = false;
+  if (!mBoundContentSet) {
+    return NS_OK;
+  }
+
+  nsAutoPtr<RuleProcessorSet> set;
+  set = GetContentSetRuleProcessors(mBoundContentSet);
+  if (!set) {
+    return NS_OK;
+  }
+
+  for (auto iter = set->Iter(); !iter.Done(); iter.Next()) {
+    nsIStyleRuleProcessor* ruleProcessor = iter.Get()->GetKey();
+    bool thisChanged = ruleProcessor->MediumFeaturesChanged(aPresContext);
+    *aRulesChanged = *aRulesChanged || thisChanged;
+  }
+
+  return NS_OK;
+}
+
+void
+nsBindingManager::AppendAllSheets(nsTArray<StyleSheet*>& aArray)
+{
+  if (!mBoundContentSet) {
+    return;
+  }
+
+  for (auto iter = mBoundContentSet->Iter(); !iter.Done(); iter.Next()) {
+    nsIContent* boundContent = iter.Get()->GetKey();
+    for (nsXBLBinding* binding = boundContent->GetXBLBinding(); binding;
+         binding = binding->GetBaseBinding()) {
+      binding->PrototypeBinding()->AppendStyleSheetsTo(aArray);
+    }
+  }
+}
+
+static void
+InsertAppendedContent(XBLChildrenElement* aPoint,
+                      nsIContent* aFirstNewContent)
+{
+  int32_t insertionIndex;
+  if (nsIContent* prevSibling = aFirstNewContent->GetPreviousSibling()) {
+    // If we have a previous sibling, then it must already be in aPoint. Find
+    // it and insert after it.
+    insertionIndex = aPoint->IndexOfInsertedChild(prevSibling);
+    MOZ_ASSERT(insertionIndex != -1);
+
+    // Our insertion index is one after our previous sibling's index.
+    ++insertionIndex;
+  } else {
+    // Otherwise, we append.
+    // TODO This is wrong for nested insertion points. In that case, we need to
+    // keep track of the right index to insert into.
+    insertionIndex = aPoint->InsertedChildrenLength();
+  }
+
+  // Do the inserting.
+  for (nsIContent* currentChild = aFirstNewContent;
+       currentChild;
+       currentChild = currentChild->GetNextSibling()) {
+    aPoint->InsertInsertedChildAt(currentChild, insertionIndex++);
+  }
+}
+
+void
+nsBindingManager::ContentAppended(nsIDocument* aDocument,
+                                  nsIContent* aContainer,
+                                  nsIContent* aFirstNewContent,
+                                  int32_t     aNewIndexInContainer)
+{
+  if (aNewIndexInContainer == -1) {
+    return;
+  }
+
+  // Try to find insertion points for all the new kids.
+  XBLChildrenElement* point = nullptr;
+  nsIContent* parent = aContainer;
+
+  // Handle appending of default content.
+  if (parent && parent->IsActiveChildrenElement()) {
+    XBLChildrenElement* childrenEl = static_cast<XBLChildrenElement*>(parent);
+    if (childrenEl->HasInsertedChildren()) {
+      // Appending default content that isn't being used. Ignore.
+      return;
+    }
+
+    childrenEl->MaybeSetupDefaultContent();
+    parent = childrenEl->GetParent();
+  }
+
+  bool first = true;
+  do {
+    nsXBLBinding* binding = GetBindingWithContent(parent);
+    if (!binding) {
+      break;
+    }
+
+    if (binding->HasFilteredInsertionPoints()) {
+      // There are filtered insertion points involved, handle each child
+      // separately.
+      // We could optimize this in the case when we've nested a few levels
+      // deep already, without hitting bindings that have filtered insertion
+      // points.
+      int32_t currentIndex = aNewIndexInContainer;
+      for (nsIContent* currentChild = aFirstNewContent; currentChild;
+           currentChild = currentChild->GetNextSibling()) {
+        HandleChildInsertion(aContainer, currentChild,
+                             currentIndex++, true);
+      }
+
+      return;
+    }
+
+    point = binding->GetDefaultInsertionPoint();
+    if (!point) {
+      break;
+    }
+
+    // Even though we're in ContentAppended, nested insertion points force us
+    // to deal with this append as an insertion except in the outermost
+    // binding.
+    if (first) {
+      first = false;
+      for (nsIContent* child = aFirstNewContent; child;
+           child = child->GetNextSibling()) {
+        point->AppendInsertedChild(child);
+      }
+    } else {
+      InsertAppendedContent(point, aFirstNewContent);
+    }
+
+    nsIContent* newParent = point->GetParent();
+    if (newParent == parent) {
+      break;
+    }
+    parent = newParent;
+  } while (parent);
+}
+
+void
+nsBindingManager::ContentInserted(nsIDocument* aDocument,
+                                  nsIContent* aContainer,
+                                  nsIContent* aChild,
+                                  int32_t aIndexInContainer)
+{
+  if (aIndexInContainer == -1) {
+    return;
+  }
+
+  HandleChildInsertion(aContainer, aChild, aIndexInContainer, false);
+}
+
+void
+nsBindingManager::ContentRemoved(nsIDocument* aDocument,
+                                 nsIContent* aContainer,
+                                 nsIContent* aChild,
+                                 int32_t aIndexInContainer,
+                                 nsIContent* aPreviousSibling)
+{
+  aChild->SetXBLInsertionParent(nullptr);
+
+  XBLChildrenElement* point = nullptr;
+  nsIContent* parent = aContainer;
+
+  // Handle appending of default content.
+  if (parent && parent->IsActiveChildrenElement()) {
+    XBLChildrenElement* childrenEl = static_cast<XBLChildrenElement*>(parent);
+    if (childrenEl->HasInsertedChildren()) {
+      // Removing default content that isn't being used. Ignore.
+      return;
+    }
+
+    parent = childrenEl->GetParent();
+  }
+
+  do {
+    nsXBLBinding* binding = GetBindingWithContent(parent);
+    if (!binding) {
+      // If aChild is XBL content, it might have <xbl:children> elements
+      // somewhere under it. We need to inform those elements that they're no
+      // longer in the tree so they can tell their distributed children that
+      // they're no longer distributed under them.
+      // XXX This is wrong. We need to do far more work to update the parent
+      // binding's list of insertion points and to get the new insertion parent
+      // for the newly-distributed children correct.
+      if (aChild->GetBindingParent()) {
+        ClearInsertionPointsRecursively(aChild);
+      }
+      return;
+    }
+
+    point = binding->FindInsertionPointFor(aChild);
+    if (!point) {
+      break;
+    }
+
+    point->RemoveInsertedChild(aChild);
+
+    nsIContent* newParent = point->GetParent();
+    if (newParent == parent) {
+      break;
+    }
+    parent = newParent;
+  } while (parent);
+}
+
+void
+nsBindingManager::ClearInsertionPointsRecursively(nsIContent* aContent)
+{
+  if (aContent->NodeInfo()->Equals(nsGkAtoms::children, kNameSpaceID_XBL)) {
+    static_cast<XBLChildrenElement*>(aContent)->ClearInsertedChildren();
+  }
+
+  for (nsIContent* child = aContent->GetFirstChild(); child;
+       child = child->GetNextSibling()) {
+    ClearInsertionPointsRecursively(child);
+  }
+}
+
+void
+nsBindingManager::DropDocumentReference()
+{
+  mDestroyed = true;
+
+  // Make sure to not run any more XBL constructors
+  mProcessingAttachedStack = true;
+  if (mProcessAttachedQueueEvent) {
+    mProcessAttachedQueueEvent->Revoke();
+  }
+
+  if (mBoundContentSet) {
+    mBoundContentSet->Clear();
+  }
+
+  mDocument = nullptr;
+}
+
+void
+nsBindingManager::Traverse(nsIContent *aContent,
+                           nsCycleCollectionTraversalCallback &cb)
+{
+  if (!aContent->HasFlag(NODE_MAY_BE_IN_BINDING_MNGR) ||
+      !aContent->IsElement()) {
+    // Don't traverse if content is not in this binding manager.
+    // We also don't traverse non-elements because there should not
+    // be bindings (checking the flag alone is not sufficient because
+    // the flag is also set on children of insertion points that may be
+    // non-elements).
+    return;
+  }
+
+  if (mBoundContentSet && mBoundContentSet->Contains(aContent)) {
+    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "[via binding manager] mBoundContentSet entry");
+    cb.NoteXPCOMChild(aContent);
+  }
+
+  nsIXPConnectWrappedJS *value = GetWrappedJS(aContent);
+  if (value) {
+    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "[via binding manager] mWrapperTable key");
+    cb.NoteXPCOMChild(aContent);
+    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "[via binding manager] mWrapperTable value");
+    cb.NoteXPCOMChild(value);
+  }
+}
+
+void
+nsBindingManager::HandleChildInsertion(nsIContent* aContainer,
+                                       nsIContent* aChild,
+                                       uint32_t aIndexInContainer,
+                                       bool aAppend)
+{
+  NS_PRECONDITION(aChild, "Must have child");
+  NS_PRECONDITION(!aContainer ||
+                  uint32_t(aContainer->IndexOf(aChild)) == aIndexInContainer,
+                  "Child not at the right index?");
+
+  XBLChildrenElement* point = nullptr;
+  nsIContent* parent = aContainer;
+
+  // Handle insertion of default content.
+  if (parent && parent->IsActiveChildrenElement()) {
+    XBLChildrenElement* childrenEl = static_cast<XBLChildrenElement*>(parent);
+    if (childrenEl->HasInsertedChildren()) {
+      // Inserting default content that isn't being used. Ignore.
+      return;
+    }
+
+    childrenEl->MaybeSetupDefaultContent();
+    parent = childrenEl->GetParent();
+  }
+
+  while (parent) {
+    nsXBLBinding* binding = GetBindingWithContent(parent);
+    if (!binding) {
+      break;
+    }
+
+    point = binding->FindInsertionPointFor(aChild);
+    if (!point) {
+      break;
+    }
+
+    // Insert the child into the proper insertion point.
+    // TODO If there were multiple insertion points, this approximation can be
+    // wrong. We need to re-run the distribution algorithm. In the meantime,
+    // this should work well enough.
+    uint32_t index = aAppend ? point->InsertedChildrenLength() : 0;
+    for (nsIContent* currentSibling = aChild->GetPreviousSibling();
+         currentSibling;
+         currentSibling = currentSibling->GetPreviousSibling()) {
+      // If we find one of our previous siblings in the insertion point, the
+      // index following it is the correct insertion point. Otherwise, we guess
+      // based on whether we're appending or inserting.
+      int32_t pointIndex = point->IndexOfInsertedChild(currentSibling);
+      if (pointIndex != -1) {
+        index = pointIndex + 1;
+        break;
+      }
+    }
+
+    point->InsertInsertedChildAt(aChild, index);
+
+    nsIContent* newParent = point->GetParent();
+    if (newParent == parent) {
+      break;
+    }
+
+    parent = newParent;
+  }
+}
+
+
+nsIContent*
+nsBindingManager::FindNestedInsertionPoint(nsIContent* aContainer,
+                                           nsIContent* aChild)
+{
+  NS_PRECONDITION(aChild->GetParent() == aContainer,
+                  "Wrong container");
+
+  nsIContent* parent = aContainer;
+  if (aContainer->IsActiveChildrenElement()) {
+    if (static_cast<XBLChildrenElement*>(aContainer)->
+          HasInsertedChildren()) {
+      return nullptr;
+    }
+    parent = aContainer->GetParent();
+  }
+
+  while (parent) {
+    nsXBLBinding* binding = GetBindingWithContent(parent);
+    if (!binding) {
+      break;
+    }
+
+    XBLChildrenElement* point = binding->FindInsertionPointFor(aChild);
+    if (!point) {
+      return nullptr;
+    }
+
+    nsIContent* newParent = point->GetParent();
+    if (newParent == parent) {
+      break;
+    }
+    parent = newParent;
+  }
+
+  return parent;
+}
+
+nsIContent*
+nsBindingManager::FindNestedSingleInsertionPoint(nsIContent* aContainer,
+                                                 bool* aMulti)
+{
+  *aMulti = false;
+
+  nsIContent* parent = aContainer;
+  if (aContainer->IsActiveChildrenElement()) {
+    if (static_cast<XBLChildrenElement*>(aContainer)->
+          HasInsertedChildren()) {
+      return nullptr;
+    }
+    parent = aContainer->GetParent();
+  }
+
+  while(parent) {
+    nsXBLBinding* binding = GetBindingWithContent(parent);
+    if (!binding) {
+      break;
+    }
+
+    if (binding->HasFilteredInsertionPoints()) {
+      *aMulti = true;
+      return nullptr;
+    }
+
+    XBLChildrenElement* point = binding->GetDefaultInsertionPoint();
+    if (!point) {
+      return nullptr;
+    }
+
+    nsIContent* newParent = point->GetParent();
+    if (newParent == parent) {
+      break;
+    }
+    parent = newParent;
+  }
+
+  return parent;
+}
diff --git a/dom/xbl/nsBindingManager.h b/dom/xbl/nsBindingManager.h
new file mode 100644
index 0000000000..a71ff21887
--- /dev/null
+++ b/dom/xbl/nsBindingManager.h
@@ -0,0 +1,235 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsBindingManager_h_
+#define nsBindingManager_h_
+
+#include "nsAutoPtr.h"
+#include "nsIContent.h"
+#include "nsStubMutationObserver.h"
+#include "nsHashKeys.h"
+#include "nsInterfaceHashtable.h"
+#include "nsRefPtrHashtable.h"
+#include "nsURIHashKey.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsXBLBinding.h"
+#include "nsTArray.h"
+#include "nsThreadUtils.h"
+#include "mozilla/StyleSheet.h"
+
+struct ElementDependentRuleProcessorData;
+class nsIXPConnectWrappedJS;
+class nsIAtom;
+class nsIDOMNodeList;
+class nsIDocument;
+class nsIURI;
+class nsXBLDocumentInfo;
+class nsIStreamListener;
+class nsXBLBinding;
+typedef nsTArray<RefPtr<nsXBLBinding> > nsBindingList;
+class nsIPrincipal;
+class nsITimer;
+
+class nsBindingManager final : public nsStubMutationObserver
+{
+  ~nsBindingManager();
+
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+
+  explicit nsBindingManager(nsIDocument* aDocument);
+
+  nsXBLBinding* GetBindingWithContent(const nsIContent* aContent);
+
+  void AddBoundContent(nsIContent* aContent);
+  void RemoveBoundContent(nsIContent* aContent);
+
+  /**
+   * Notify the binding manager that an element
+   * has been removed from its document,
+   * so that it can update any bindings or
+   * nsIAnonymousContentCreator-created anonymous
+   * content that may depend on the document.
+   * @param aContent the element that's being moved
+   * @param aOldDocument the old document in which the
+   *   content resided.
+   * @param aDestructorHandling whether or not to run the possible XBL
+   *        destructor.
+   */
+
+ enum DestructorHandling {
+   eRunDtor,
+   eDoNotRunDtor
+ };
+  void RemovedFromDocument(nsIContent* aContent, nsIDocument* aOldDocument,
+                           DestructorHandling aDestructorHandling)
+  {
+    if (aContent->HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
+      RemovedFromDocumentInternal(aContent, aOldDocument, aDestructorHandling);
+    }
+  }
+  void RemovedFromDocumentInternal(nsIContent* aContent,
+                                   nsIDocument* aOldDocument,
+                                   DestructorHandling aDestructorHandling);
+
+  nsIAtom* ResolveTag(nsIContent* aContent, int32_t* aNameSpaceID);
+
+  /**
+   * Return the nodelist of "anonymous" kids for this node.  This might
+   * actually include some of the nodes actual DOM kids, if there are
+   * <children> tags directly as kids of <content>.  This will only end up
+   * returning a non-null list for nodes which have a binding attached.
+   */
+  nsresult GetAnonymousNodesFor(nsIContent* aContent, nsIDOMNodeList** aResult);
+  nsINodeList* GetAnonymousNodesFor(nsIContent* aContent);
+
+  nsresult ClearBinding(nsIContent* aContent);
+  nsresult LoadBindingDocument(nsIDocument* aBoundDoc, nsIURI* aURL,
+                               nsIPrincipal* aOriginPrincipal);
+
+  nsresult AddToAttachedQueue(nsXBLBinding* aBinding);
+  void RemoveFromAttachedQueue(nsXBLBinding* aBinding);
+  void ProcessAttachedQueue(uint32_t aSkipSize = 0)
+  {
+    if (mProcessingAttachedStack || mAttachedStack.Length() <= aSkipSize) {
+      return;
+    }
+
+    ProcessAttachedQueueInternal(aSkipSize);
+  }
+private:
+  void ProcessAttachedQueueInternal(uint32_t aSkipSize);
+
+public:
+
+  void ExecuteDetachedHandlers();
+
+  nsresult PutXBLDocumentInfo(nsXBLDocumentInfo* aDocumentInfo);
+  nsXBLDocumentInfo* GetXBLDocumentInfo(nsIURI* aURI);
+  void RemoveXBLDocumentInfo(nsXBLDocumentInfo* aDocumentInfo);
+
+  nsresult PutLoadingDocListener(nsIURI* aURL, nsIStreamListener* aListener);
+  nsIStreamListener* GetLoadingDocListener(nsIURI* aURL);
+  void RemoveLoadingDocListener(nsIURI* aURL);
+
+  void FlushSkinBindings();
+
+  nsresult GetBindingImplementation(nsIContent* aContent, REFNSIID aIID, void** aResult);
+
+  // Style rule methods
+  nsresult WalkRules(nsIStyleRuleProcessor::EnumFunc aFunc,
+                     ElementDependentRuleProcessorData* aData,
+                     bool* aCutOffInheritance);
+
+  void WalkAllRules(nsIStyleRuleProcessor::EnumFunc aFunc,
+                    ElementDependentRuleProcessorData* aData);
+  /**
+   * Do any processing that needs to happen as a result of a change in
+   * the characteristics of the medium, and return whether this rule
+   * processor's rules have changed (e.g., because of media queries).
+   */
+  nsresult MediumFeaturesChanged(nsPresContext* aPresContext,
+                                 bool* aRulesChanged);
+
+  void AppendAllSheets(nsTArray<mozilla::StyleSheet*>& aArray);
+
+  void Traverse(nsIContent *aContent,
+                            nsCycleCollectionTraversalCallback &cb);
+
+  NS_DECL_CYCLE_COLLECTION_CLASS(nsBindingManager)
+
+  // Notify the binding manager when an outermost update begins and
+  // ends.  The end method can execute script.
+  void BeginOutermostUpdate()
+  {
+    mAttachedStackSizeOnOutermost = mAttachedStack.Length();
+  }
+
+  void EndOutermostUpdate()
+  {
+    if (!mProcessingAttachedStack) {
+      ProcessAttachedQueue(mAttachedStackSizeOnOutermost);
+      mAttachedStackSizeOnOutermost = 0;
+    }
+  }
+
+  // When removing an insertion point or a parent of one, clear the insertion
+  // points and their insertion parents.
+  void ClearInsertionPointsRecursively(nsIContent* aContent);
+
+  // Called when the document is going away
+  void DropDocumentReference();
+
+  nsIContent* FindNestedInsertionPoint(nsIContent* aContainer,
+                                       nsIContent* aChild);
+
+  nsIContent* FindNestedSingleInsertionPoint(nsIContent* aContainer, bool* aMulti);
+
+protected:
+  nsIXPConnectWrappedJS* GetWrappedJS(nsIContent* aContent);
+  nsresult SetWrappedJS(nsIContent* aContent, nsIXPConnectWrappedJS* aResult);
+
+  // Called by ContentAppended and ContentInserted to handle a single child
+  // insertion.  aChild must not be null.  aContainer may be null.
+  // aIndexInContainer is the index of the child in the parent.  aAppend is
+  // true if this child is being appended, not inserted.
+  void HandleChildInsertion(nsIContent* aContainer, nsIContent* aChild,
+                            uint32_t aIndexInContainer, bool aAppend);
+
+  // Same as ProcessAttachedQueue, but also nulls out
+  // mProcessAttachedQueueEvent
+  void DoProcessAttachedQueue();
+
+  // Post an event to process the attached queue.
+  void PostProcessAttachedQueueEvent();
+
+  // Call PostProcessAttachedQueueEvent() on a timer.
+  static void PostPAQEventCallback(nsITimer* aTimer, void* aClosure);
+
+// MEMBER VARIABLES
+protected:
+  // A set of nsIContent that currently have a binding installed.
+  nsAutoPtr<nsTHashtable<nsRefPtrHashKey<nsIContent> > > mBoundContentSet;
+
+  // A mapping from nsIContent* to nsIXPWrappedJS* (an XPConnect
+  // wrapper for JS objects).  For XBL bindings that implement XPIDL
+  // interfaces, and that get referred to from C++, this table caches
+  // the XPConnect wrapper for the binding.  By caching it, I control
+  // its lifetime, and I prevent a re-wrap of the same script object
+  // (in the case where multiple bindings in an XBL inheritance chain
+  // both implement an XPIDL interface).
+  typedef nsInterfaceHashtable<nsISupportsHashKey, nsIXPConnectWrappedJS> WrapperHashtable;
+  nsAutoPtr<WrapperHashtable> mWrapperTable;
+
+  // A mapping from a URL (a string) to nsXBLDocumentInfo*.  This table
+  // is the cache of all binding documents that have been loaded by a
+  // given bound document.
+  nsAutoPtr<nsRefPtrHashtable<nsURIHashKey,nsXBLDocumentInfo> > mDocumentTable;
+
+  // A mapping from a URL (a string) to a nsIStreamListener. This
+  // table is the currently loading binding docs.  If they're in this
+  // table, they have not yet finished loading.
+  nsAutoPtr<nsInterfaceHashtable<nsURIHashKey,nsIStreamListener> > mLoadingDocTable;
+
+  // A queue of binding attached event handlers that are awaiting execution.
+  nsBindingList mAttachedStack;
+  bool mProcessingAttachedStack;
+  bool mDestroyed;
+  uint32_t mAttachedStackSizeOnOutermost;
+
+  // Our posted event to process the attached queue, if any
+  friend class nsRunnableMethod<nsBindingManager>;
+  RefPtr< nsRunnableMethod<nsBindingManager> > mProcessAttachedQueueEvent;
+
+  // Our document.  This is a weak ref; the document owns us
+  nsIDocument* mDocument;
+};
+
+#endif
diff --git a/dom/xbl/nsXBLBinding.cpp b/dom/xbl/nsXBLBinding.cpp
new file mode 100644
index 0000000000..6ae17c4c02
--- /dev/null
+++ b/dom/xbl/nsXBLBinding.cpp
@@ -0,0 +1,1247 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsCOMPtr.h"
+#include "nsIAtom.h"
+#include "nsXBLDocumentInfo.h"
+#include "nsIInputStream.h"
+#include "nsNameSpaceManager.h"
+#include "nsIURI.h"
+#include "nsIURL.h"
+#include "nsIChannel.h"
+#include "nsXPIDLString.h"
+#include "nsReadableUtils.h"
+#include "plstr.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsContentUtils.h"
+#include "ChildIterator.h"
+#ifdef MOZ_XUL
+#include "nsIXULDocument.h"
+#endif
+#include "nsIXMLContentSink.h"
+#include "nsContentCID.h"
+#include "mozilla/dom/XMLDocument.h"
+#include "jsapi.h"
+#include "nsXBLService.h"
+#include "nsIXPConnect.h"
+#include "nsIScriptContext.h"
+#include "nsCRT.h"
+
+// Event listeners
+#include "mozilla/EventListenerManager.h"
+#include "nsIDOMEventListener.h"
+#include "nsAttrName.h"
+
+#include "nsGkAtoms.h"
+
+#include "nsXBLPrototypeHandler.h"
+
+#include "nsXBLPrototypeBinding.h"
+#include "nsXBLBinding.h"
+#include "nsIPrincipal.h"
+#include "nsIScriptSecurityManager.h"
+#include "mozilla/dom/XBLChildrenElement.h"
+
+#include "prprf.h"
+#include "nsNodeUtils.h"
+#include "nsJSUtils.h"
+
+// Nasty hack.  Maybe we could move some of the classinfo utility methods
+// (e.g. WrapNative) over to nsContentUtils?
+#include "nsDOMClassInfo.h"
+
+#include "mozilla/DeferredFinalize.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/ShadowRoot.h"
+#include "mozilla/ServoStyleSet.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+// Helper classes
+
+/***********************************************************************/
+//
+// The JS class for XBLBinding
+//
+static void
+XBLFinalize(JSFreeOp *fop, JSObject *obj)
+{
+  nsXBLDocumentInfo* docInfo =
+    static_cast<nsXBLDocumentInfo*>(::JS_GetPrivate(obj));
+  DeferredFinalize(docInfo);
+}
+
+static bool
+XBLEnumerate(JSContext *cx, JS::Handle<JSObject*> obj)
+{
+  nsXBLPrototypeBinding* protoBinding =
+    static_cast<nsXBLPrototypeBinding*>(::JS_GetReservedSlot(obj, 0).toPrivate());
+  MOZ_ASSERT(protoBinding);
+
+  return protoBinding->ResolveAllFields(cx, obj);
+}
+
+static const JSClassOps gPrototypeJSClassOps = {
+    nullptr, nullptr, nullptr, nullptr,
+    XBLEnumerate, nullptr,
+    nullptr, XBLFinalize,
+    nullptr, nullptr, nullptr, nullptr
+};
+
+static const JSClass gPrototypeJSClass = {
+    "XBL prototype JSClass",
+    JSCLASS_HAS_PRIVATE |
+    JSCLASS_PRIVATE_IS_NSISUPPORTS |
+    JSCLASS_FOREGROUND_FINALIZE |
+    // Our one reserved slot holds the relevant nsXBLPrototypeBinding
+    JSCLASS_HAS_RESERVED_SLOTS(1),
+    &gPrototypeJSClassOps
+};
+
+// Implementation /////////////////////////////////////////////////////////////////
+
+// Constructors/Destructors
+nsXBLBinding::nsXBLBinding(nsXBLPrototypeBinding* aBinding)
+  : mMarkedForDeath(false)
+  , mUsingContentXBLScope(false)
+  , mIsShadowRootBinding(false)
+  , mPrototypeBinding(aBinding)
+{
+  NS_ASSERTION(mPrototypeBinding, "Must have a prototype binding!");
+  // Grab a ref to the document info so the prototype binding won't die
+  NS_ADDREF(mPrototypeBinding->XBLDocumentInfo());
+}
+
+// Constructor used by web components.
+nsXBLBinding::nsXBLBinding(ShadowRoot* aShadowRoot, nsXBLPrototypeBinding* aBinding)
+  : mMarkedForDeath(false),
+    mUsingContentXBLScope(false),
+    mIsShadowRootBinding(true),
+    mPrototypeBinding(aBinding),
+    mContent(aShadowRoot)
+{
+  NS_ASSERTION(mPrototypeBinding, "Must have a prototype binding!");
+  // Grab a ref to the document info so the prototype binding won't die
+  NS_ADDREF(mPrototypeBinding->XBLDocumentInfo());
+}
+
+nsXBLBinding::~nsXBLBinding(void)
+{
+  if (mContent && !mIsShadowRootBinding) {
+    // It is unnecessary to uninstall anonymous content in a shadow tree
+    // because the ShadowRoot itself is a DocumentFragment and does not
+    // need any additional cleanup.
+    nsXBLBinding::UninstallAnonymousContent(mContent->OwnerDoc(), mContent);
+  }
+  nsXBLDocumentInfo* info = mPrototypeBinding->XBLDocumentInfo();
+  NS_RELEASE(info);
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsXBLBinding)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXBLBinding)
+  // XXX Probably can't unlink mPrototypeBinding->XBLDocumentInfo(), because
+  //     mPrototypeBinding is weak.
+  if (tmp->mContent && !tmp->mIsShadowRootBinding) {
+    nsXBLBinding::UninstallAnonymousContent(tmp->mContent->OwnerDoc(),
+                                            tmp->mContent);
+  }
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mContent)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mNextBinding)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDefaultInsertionPoint)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mInsertionPoints)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnonymousContentList)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLBinding)
+  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb,
+                                     "mPrototypeBinding->XBLDocumentInfo()");
+  cb.NoteXPCOMChild(tmp->mPrototypeBinding->XBLDocumentInfo());
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNextBinding)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDefaultInsertionPoint)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInsertionPoints)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAnonymousContentList)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(nsXBLBinding, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(nsXBLBinding, Release)
+
+void
+nsXBLBinding::SetBaseBinding(nsXBLBinding* aBinding)
+{
+  if (mNextBinding) {
+    NS_ERROR("Base XBL binding is already defined!");
+    return;
+  }
+
+  mNextBinding = aBinding; // Comptr handles rel/add
+}
+
+nsXBLBinding*
+nsXBLBinding::GetBindingWithContent()
+{
+  if (mContent) {
+    return this;
+  }
+
+  return mNextBinding ? mNextBinding->GetBindingWithContent() : nullptr;
+}
+
+void
+nsXBLBinding::InstallAnonymousContent(nsIContent* aAnonParent, nsIContent* aElement,
+                                      bool aChromeOnlyContent)
+{
+  // We need to ensure two things.
+  // (1) The anonymous content should be fooled into thinking it's in the bound
+  // element's document, assuming that the bound element is in a document
+  // Note that we don't change the current doc of aAnonParent here, since that
+  // quite simply does not matter.  aAnonParent is just a way of keeping refs
+  // to all its kids, which are anonymous content from the point of view of
+  // aElement.
+  // (2) The children's parent back pointer should not be to this synthetic root
+  // but should instead point to the enclosing parent element.
+  nsIDocument* doc = aElement->GetUncomposedDoc();
+  bool allowScripts = AllowScripts();
+
+  nsAutoScriptBlocker scriptBlocker;
+  for (nsIContent* child = aAnonParent->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    child->UnbindFromTree();
+    if (aChromeOnlyContent) {
+      child->SetFlags(NODE_CHROME_ONLY_ACCESS |
+                      NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS);
+    }
+    nsresult rv =
+      child->BindToTree(doc, aElement, mBoundElement, allowScripts);
+    if (NS_FAILED(rv)) {
+      // Oh, well... Just give up.
+      // XXXbz This really shouldn't be a void method!
+      child->UnbindFromTree();
+      return;
+    }
+
+    child->SetFlags(NODE_IS_ANONYMOUS_ROOT);
+
+#ifdef MOZ_XUL
+    // To make XUL templates work (and other goodies that happen when
+    // an element is added to a XUL document), we need to notify the
+    // XUL document using its special API.
+    nsCOMPtr<nsIXULDocument> xuldoc(do_QueryInterface(doc));
+    if (xuldoc)
+      xuldoc->AddSubtreeToDocument(child);
+#endif
+  }
+}
+
+void
+nsXBLBinding::UninstallAnonymousContent(nsIDocument* aDocument,
+                                        nsIContent* aAnonParent)
+{
+  nsAutoScriptBlocker scriptBlocker;
+  // Hold a strong ref while doing this, just in case.
+  nsCOMPtr<nsIContent> anonParent = aAnonParent;
+#ifdef MOZ_XUL
+  nsCOMPtr<nsIXULDocument> xuldoc =
+    do_QueryInterface(aDocument);
+#endif
+  for (nsIContent* child = aAnonParent->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    child->UnbindFromTree();
+#ifdef MOZ_XUL
+    if (xuldoc) {
+      xuldoc->RemoveSubtreeFromDocument(child);
+    }
+#endif
+  }
+}
+
+void
+nsXBLBinding::SetBoundElement(nsIContent* aElement)
+{
+  mBoundElement = aElement;
+  if (mNextBinding)
+    mNextBinding->SetBoundElement(aElement);
+
+  if (!mBoundElement) {
+    return;
+  }
+
+  // Compute whether we're using an XBL scope.
+  //
+  // We disable XBL scopes for remote XUL, where we care about compat more
+  // than security. So we need to know whether we're using an XBL scope so that
+  // we can decide what to do about untrusted events when "allowuntrusted"
+  // is not given in the handler declaration.
+  nsCOMPtr<nsIGlobalObject> go = mBoundElement->OwnerDoc()->GetScopeObject();
+  NS_ENSURE_TRUE_VOID(go && go->GetGlobalJSObject());
+  mUsingContentXBLScope = xpc::UseContentXBLScope(js::GetObjectCompartment(go->GetGlobalJSObject()));
+}
+
+bool
+nsXBLBinding::HasStyleSheets() const
+{
+  // Find out if we need to re-resolve style.  We'll need to do this
+  // if we have additional stylesheets in our binding document.
+  if (mPrototypeBinding->HasStyleSheets())
+    return true;
+
+  return mNextBinding ? mNextBinding->HasStyleSheets() : false;
+}
+
+void
+nsXBLBinding::GenerateAnonymousContent()
+{
+  NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
+               "Someone forgot a script blocker");
+
+  // Fetch the content element for this binding.
+  nsIContent* content =
+    mPrototypeBinding->GetImmediateChild(nsGkAtoms::content);
+
+  if (!content) {
+    // We have no anonymous content.
+    if (mNextBinding)
+      mNextBinding->GenerateAnonymousContent();
+
+    return;
+  }
+
+  // Find out if we're really building kids or if we're just
+  // using the attribute-setting shorthand hack.
+  uint32_t contentCount = content->GetChildCount();
+
+  // Plan to build the content by default.
+  bool hasContent = (contentCount > 0);
+  if (hasContent) {
+    nsIDocument* doc = mBoundElement->OwnerDoc();
+
+    nsCOMPtr<nsINode> clonedNode;
+    nsCOMArray<nsINode> nodesWithProperties;
+    nsNodeUtils::Clone(content, true, doc->NodeInfoManager(),
+                       nodesWithProperties, getter_AddRefs(clonedNode));
+    mContent = clonedNode->AsElement();
+
+    // Search for <xbl:children> elements in the XBL content. In the presence
+    // of multiple default insertion points, we use the last one in document
+    // order.
+    for (nsIContent* child = mContent; child; child = child->GetNextNode(mContent)) {
+      if (child->NodeInfo()->Equals(nsGkAtoms::children, kNameSpaceID_XBL)) {
+        XBLChildrenElement* point = static_cast<XBLChildrenElement*>(child);
+        if (point->IsDefaultInsertion()) {
+          mDefaultInsertionPoint = point;
+        } else {
+          mInsertionPoints.AppendElement(point);
+        }
+      }
+    }
+
+    // Do this after looking for <children> as this messes up the parent
+    // pointer which would make the GetNextNode call above fail
+    InstallAnonymousContent(mContent, mBoundElement,
+                            mPrototypeBinding->ChromeOnlyContent());
+
+    // Insert explicit children into insertion points
+    if (mDefaultInsertionPoint && mInsertionPoints.IsEmpty()) {
+      ExplicitChildIterator iter(mBoundElement);
+      for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
+        mDefaultInsertionPoint->AppendInsertedChild(child);
+      }
+    } else {
+      // It is odd to come into this code if mInsertionPoints is not empty, but
+      // we need to make sure to do the compatibility hack below if the bound
+      // node has any non <xul:template> or <xul:observes> children.
+      ExplicitChildIterator iter(mBoundElement);
+      for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
+        XBLChildrenElement* point = FindInsertionPointForInternal(child);
+        if (point) {
+          point->AppendInsertedChild(child);
+        } else {
+          NodeInfo *ni = child->NodeInfo();
+          if (ni->NamespaceID() != kNameSpaceID_XUL ||
+              (!ni->Equals(nsGkAtoms::_template) &&
+               !ni->Equals(nsGkAtoms::observes))) {
+            // Compatibility hack. For some reason the original XBL
+            // implementation dropped the content of a binding if any child of
+            // the bound element didn't match any of the <children> in the
+            // binding. This became a pseudo-API that we have to maintain.
+
+            // Undo InstallAnonymousContent
+            UninstallAnonymousContent(doc, mContent);
+
+            // Clear out our children elements to avoid dangling references.
+            ClearInsertionPoints();
+
+            // Pretend as though there was no content in the binding.
+            mContent = nullptr;
+            return;
+          }
+        }
+      }
+    }
+
+    // Set binding parent on default content if need
+    if (mDefaultInsertionPoint) {
+      mDefaultInsertionPoint->MaybeSetupDefaultContent();
+    }
+    for (uint32_t i = 0; i < mInsertionPoints.Length(); ++i) {
+      mInsertionPoints[i]->MaybeSetupDefaultContent();
+    }
+
+    mPrototypeBinding->SetInitialAttributes(mBoundElement, mContent);
+  }
+
+  // Always check the content element for potential attributes.
+  // This shorthand hack always happens, even when we didn't
+  // build anonymous content.
+  BorrowedAttrInfo attrInfo;
+  for (uint32_t i = 0; (attrInfo = content->GetAttrInfoAt(i)); ++i) {
+    int32_t namespaceID = attrInfo.mName->NamespaceID();
+    // Hold a strong reference here so that the atom doesn't go away during
+    // UnsetAttr.
+    nsCOMPtr<nsIAtom> name = attrInfo.mName->LocalName();
+
+    if (name != nsGkAtoms::includes) {
+      if (!nsContentUtils::HasNonEmptyAttr(mBoundElement, namespaceID, name)) {
+        nsAutoString value2;
+        attrInfo.mValue->ToString(value2);
+        mBoundElement->SetAttr(namespaceID, name, attrInfo.mName->GetPrefix(),
+                               value2, false);
+      }
+    }
+
+    // Conserve space by wiping the attributes off the clone.
+    if (mContent)
+      mContent->UnsetAttr(namespaceID, name, false);
+  }
+
+  // Now that we've finished shuffling the tree around, go ahead and restyle it
+  // since frame construction is about to happen.
+  nsIPresShell* presShell = mBoundElement->OwnerDoc()->GetShell();
+  ServoStyleSet* servoSet = presShell->StyleSet()->GetAsServo();
+  if (servoSet) {
+    mBoundElement->SetHasDirtyDescendantsForServo();
+    servoSet->StyleNewChildren(mBoundElement);
+  }
+}
+
+nsIURI*
+nsXBLBinding::GetSourceDocURI()
+{
+  nsIContent* targetContent =
+    mPrototypeBinding->GetImmediateChild(nsGkAtoms::content);
+  if (!targetContent) {
+    return nullptr;
+  }
+
+  return targetContent->OwnerDoc()->GetDocumentURI();
+}
+
+XBLChildrenElement*
+nsXBLBinding::FindInsertionPointFor(nsIContent* aChild)
+{
+  // XXX We should get rid of this function as it causes us to traverse the
+  // binding chain multiple times
+  if (mContent) {
+    return FindInsertionPointForInternal(aChild);
+  }
+
+  return mNextBinding ? mNextBinding->FindInsertionPointFor(aChild)
+                      : nullptr;
+}
+
+XBLChildrenElement*
+nsXBLBinding::FindInsertionPointForInternal(nsIContent* aChild)
+{
+  for (uint32_t i = 0; i < mInsertionPoints.Length(); ++i) {
+    XBLChildrenElement* point = mInsertionPoints[i];
+    if (point->Includes(aChild)) {
+      return point;
+    }
+  }
+
+  return mDefaultInsertionPoint;
+}
+
+void
+nsXBLBinding::ClearInsertionPoints()
+{
+  if (mDefaultInsertionPoint) {
+    mDefaultInsertionPoint->ClearInsertedChildren();
+  }
+
+  for (uint32_t i = 0; i < mInsertionPoints.Length(); ++i) {
+    mInsertionPoints[i]->ClearInsertedChildren();
+  }
+}
+
+nsAnonymousContentList*
+nsXBLBinding::GetAnonymousNodeList()
+{
+  if (!mContent) {
+    return mNextBinding ? mNextBinding->GetAnonymousNodeList() : nullptr;
+  }
+
+  if (!mAnonymousContentList) {
+    mAnonymousContentList = new nsAnonymousContentList(mContent);
+  }
+
+  return mAnonymousContentList;
+}
+
+void
+nsXBLBinding::InstallEventHandlers()
+{
+  // Don't install handlers if scripts aren't allowed.
+  if (AllowScripts()) {
+    // Fetch the handlers prototypes for this binding.
+    nsXBLPrototypeHandler* handlerChain = mPrototypeBinding->GetPrototypeHandlers();
+
+    if (handlerChain) {
+      EventListenerManager* manager = mBoundElement->GetOrCreateListenerManager();
+      if (!manager)
+        return;
+
+      bool isChromeDoc =
+        nsContentUtils::IsChromeDoc(mBoundElement->OwnerDoc());
+      bool isChromeBinding = mPrototypeBinding->IsChrome();
+      nsXBLPrototypeHandler* curr;
+      for (curr = handlerChain; curr; curr = curr->GetNextHandler()) {
+        // Fetch the event type.
+        nsCOMPtr<nsIAtom> eventAtom = curr->GetEventName();
+        if (!eventAtom ||
+            eventAtom == nsGkAtoms::keyup ||
+            eventAtom == nsGkAtoms::keydown ||
+            eventAtom == nsGkAtoms::keypress)
+          continue;
+
+        nsXBLEventHandler* handler = curr->GetEventHandler();
+        if (handler) {
+          // Figure out if we're using capturing or not.
+          EventListenerFlags flags;
+          flags.mCapture = (curr->GetPhase() == NS_PHASE_CAPTURING);
+
+          // If this is a command, add it in the system event group
+          if ((curr->GetType() & (NS_HANDLER_TYPE_XBL_COMMAND |
+                                  NS_HANDLER_TYPE_SYSTEM)) &&
+              (isChromeBinding || mBoundElement->IsInNativeAnonymousSubtree())) {
+            flags.mInSystemGroup = true;
+          }
+
+          bool hasAllowUntrustedAttr = curr->HasAllowUntrustedAttr();
+          if ((hasAllowUntrustedAttr && curr->AllowUntrustedEvents()) ||
+              (!hasAllowUntrustedAttr && !isChromeDoc && !mUsingContentXBLScope)) {
+            flags.mAllowUntrustedEvents = true;
+          }
+
+          manager->AddEventListenerByType(handler,
+                                          nsDependentAtomString(eventAtom),
+                                          flags);
+        }
+      }
+
+      const nsCOMArray<nsXBLKeyEventHandler>* keyHandlers =
+        mPrototypeBinding->GetKeyEventHandlers();
+      int32_t i;
+      for (i = 0; i < keyHandlers->Count(); ++i) {
+        nsXBLKeyEventHandler* handler = keyHandlers->ObjectAt(i);
+        handler->SetIsBoundToChrome(isChromeDoc);
+        handler->SetUsingContentXBLScope(mUsingContentXBLScope);
+
+        nsAutoString type;
+        handler->GetEventName(type);
+
+        // If this is a command, add it in the system event group, otherwise
+        // add it to the standard event group.
+
+        // Figure out if we're using capturing or not.
+        EventListenerFlags flags;
+        flags.mCapture = (handler->GetPhase() == NS_PHASE_CAPTURING);
+
+        if ((handler->GetType() & (NS_HANDLER_TYPE_XBL_COMMAND |
+                                   NS_HANDLER_TYPE_SYSTEM)) &&
+            (isChromeBinding || mBoundElement->IsInNativeAnonymousSubtree())) {
+          flags.mInSystemGroup = true;
+        }
+
+        // For key handlers we have to set mAllowUntrustedEvents flag.
+        // Whether the handling of the event is allowed or not is handled in
+        // nsXBLKeyEventHandler::HandleEvent
+        flags.mAllowUntrustedEvents = true;
+
+        manager->AddEventListenerByType(handler, type, flags);
+      }
+    }
+  }
+
+  if (mNextBinding)
+    mNextBinding->InstallEventHandlers();
+}
+
+nsresult
+nsXBLBinding::InstallImplementation()
+{
+  // Always install the base class properties first, so that
+  // derived classes can reference the base class properties.
+
+  if (mNextBinding) {
+    nsresult rv = mNextBinding->InstallImplementation();
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // iterate through each property in the prototype's list and install the property.
+  if (AllowScripts())
+    return mPrototypeBinding->InstallImplementation(this);
+
+  return NS_OK;
+}
+
+nsIAtom*
+nsXBLBinding::GetBaseTag(int32_t* aNameSpaceID)
+{
+  nsIAtom *tag = mPrototypeBinding->GetBaseTag(aNameSpaceID);
+  if (!tag && mNextBinding)
+    return mNextBinding->GetBaseTag(aNameSpaceID);
+
+  return tag;
+}
+
+void
+nsXBLBinding::AttributeChanged(nsIAtom* aAttribute, int32_t aNameSpaceID,
+                               bool aRemoveFlag, bool aNotify)
+{
+  // XXX Change if we ever allow multiple bindings in a chain to contribute anonymous content
+  if (!mContent) {
+    if (mNextBinding)
+      mNextBinding->AttributeChanged(aAttribute, aNameSpaceID,
+                                     aRemoveFlag, aNotify);
+  } else {
+    mPrototypeBinding->AttributeChanged(aAttribute, aNameSpaceID, aRemoveFlag,
+                                        mBoundElement, mContent, aNotify);
+  }
+}
+
+void
+nsXBLBinding::ExecuteAttachedHandler()
+{
+  if (mNextBinding)
+    mNextBinding->ExecuteAttachedHandler();
+
+  if (AllowScripts())
+    mPrototypeBinding->BindingAttached(mBoundElement);
+}
+
+void
+nsXBLBinding::ExecuteDetachedHandler()
+{
+  if (AllowScripts())
+    mPrototypeBinding->BindingDetached(mBoundElement);
+
+  if (mNextBinding)
+    mNextBinding->ExecuteDetachedHandler();
+}
+
+void
+nsXBLBinding::UnhookEventHandlers()
+{
+  nsXBLPrototypeHandler* handlerChain = mPrototypeBinding->GetPrototypeHandlers();
+
+  if (handlerChain) {
+    EventListenerManager* manager = mBoundElement->GetExistingListenerManager();
+    if (!manager) {
+      return;
+    }
+
+    bool isChromeBinding = mPrototypeBinding->IsChrome();
+    nsXBLPrototypeHandler* curr;
+    for (curr = handlerChain; curr; curr = curr->GetNextHandler()) {
+      nsXBLEventHandler* handler = curr->GetCachedEventHandler();
+      if (!handler) {
+        continue;
+      }
+
+      nsCOMPtr<nsIAtom> eventAtom = curr->GetEventName();
+      if (!eventAtom ||
+          eventAtom == nsGkAtoms::keyup ||
+          eventAtom == nsGkAtoms::keydown ||
+          eventAtom == nsGkAtoms::keypress)
+        continue;
+
+      // Figure out if we're using capturing or not.
+      EventListenerFlags flags;
+      flags.mCapture = (curr->GetPhase() == NS_PHASE_CAPTURING);
+
+      // If this is a command, remove it from the system event group,
+      // otherwise remove it from the standard event group.
+
+      if ((curr->GetType() & (NS_HANDLER_TYPE_XBL_COMMAND |
+                              NS_HANDLER_TYPE_SYSTEM)) &&
+          (isChromeBinding || mBoundElement->IsInNativeAnonymousSubtree())) {
+        flags.mInSystemGroup = true;
+      }
+
+      manager->RemoveEventListenerByType(handler,
+                                         nsDependentAtomString(eventAtom),
+                                         flags);
+    }
+
+    const nsCOMArray<nsXBLKeyEventHandler>* keyHandlers =
+      mPrototypeBinding->GetKeyEventHandlers();
+    int32_t i;
+    for (i = 0; i < keyHandlers->Count(); ++i) {
+      nsXBLKeyEventHandler* handler = keyHandlers->ObjectAt(i);
+
+      nsAutoString type;
+      handler->GetEventName(type);
+
+      // Figure out if we're using capturing or not.
+      EventListenerFlags flags;
+      flags.mCapture = (handler->GetPhase() == NS_PHASE_CAPTURING);
+
+      // If this is a command, remove it from the system event group, otherwise
+      // remove it from the standard event group.
+
+      if ((handler->GetType() & (NS_HANDLER_TYPE_XBL_COMMAND | NS_HANDLER_TYPE_SYSTEM)) &&
+          (isChromeBinding || mBoundElement->IsInNativeAnonymousSubtree())) {
+        flags.mInSystemGroup = true;
+      }
+
+      manager->RemoveEventListenerByType(handler, type, flags);
+    }
+  }
+}
+
+static void
+UpdateInsertionParent(XBLChildrenElement* aPoint,
+                      nsIContent* aOldBoundElement)
+{
+  if (aPoint->IsDefaultInsertion()) {
+    return;
+  }
+
+  for (size_t i = 0; i < aPoint->InsertedChildrenLength(); ++i) {
+    nsIContent* child = aPoint->InsertedChild(i);
+
+    MOZ_ASSERT(child->GetParentNode());
+
+    // Here, we're iterating children that we inserted. There are two cases:
+    // either |child| is an explicit child of |aOldBoundElement| and is no
+    // longer inserted anywhere or it's a child of a <children> element
+    // parented to |aOldBoundElement|. In the former case, the child is no
+    // longer inserted anywhere, so we set its insertion parent to null. In the
+    // latter case, the child is now inserted into |aOldBoundElement| from some
+    // binding above us, so we set its insertion parent to aOldBoundElement.
+    if (child->GetParentNode() == aOldBoundElement) {
+      child->SetXBLInsertionParent(nullptr);
+    } else {
+      child->SetXBLInsertionParent(aOldBoundElement);
+    }
+  }
+}
+
+void
+nsXBLBinding::ChangeDocument(nsIDocument* aOldDocument, nsIDocument* aNewDocument)
+{
+  if (aOldDocument == aNewDocument)
+    return;
+
+  // Now the binding dies.  Unhook our prototypes.
+  if (mPrototypeBinding->HasImplementation()) {
+    AutoJSAPI jsapi;
+    // Init might fail here if we've cycle-collected the global object, since
+    // the Unlink phase of cycle collection happens after JS GC finalization.
+    // But in that case, we don't care about fixing the prototype chain, since
+    // everything's going away immediately.
+    if (jsapi.Init(aOldDocument->GetScopeObject())) {
+      JSContext* cx = jsapi.cx();
+
+      JS::Rooted<JSObject*> scriptObject(cx, mBoundElement->GetWrapper());
+      if (scriptObject) {
+        // XXX Stay in sync! What if a layered binding has an
+        // <interface>?!
+        // XXXbz what does that comment mean, really?  It seems to date
+        // back to when there was such a thing as an <interface>, whever
+        // that was...
+
+        // Find the right prototype.
+        JSAutoCompartment ac(cx, scriptObject);
+
+        JS::Rooted<JSObject*> base(cx, scriptObject);
+        JS::Rooted<JSObject*> proto(cx);
+        for ( ; true; base = proto) { // Will break out on null proto
+          if (!JS_GetPrototype(cx, base, &proto)) {
+            return;
+          }
+          if (!proto) {
+            break;
+          }
+
+          if (JS_GetClass(proto) != &gPrototypeJSClass) {
+            // Clearly not the right class
+            continue;
+          }
+
+          RefPtr<nsXBLDocumentInfo> docInfo =
+            static_cast<nsXBLDocumentInfo*>(::JS_GetPrivate(proto));
+          if (!docInfo) {
+            // Not the proto we seek
+            continue;
+          }
+
+          JS::Value protoBinding = ::JS_GetReservedSlot(proto, 0);
+
+          if (protoBinding.toPrivate() != mPrototypeBinding) {
+            // Not the right binding
+            continue;
+          }
+
+          // Alright!  This is the right prototype.  Pull it out of the
+          // proto chain.
+          JS::Rooted<JSObject*> grandProto(cx);
+          if (!JS_GetPrototype(cx, proto, &grandProto)) {
+            return;
+          }
+          ::JS_SetPrototype(cx, base, grandProto);
+          break;
+        }
+
+        mPrototypeBinding->UndefineFields(cx, scriptObject);
+
+        // Don't remove the reference from the document to the
+        // wrapper here since it'll be removed by the element
+        // itself when that's taken out of the document.
+      }
+    }
+  }
+
+  // Remove our event handlers
+  UnhookEventHandlers();
+
+  {
+    nsAutoScriptBlocker scriptBlocker;
+
+    // Then do our ancestors.  This reverses the construction order, so that at
+    // all times things are consistent as far as everyone is concerned.
+    if (mNextBinding) {
+      mNextBinding->ChangeDocument(aOldDocument, aNewDocument);
+    }
+
+    // Update the anonymous content.
+    // XXXbz why not only for style bindings?
+    if (mContent && !mIsShadowRootBinding) {
+      nsXBLBinding::UninstallAnonymousContent(aOldDocument, mContent);
+    }
+
+    // Now that we've unbound our anonymous content from the tree and updated
+    // its binding parent, update the insertion parent for content inserted
+    // into our <children> elements.
+    if (mDefaultInsertionPoint) {
+      UpdateInsertionParent(mDefaultInsertionPoint, mBoundElement);
+    }
+
+    for (size_t i = 0; i < mInsertionPoints.Length(); ++i) {
+      UpdateInsertionParent(mInsertionPoints[i], mBoundElement);
+    }
+
+    // Now that our inserted children no longer think they're inserted
+    // anywhere, make sure our internal state reflects that as well.
+    ClearInsertionPoints();
+  }
+}
+
+bool
+nsXBLBinding::InheritsStyle() const
+{
+  // XXX Will have to change if we ever allow multiple bindings to contribute anonymous content.
+  // Most derived binding with anonymous content determines style inheritance for now.
+
+  // XXX What about bindings with <content> but no kids, e.g., my treecell-text binding?
+  if (mContent)
+    return mPrototypeBinding->InheritsStyle();
+
+  if (mNextBinding)
+    return mNextBinding->InheritsStyle();
+
+  return true;
+}
+
+void
+nsXBLBinding::WalkRules(nsIStyleRuleProcessor::EnumFunc aFunc, void* aData)
+{
+  if (mNextBinding)
+    mNextBinding->WalkRules(aFunc, aData);
+
+  nsIStyleRuleProcessor *rules = mPrototypeBinding->GetRuleProcessor();
+  if (rules)
+    (*aFunc)(rules, aData);
+}
+
+// Internal helper methods ////////////////////////////////////////////////////////////////
+
+// Get or create a WeakMap object on a given XBL-hosting global.
+//
+// The scheme is as follows. XBL-hosting globals (either privileged content
+// Windows or XBL scopes) get two lazily-defined WeakMap properties. Each
+// WeakMap is keyed by the grand-proto - i.e. the original prototype of the
+// content before it was bound, and the prototype of the class object that we
+// splice in. The values in the WeakMap are simple dictionary-style objects,
+// mapping from XBL class names to class objects.
+static JSObject*
+GetOrCreateClassObjectMap(JSContext *cx, JS::Handle<JSObject*> scope, const char *mapName)
+{
+  AssertSameCompartment(cx, scope);
+  MOZ_ASSERT(JS_IsGlobalObject(scope));
+  MOZ_ASSERT(scope == xpc::GetXBLScopeOrGlobal(cx, scope));
+
+  // First, see if the map is already defined.
+  JS::Rooted<JS::PropertyDescriptor> desc(cx);
+  if (!JS_GetOwnPropertyDescriptor(cx, scope, mapName, &desc)) {
+    return nullptr;
+  }
+  if (desc.object() && desc.value().isObject() &&
+      JS::IsWeakMapObject(&desc.value().toObject())) {
+    return &desc.value().toObject();
+  }
+
+  // It's not there. Create and define it.
+  JS::Rooted<JSObject*> map(cx, JS::NewWeakMapObject(cx));
+  if (!map || !JS_DefineProperty(cx, scope, mapName, map,
+                                 JSPROP_PERMANENT | JSPROP_READONLY,
+                                 JS_STUBGETTER, JS_STUBSETTER))
+  {
+    return nullptr;
+  }
+  return map;
+}
+
+static JSObject*
+GetOrCreateMapEntryForPrototype(JSContext *cx, JS::Handle<JSObject*> proto)
+{
+  AssertSameCompartment(cx, proto);
+  // We want to hang our class objects off the XBL scope. But since we also
+  // hoist anonymous content into the XBL scope, this creates the potential for
+  // tricky collisions, since we can simultaneously  have a bound in-content
+  // node with grand-proto HTMLDivElement and a bound anonymous node whose
+  // grand-proto is the XBL scope's cross-compartment wrapper to HTMLDivElement.
+  // Since we have to wrap the WeakMap keys into its scope, this distinction
+  // would be lost if we don't do something about it.
+  //
+  // So we define two maps - one class objects that live in content (prototyped
+  // to content prototypes), and the other for class objects that live in the
+  // XBL scope (prototyped to cross-compartment-wrapped content prototypes).
+  const char* name = xpc::IsInContentXBLScope(proto) ? "__ContentClassObjectMap__"
+                                                     : "__XBLClassObjectMap__";
+
+  // Now, enter the XBL scope, since that's where we need to operate, and wrap
+  // the proto accordingly. We hang the map off of the content XBL scope for
+  // content, and the Window for chrome (whether add-ons are involved or not).
+  JS::Rooted<JSObject*> scope(cx, xpc::GetXBLScopeOrGlobal(cx, proto));
+  NS_ENSURE_TRUE(scope, nullptr);
+  MOZ_ASSERT(js::GetGlobalForObjectCrossCompartment(scope) == scope);
+
+  JS::Rooted<JSObject*> wrappedProto(cx, proto);
+  JSAutoCompartment ac(cx, scope);
+  if (!JS_WrapObject(cx, &wrappedProto)) {
+    return nullptr;
+  }
+
+  // Grab the appropriate WeakMap.
+  JS::Rooted<JSObject*> map(cx, GetOrCreateClassObjectMap(cx, scope, name));
+  if (!map) {
+    return nullptr;
+  }
+
+  // See if we already have a map entry for that prototype.
+  JS::Rooted<JS::Value> val(cx);
+  if (!JS::GetWeakMapEntry(cx, map, wrappedProto, &val)) {
+    return nullptr;
+  }
+  if (val.isObject()) {
+    return &val.toObject();
+  }
+
+  // We don't have an entry. Create one and stick it in the map.
+  JS::Rooted<JSObject*> entry(cx);
+  entry = JS_NewObjectWithGivenProto(cx, nullptr, nullptr);
+  if (!entry) {
+    return nullptr;
+  }
+  JS::Rooted<JS::Value> entryVal(cx, JS::ObjectValue(*entry));
+  if (!JS::SetWeakMapEntry(cx, map, wrappedProto, entryVal)) {
+    NS_WARNING("SetWeakMapEntry failed, probably due to non-preservable WeakMap "
+               "key. XBL binding will fail for this element.");
+    return nullptr;
+  }
+  return entry;
+}
+
+static
+nsXBLPrototypeBinding*
+GetProtoBindingFromClassObject(JSObject* obj)
+{
+  MOZ_ASSERT(JS_GetClass(obj) == &gPrototypeJSClass);
+  return static_cast<nsXBLPrototypeBinding*>(::JS_GetReservedSlot(obj, 0).toPrivate());
+}
+
+
+// static
+nsresult
+nsXBLBinding::DoInitJSClass(JSContext *cx,
+                            JS::Handle<JSObject*> obj,
+                            const nsAFlatString& aClassName,
+                            nsXBLPrototypeBinding* aProtoBinding,
+                            JS::MutableHandle<JSObject*> aClassObject,
+                            bool* aNew)
+{
+  MOZ_ASSERT(obj);
+
+  // Note that, now that NAC reflectors are created in the XBL scope, the
+  // reflector is not necessarily same-compartment with the document. So we'll
+  // end up creating a separate instance of the oddly-named XBL class object
+  // and defining it as a property on the XBL scope's global. This works fine,
+  // but we need to make sure never to assume that the the reflector and
+  // prototype are same-compartment with the bound document.
+  JS::Rooted<JSObject*> global(cx, js::GetGlobalForObjectCrossCompartment(obj));
+
+  // We never store class objects in add-on scopes.
+  JS::Rooted<JSObject*> xblScope(cx, xpc::GetXBLScopeOrGlobal(cx, global));
+  NS_ENSURE_TRUE(xblScope, NS_ERROR_UNEXPECTED);
+
+  JS::Rooted<JSObject*> parent_proto(cx);
+  if (!JS_GetPrototype(cx, obj, &parent_proto)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Get the map entry for the parent prototype. In the one-off case that the
+  // parent prototype is null, we somewhat hackily just use the WeakMap itself
+  // as a property holder.
+  JS::Rooted<JSObject*> holder(cx);
+  if (parent_proto) {
+    holder = GetOrCreateMapEntryForPrototype(cx, parent_proto);
+  } else {
+    JSAutoCompartment innerAC(cx, xblScope);
+    holder = GetOrCreateClassObjectMap(cx, xblScope, "__ContentClassObjectMap__");
+  }
+  if (NS_WARN_IF(!holder)) {
+    return NS_ERROR_FAILURE;
+  }
+  js::AssertSameCompartment(holder, xblScope);
+  JSAutoCompartment ac(cx, holder);
+
+  // Look up the class on the property holder. The only properties on the
+  // holder should be class objects. If we don't find the class object, we need
+  // to create and define it.
+  JS::Rooted<JSObject*> proto(cx);
+  JS::Rooted<JS::PropertyDescriptor> desc(cx);
+  if (!JS_GetOwnUCPropertyDescriptor(cx, holder, aClassName.get(), &desc)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  *aNew = !desc.object();
+  if (desc.object()) {
+    proto = &desc.value().toObject();
+    DebugOnly<nsXBLPrototypeBinding*> cachedBinding =
+      GetProtoBindingFromClassObject(js::UncheckedUnwrap(proto));
+    MOZ_ASSERT(cachedBinding == aProtoBinding);
+  } else {
+
+    // We need to create the prototype. First, enter the compartment where it's
+    // going to live, and create it.
+    JSAutoCompartment ac2(cx, global);
+    proto = JS_NewObjectWithGivenProto(cx, &gPrototypeJSClass, parent_proto);
+    if (!proto) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    // Keep this proto binding alive while we're alive.  Do this first so that
+    // we can guarantee that in XBLFinalize this will be non-null.
+    // Note that we can't just store aProtoBinding in the private and
+    // addref/release the nsXBLDocumentInfo through it, because cycle
+    // collection doesn't seem to work right if the private is not an
+    // nsISupports.
+    nsXBLDocumentInfo* docInfo = aProtoBinding->XBLDocumentInfo();
+    ::JS_SetPrivate(proto, docInfo);
+    NS_ADDREF(docInfo);
+    JS_SetReservedSlot(proto, 0, JS::PrivateValue(aProtoBinding));
+
+    // Next, enter the compartment of the property holder, wrap the proto, and
+    // stick it on.
+    JSAutoCompartment ac3(cx, holder);
+    if (!JS_WrapObject(cx, &proto) ||
+        !JS_DefineUCProperty(cx, holder, aClassName.get(), -1, proto,
+                             JSPROP_READONLY | JSPROP_PERMANENT,
+                             JS_STUBGETTER, JS_STUBSETTER))
+    {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  // Whew. We have the proto. Wrap it back into the compartment of |obj|,
+  // splice it in, and return it.
+  JSAutoCompartment ac4(cx, obj);
+  if (!JS_WrapObject(cx, &proto) || !JS_SetPrototype(cx, obj, proto)) {
+    return NS_ERROR_FAILURE;
+  }
+  aClassObject.set(proto);
+  return NS_OK;
+}
+
+bool
+nsXBLBinding::AllowScripts()
+{
+  return mBoundElement && mPrototypeBinding->GetAllowScripts();
+}
+
+nsXBLBinding*
+nsXBLBinding::RootBinding()
+{
+  if (mNextBinding)
+    return mNextBinding->RootBinding();
+
+  return this;
+}
+
+bool
+nsXBLBinding::ResolveAllFields(JSContext *cx, JS::Handle<JSObject*> obj) const
+{
+  if (!mPrototypeBinding->ResolveAllFields(cx, obj)) {
+    return false;
+  }
+
+  if (mNextBinding) {
+    return mNextBinding->ResolveAllFields(cx, obj);
+  }
+
+  return true;
+}
+
+bool
+nsXBLBinding::LookupMember(JSContext* aCx, JS::Handle<jsid> aId,
+                           JS::MutableHandle<JS::PropertyDescriptor> aDesc)
+{
+  // We should never enter this function with a pre-filled property descriptor.
+  MOZ_ASSERT(!aDesc.object());
+
+  // Get the string as an nsString before doing anything, so we can make
+  // convenient comparisons during our search.
+  if (!JSID_IS_STRING(aId)) {
+    return true;
+  }
+  nsAutoJSString name;
+  if (!name.init(aCx, JSID_TO_STRING(aId))) {
+    return false;
+  }
+
+  // We have a weak reference to our bound element, so make sure it's alive.
+  if (!mBoundElement || !mBoundElement->GetWrapper()) {
+    return false;
+  }
+
+  // Get the scope of mBoundElement and the associated XBL scope. We should only
+  // be calling into this machinery if we're running in a separate XBL scope.
+  //
+  // Note that we only end up in LookupMember for XrayWrappers from XBL scopes
+  // into content. So for NAC reflectors that live in the XBL scope, we should
+  // never get here. But on the off-chance that someone adds new callsites to
+  // LookupMember, we do a release-mode assertion as belt-and-braces.
+  // We do a release-mode assertion here to be extra safe.
+  //
+  // This code is only called for content XBL, so we don't have to worry about
+  // add-on scopes here.
+  JS::Rooted<JSObject*> boundScope(aCx,
+    js::GetGlobalForObjectCrossCompartment(mBoundElement->GetWrapper()));
+  MOZ_RELEASE_ASSERT(!xpc::IsInAddonScope(boundScope));
+  MOZ_RELEASE_ASSERT(!xpc::IsInContentXBLScope(boundScope));
+  JS::Rooted<JSObject*> xblScope(aCx, xpc::GetXBLScope(aCx, boundScope));
+  NS_ENSURE_TRUE(xblScope, false);
+  MOZ_ASSERT(boundScope != xblScope);
+
+  // Enter the xbl scope and invoke the internal version.
+  {
+    JSAutoCompartment ac(aCx, xblScope);
+    JS::Rooted<jsid> id(aCx, aId);
+    if (!LookupMemberInternal(aCx, name, id, aDesc, xblScope)) {
+      return false;
+    }
+  }
+
+  // Wrap into the caller's scope.
+  return JS_WrapPropertyDescriptor(aCx, aDesc);
+}
+
+bool
+nsXBLBinding::LookupMemberInternal(JSContext* aCx, nsString& aName,
+                                   JS::Handle<jsid> aNameAsId,
+                                   JS::MutableHandle<JS::PropertyDescriptor> aDesc,
+                                   JS::Handle<JSObject*> aXBLScope)
+{
+  // First, see if we have an implementation. If we don't, it means that this
+  // binding doesn't have a class object, and thus doesn't have any members.
+  // Skip it.
+  if (!PrototypeBinding()->HasImplementation()) {
+    if (!mNextBinding) {
+      return true;
+    }
+    return mNextBinding->LookupMemberInternal(aCx, aName, aNameAsId,
+                                              aDesc, aXBLScope);
+  }
+
+  // Find our class object. It's in a protected scope and permanent just in case,
+  // so should be there no matter what.
+  JS::Rooted<JS::Value> classObject(aCx);
+  if (!JS_GetUCProperty(aCx, aXBLScope, PrototypeBinding()->ClassName().get(),
+                        -1, &classObject)) {
+    return false;
+  }
+
+  // The bound element may have been adoped by a document and have a different
+  // wrapper (and different xbl scope) than when the binding was applied, in
+  // this case getting the class object will fail. Behave as if the class
+  // object did not exist.
+  if (classObject.isUndefined()) {
+    return true;
+  }
+
+  MOZ_ASSERT(classObject.isObject());
+
+  // Look for the property on this binding. If it's not there, try the next
+  // binding on the chain.
+  nsXBLProtoImpl* impl = mPrototypeBinding->GetImplementation();
+  JS::Rooted<JSObject*> object(aCx, &classObject.toObject());
+  if (impl && !impl->LookupMember(aCx, aName, aNameAsId, aDesc, object)) {
+    return false;
+  }
+  if (aDesc.object() || !mNextBinding) {
+    return true;
+  }
+
+  return mNextBinding->LookupMemberInternal(aCx, aName, aNameAsId, aDesc,
+                                            aXBLScope);
+}
+
+bool
+nsXBLBinding::HasField(nsString& aName)
+{
+  // See if this binding has such a field.
+  return mPrototypeBinding->FindField(aName) ||
+    (mNextBinding && mNextBinding->HasField(aName));
+}
+
+void
+nsXBLBinding::MarkForDeath()
+{
+  mMarkedForDeath = true;
+  ExecuteDetachedHandler();
+}
+
+bool
+nsXBLBinding::ImplementsInterface(REFNSIID aIID) const
+{
+  return mPrototypeBinding->ImplementsInterface(aIID) ||
+    (mNextBinding && mNextBinding->ImplementsInterface(aIID));
+}
diff --git a/dom/xbl/nsXBLBinding.h b/dom/xbl/nsXBLBinding.h
new file mode 100644
index 0000000000..b977c3e879
--- /dev/null
+++ b/dom/xbl/nsXBLBinding.h
@@ -0,0 +1,187 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLBinding_h_
+#define nsXBLBinding_h_
+
+#include "nsXBLService.h"
+#include "nsCOMPtr.h"
+#include "nsINodeList.h"
+#include "nsIStyleRuleProcessor.h"
+#include "nsClassHashtable.h"
+#include "nsTArray.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupportsImpl.h"
+#include "js/TypeDecls.h"
+
+class nsXBLPrototypeBinding;
+class nsIContent;
+class nsIAtom;
+class nsIDocument;
+
+namespace mozilla {
+namespace dom {
+
+class ShadowRoot;
+class XBLChildrenElement;
+
+} // namespace dom
+} // namespace mozilla
+
+class nsAnonymousContentList;
+
+// *********************************************************************/
+// The XBLBinding class
+
+class nsXBLBinding final
+{
+public:
+  explicit nsXBLBinding(nsXBLPrototypeBinding* aProtoBinding);
+  nsXBLBinding(mozilla::dom::ShadowRoot* aShadowRoot, nsXBLPrototypeBinding* aProtoBinding);
+
+  /**
+   * XBLBindings are refcounted.  They are held onto in 3 ways:
+   * 1. The binding manager's binding table holds onto all bindings that are
+   *    currently attached to a content node.
+   * 2. Bindings hold onto their base binding.  This is important since
+   *    the base binding itself may not be attached to anything.
+   * 3. The binding manager holds an additional reference to bindings
+   *    which are queued to fire their constructors.
+   */
+
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(nsXBLBinding)
+
+  NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(nsXBLBinding)
+
+  nsXBLPrototypeBinding* PrototypeBinding() const { return mPrototypeBinding; }
+  nsIContent* GetAnonymousContent() { return mContent.get(); }
+  nsXBLBinding* GetBindingWithContent();
+
+  nsXBLBinding* GetBaseBinding() const { return mNextBinding; }
+  void SetBaseBinding(nsXBLBinding *aBinding);
+
+  nsIContent* GetBoundElement() { return mBoundElement; }
+  void SetBoundElement(nsIContent *aElement);
+
+  /*
+   * Does a lookup for a method or attribute provided by one of the bindings'
+   * prototype implementation. If found, |desc| will be set up appropriately,
+   * and wrapped into cx->compartment.
+   *
+   * May only be called when XBL code is being run in a separate scope, because
+   * otherwise we don't have untainted data with which to do a proper lookup.
+   */
+  bool LookupMember(JSContext* aCx, JS::Handle<jsid> aId,
+                    JS::MutableHandle<JS::PropertyDescriptor> aDesc);
+
+  /*
+   * Determines whether the binding has a field with the given name.
+   */
+  bool HasField(nsString& aName);
+
+protected:
+
+  ~nsXBLBinding();
+
+  /*
+   * Internal version. Requires that aCx is in appropriate xbl scope.
+   */
+  bool LookupMemberInternal(JSContext* aCx, nsString& aName,
+                            JS::Handle<jsid> aNameAsId,
+                            JS::MutableHandle<JS::PropertyDescriptor> aDesc,
+                            JS::Handle<JSObject*> aXBLScope);
+
+public:
+
+  void MarkForDeath();
+  bool MarkedForDeath() const { return mMarkedForDeath; }
+
+  bool HasStyleSheets() const;
+  bool InheritsStyle() const;
+  bool ImplementsInterface(REFNSIID aIID) const;
+
+  void GenerateAnonymousContent();
+  void InstallAnonymousContent(nsIContent* aAnonParent, nsIContent* aElement,
+                               bool aNativeAnon);
+  static void UninstallAnonymousContent(nsIDocument* aDocument,
+                                        nsIContent* aAnonParent);
+  void InstallEventHandlers();
+  nsresult InstallImplementation();
+
+  void ExecuteAttachedHandler();
+  void ExecuteDetachedHandler();
+  void UnhookEventHandlers();
+
+  nsIAtom* GetBaseTag(int32_t* aNameSpaceID);
+  nsXBLBinding* RootBinding();
+
+  // Resolve all the fields for this binding and all ancestor bindings on the
+  // object |obj|.  False return means a JS exception was set.
+  bool ResolveAllFields(JSContext *cx, JS::Handle<JSObject*> obj) const;
+
+  void AttributeChanged(nsIAtom* aAttribute, int32_t aNameSpaceID,
+                        bool aRemoveFlag, bool aNotify);
+
+  void ChangeDocument(nsIDocument* aOldDocument, nsIDocument* aNewDocument);
+
+  void WalkRules(nsIStyleRuleProcessor::EnumFunc aFunc, void* aData);
+
+  static nsresult DoInitJSClass(JSContext *cx, JS::Handle<JSObject*> obj,
+                                const nsAFlatString& aClassName,
+                                nsXBLPrototypeBinding* aProtoBinding,
+                                JS::MutableHandle<JSObject*> aClassObject,
+                                bool* aNew);
+
+  bool AllowScripts();
+
+  mozilla::dom::XBLChildrenElement* FindInsertionPointFor(nsIContent* aChild);
+
+  bool HasFilteredInsertionPoints()
+  {
+    return !mInsertionPoints.IsEmpty();
+  }
+
+  mozilla::dom::XBLChildrenElement* GetDefaultInsertionPoint()
+  {
+    return mDefaultInsertionPoint;
+  }
+
+  // Removes all inserted node from <xbl:children> insertion points under us.
+  void ClearInsertionPoints();
+
+  // Returns a live node list that iterates over the anonymous nodes generated
+  // by this binding.
+  nsAnonymousContentList* GetAnonymousNodeList();
+
+ nsIURI* GetSourceDocURI();
+
+// MEMBER VARIABLES
+protected:
+
+  bool mMarkedForDeath;
+  bool mUsingContentXBLScope;
+  bool mIsShadowRootBinding;
+
+  nsXBLPrototypeBinding* mPrototypeBinding; // Weak, but we're holding a ref to the docinfo
+  nsCOMPtr<nsIContent> mContent; // Strong. Our anonymous content stays around with us.
+  RefPtr<nsXBLBinding> mNextBinding; // Strong. The derived binding owns the base class bindings.
+
+  nsIContent* mBoundElement; // [WEAK] We have a reference, but we don't own it.
+
+  // The <xbl:children> elements that we found in our <xbl:content> when we
+  // processed this binding. The default insertion point has no includes
+  // attribute and all other insertion points must have at least one includes
+  // attribute. These points must be up-to-date with respect to their parent's
+  // children, even if their parent has another binding attached to it,
+  // preventing us from rendering their contents directly.
+  RefPtr<mozilla::dom::XBLChildrenElement> mDefaultInsertionPoint;
+  nsTArray<RefPtr<mozilla::dom::XBLChildrenElement> > mInsertionPoints;
+  RefPtr<nsAnonymousContentList> mAnonymousContentList;
+
+  mozilla::dom::XBLChildrenElement* FindInsertionPointForInternal(nsIContent* aChild);
+};
+
+#endif // nsXBLBinding_h_
diff --git a/dom/xbl/nsXBLContentSink.cpp b/dom/xbl/nsXBLContentSink.cpp
new file mode 100644
index 0000000000..4d5c9fb74f
--- /dev/null
+++ b/dom/xbl/nsXBLContentSink.cpp
@@ -0,0 +1,937 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsXBLContentSink.h"
+#include "nsIDocument.h"
+#include "nsBindingManager.h"
+#include "nsIDOMNode.h"
+#include "nsGkAtoms.h"
+#include "nsNameSpaceManager.h"
+#include "nsIURI.h"
+#include "nsTextFragment.h"
+#ifdef MOZ_XUL
+#include "nsXULElement.h"
+#endif
+#include "nsXBLProtoImplProperty.h"
+#include "nsXBLProtoImplMethod.h"
+#include "nsXBLProtoImplField.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsContentUtils.h"
+#include "nsIConsoleService.h"
+#include "nsIScriptError.h"
+#include "nsNodeInfoManager.h"
+#include "nsIPrincipal.h"
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsresult
+NS_NewXBLContentSink(nsIXMLContentSink** aResult,
+                     nsIDocument* aDoc,
+                     nsIURI* aURI,
+                     nsISupports* aContainer)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  RefPtr<nsXBLContentSink> it = new nsXBLContentSink();
+  nsresult rv = it->Init(aDoc, aURI, aContainer);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  it.forget(aResult);
+  return NS_OK;
+}
+
+nsXBLContentSink::nsXBLContentSink()
+  : mState(eXBL_InDocument),
+    mSecondaryState(eXBL_None),
+    mDocInfo(nullptr),
+    mIsChromeOrResource(false),
+    mFoundFirstBinding(false),
+    mBinding(nullptr),
+    mHandler(nullptr),
+    mImplementation(nullptr),
+    mImplMember(nullptr),
+    mImplField(nullptr),
+    mProperty(nullptr),
+    mMethod(nullptr),
+    mField(nullptr)
+{
+  mPrettyPrintXML = false;
+}
+
+nsXBLContentSink::~nsXBLContentSink()
+{
+}
+
+nsresult
+nsXBLContentSink::Init(nsIDocument* aDoc,
+                       nsIURI* aURI,
+                       nsISupports* aContainer)
+{
+  nsresult rv;
+  rv = nsXMLContentSink::Init(aDoc, aURI, aContainer, nullptr);
+  return rv;
+}
+
+void
+nsXBLContentSink::MaybeStartLayout(bool aIgnorePendingSheets)
+{
+  return;
+}
+
+nsresult
+nsXBLContentSink::FlushText(bool aReleaseTextNode)
+{
+  if (mTextLength != 0) {
+    const nsASingleFragmentString& text = Substring(mText, mText+mTextLength);
+    if (mState == eXBL_InHandlers) {
+      NS_ASSERTION(mBinding, "Must have binding here");
+      // Get the text and add it to the event handler.
+      if (mSecondaryState == eXBL_InHandler)
+        mHandler->AppendHandlerText(text);
+      mTextLength = 0;
+      return NS_OK;
+    }
+    else if (mState == eXBL_InImplementation) {
+      NS_ASSERTION(mBinding, "Must have binding here");
+      if (mSecondaryState == eXBL_InConstructor ||
+          mSecondaryState == eXBL_InDestructor) {
+        // Construct a method for the constructor/destructor.
+        nsXBLProtoImplMethod* method;
+        if (mSecondaryState == eXBL_InConstructor)
+          method = mBinding->GetConstructor();
+        else
+          method = mBinding->GetDestructor();
+
+        // Get the text and add it to the constructor/destructor.
+        method->AppendBodyText(text);
+      }
+      else if (mSecondaryState == eXBL_InGetter ||
+               mSecondaryState == eXBL_InSetter) {
+        // Get the text and add it to the getter/setter
+        if (mSecondaryState == eXBL_InGetter)
+          mProperty->AppendGetterText(text);
+        else
+          mProperty->AppendSetterText(text);
+      }
+      else if (mSecondaryState == eXBL_InBody) {
+        // Get the text and add it to the method
+        if (mMethod)
+          mMethod->AppendBodyText(text);
+      }
+      else if (mSecondaryState == eXBL_InField) {
+        // Get the text and add it to the method
+        if (mField)
+          mField->AppendFieldText(text);
+      }
+      mTextLength = 0;
+      return NS_OK;
+    }
+
+    nsIContent* content = GetCurrentContent();
+    if (content &&
+        (content->NodeInfo()->NamespaceEquals(kNameSpaceID_XBL) ||
+         (content->IsXULElement() &&
+          !content->IsAnyOfXULElements(nsGkAtoms::label,
+                                       nsGkAtoms::description)))) {
+
+      bool isWS = true;
+      if (mTextLength > 0) {
+        const char16_t* cp = mText;
+        const char16_t* end = mText + mTextLength;
+        while (cp < end) {
+          char16_t ch = *cp++;
+          if (!dom::IsSpaceCharacter(ch)) {
+            isWS = false;
+            break;
+          }
+        }
+      }
+
+      if (isWS && mTextLength > 0) {
+        mTextLength = 0;
+        // Make sure to drop the textnode, if any
+        return nsXMLContentSink::FlushText(aReleaseTextNode);
+      }
+    }
+  }
+
+  return nsXMLContentSink::FlushText(aReleaseTextNode);
+}
+
+NS_IMETHODIMP
+nsXBLContentSink::ReportError(const char16_t* aErrorText, 
+                              const char16_t* aSourceText,
+                              nsIScriptError *aError,
+                              bool *_retval)
+{
+  NS_PRECONDITION(aError && aSourceText && aErrorText, "Check arguments!!!");
+
+  // XXX FIXME This function overrides and calls on
+  // nsXMLContentSink::ReportError, and probably should die.  See bug 347826.
+
+  // XXX We should make sure the binding has no effect, but that it also
+  // gets destroyed properly without leaking.  Perhaps we should even
+  // ensure that the content that was bound is displayed with no
+  // binding.
+
+#ifdef DEBUG
+  // Report the error to stderr.
+  fprintf(stderr,
+          "\n%s\n%s\n\n",
+          NS_LossyConvertUTF16toASCII(aErrorText).get(),
+          NS_LossyConvertUTF16toASCII(aSourceText).get());
+#endif
+
+  // Most of what this does won't be too useful, but whatever...
+  // nsXMLContentSink::ReportError will handle the console logging.
+  return nsXMLContentSink::ReportError(aErrorText, 
+                                       aSourceText, 
+                                       aError,
+                                       _retval);
+}
+
+nsresult
+nsXBLContentSink::ReportUnexpectedElement(nsIAtom* aElementName,
+                                          uint32_t aLineNumber)
+{
+  // XXX we should really somehow stop the parse and drop the binding
+  // instead of just letting the XML sink build the content model like
+  // we do...
+  mState = eXBL_Error;
+  nsAutoString elementName;
+  aElementName->ToString(elementName);
+
+  const char16_t* params[] = { elementName.get() };
+
+  return nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                         NS_LITERAL_CSTRING("XBL Content Sink"),
+                                         mDocument,
+                                         nsContentUtils::eXBL_PROPERTIES,
+                                         "UnexpectedElement",
+                                         params, ArrayLength(params),
+                                         nullptr,
+                                         EmptyString() /* source line */,
+                                         aLineNumber);
+}
+
+void
+nsXBLContentSink::AddMember(nsXBLProtoImplMember* aMember)
+{
+  // Add this member to our chain.
+  if (mImplMember)
+    mImplMember->SetNext(aMember); // Already have a chain. Just append to the end.
+  else
+    mImplementation->SetMemberList(aMember); // We're the first member in the chain.
+
+  mImplMember = aMember; // Adjust our pointer to point to the new last member in the chain.
+}
+
+void
+nsXBLContentSink::AddField(nsXBLProtoImplField* aField)
+{
+  // Add this field to our chain.
+  if (mImplField)
+    mImplField->SetNext(aField); // Already have a chain. Just append to the end.
+  else
+    mImplementation->SetFieldList(aField); // We're the first member in the chain.
+
+  mImplField = aField; // Adjust our pointer to point to the new last field in the chain.
+}
+
+NS_IMETHODIMP 
+nsXBLContentSink::HandleStartElement(const char16_t *aName, 
+                                     const char16_t **aAtts, 
+                                     uint32_t aAttsCount, 
+                                     uint32_t aLineNumber)
+{
+  nsresult rv = nsXMLContentSink::HandleStartElement(aName, aAtts, aAttsCount,
+                                                     aLineNumber);
+  if (NS_FAILED(rv))
+    return rv;
+
+  if (mState == eXBL_InBinding && !mBinding) {
+    rv = ConstructBinding(aLineNumber);
+    if (NS_FAILED(rv))
+      return rv;
+    
+    // mBinding may still be null, if the binding had no id.  If so,
+    // we'll deal with that later in the sink.
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP 
+nsXBLContentSink::HandleEndElement(const char16_t *aName)
+{
+  FlushText();
+
+  if (mState != eXBL_InDocument) {
+    int32_t nameSpaceID;
+    nsCOMPtr<nsIAtom> prefix, localName;
+    nsContentUtils::SplitExpatName(aName, getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    if (nameSpaceID == kNameSpaceID_XBL) {
+      if (mState == eXBL_Error) {
+        // Check whether we've opened this tag before; we may not have if
+        // it was a real XBL tag before the error occurred.
+        if (!GetCurrentContent()->NodeInfo()->Equals(localName,
+                                                     nameSpaceID)) {
+          // OK, this tag was never opened as far as the XML sink is
+          // concerned.  Just drop the HandleEndElement
+          return NS_OK;
+        }
+      }
+      else if (mState == eXBL_InHandlers) {
+        if (localName == nsGkAtoms::handlers) {
+          mState = eXBL_InBinding;
+          mHandler = nullptr;
+        }
+        else if (localName == nsGkAtoms::handler)
+          mSecondaryState = eXBL_None;
+        return NS_OK;
+      }
+      else if (mState == eXBL_InResources) {
+        if (localName == nsGkAtoms::resources)
+          mState = eXBL_InBinding;
+        return NS_OK;
+      }
+      else if (mState == eXBL_InImplementation) {
+        if (localName == nsGkAtoms::implementation)
+          mState = eXBL_InBinding;
+        else if (localName == nsGkAtoms::property) {
+          mSecondaryState = eXBL_None;
+          mProperty = nullptr;
+        }
+        else if (localName == nsGkAtoms::method) {
+          mSecondaryState = eXBL_None;
+          mMethod = nullptr;
+        }
+        else if (localName == nsGkAtoms::field) {
+          mSecondaryState = eXBL_None;
+          mField = nullptr;
+        }
+        else if (localName == nsGkAtoms::constructor ||
+                 localName == nsGkAtoms::destructor)
+          mSecondaryState = eXBL_None;
+        else if (localName == nsGkAtoms::getter ||
+                 localName == nsGkAtoms::setter)
+          mSecondaryState = eXBL_InProperty;
+        else if (localName == nsGkAtoms::parameter ||
+                 localName == nsGkAtoms::body)
+          mSecondaryState = eXBL_InMethod;
+        return NS_OK;
+      }
+      else if (mState == eXBL_InBindings &&
+               localName == nsGkAtoms::bindings) {
+        mState = eXBL_InDocument;
+      }
+      
+      nsresult rv = nsXMLContentSink::HandleEndElement(aName);
+      if (NS_FAILED(rv))
+        return rv;
+
+      if (mState == eXBL_InBinding && localName == nsGkAtoms::binding) {
+        mState = eXBL_InBindings;
+        if (mBinding) {  // See comment in HandleStartElement()
+          mBinding->Initialize();
+          mBinding = nullptr; // Clear our current binding ref.
+        }
+      }
+
+      return NS_OK;
+    }
+  }
+
+  return nsXMLContentSink::HandleEndElement(aName);
+}
+
+NS_IMETHODIMP 
+nsXBLContentSink::HandleCDataSection(const char16_t *aData, 
+                                     uint32_t aLength)
+{
+  if (mState == eXBL_InHandlers || mState == eXBL_InImplementation)
+    return AddText(aData, aLength);
+  return nsXMLContentSink::HandleCDataSection(aData, aLength);
+}
+
+#define ENSURE_XBL_STATE(_cond)                                                       \
+  PR_BEGIN_MACRO                                                                      \
+    if (!(_cond)) { ReportUnexpectedElement(aTagName, aLineNumber); return true; } \
+  PR_END_MACRO
+
+bool 
+nsXBLContentSink::OnOpenContainer(const char16_t **aAtts, 
+                                  uint32_t aAttsCount, 
+                                  int32_t aNameSpaceID, 
+                                  nsIAtom* aTagName,
+                                  uint32_t aLineNumber)
+{
+  if (mState == eXBL_Error) {
+    return true;
+  }
+  
+  if (aNameSpaceID != kNameSpaceID_XBL) {
+    // Construct non-XBL nodes
+    return true;
+  }
+
+  bool ret = true;
+  if (aTagName == nsGkAtoms::bindings) {
+    ENSURE_XBL_STATE(mState == eXBL_InDocument);
+
+    NS_ASSERTION(mDocument, "Must have a document!");
+    RefPtr<nsXBLDocumentInfo> info = new nsXBLDocumentInfo(mDocument);
+
+    // We keep a weak ref. We're creating a cycle between doc/binding manager/doc info.
+    mDocInfo = info;
+
+    if (!mDocInfo) {
+      mState = eXBL_Error;
+      return true;
+    }
+
+    mDocument->BindingManager()->PutXBLDocumentInfo(mDocInfo);
+
+    nsIURI *uri = mDocument->GetDocumentURI();
+
+    bool isChrome = false;
+    bool isRes = false;
+
+    uri->SchemeIs("chrome", &isChrome);
+    uri->SchemeIs("resource", &isRes);
+    mIsChromeOrResource = isChrome || isRes;
+
+    mState = eXBL_InBindings;
+  }
+  else if (aTagName == nsGkAtoms::binding) {
+    ENSURE_XBL_STATE(mState == eXBL_InBindings);
+    mState = eXBL_InBinding;
+  }
+  else if (aTagName == nsGkAtoms::handlers) {
+    ENSURE_XBL_STATE(mState == eXBL_InBinding && mBinding);
+    mState = eXBL_InHandlers;
+    ret = false;
+  }
+  else if (aTagName == nsGkAtoms::handler) {
+    ENSURE_XBL_STATE(mState == eXBL_InHandlers);
+    mSecondaryState = eXBL_InHandler;
+    ConstructHandler(aAtts, aLineNumber);
+    ret = false;
+  }
+  else if (aTagName == nsGkAtoms::resources) {
+    ENSURE_XBL_STATE(mState == eXBL_InBinding && mBinding);
+    mState = eXBL_InResources;
+    // Note that this mState will cause us to return false, so no need
+    // to set ret to false.
+  }
+  else if (aTagName == nsGkAtoms::stylesheet || aTagName == nsGkAtoms::image) {
+    ENSURE_XBL_STATE(mState == eXBL_InResources);
+    NS_ASSERTION(mBinding, "Must have binding here");
+    ConstructResource(aAtts, aTagName);
+  }
+  else if (aTagName == nsGkAtoms::implementation) {
+    ENSURE_XBL_STATE(mState == eXBL_InBinding && mBinding);
+    mState = eXBL_InImplementation;
+    ConstructImplementation(aAtts);
+    // Note that this mState will cause us to return false, so no need
+    // to set ret to false.
+  }
+  else if (aTagName == nsGkAtoms::constructor) {
+    ENSURE_XBL_STATE(mState == eXBL_InImplementation &&
+                     mSecondaryState == eXBL_None);
+    NS_ASSERTION(mBinding, "Must have binding here");
+      
+    mSecondaryState = eXBL_InConstructor;
+    nsAutoString name;
+    if (!mCurrentBindingID.IsEmpty()) {
+      name.Assign(mCurrentBindingID);
+      name.AppendLiteral("_XBL_Constructor");
+    } else {
+      name.AppendLiteral("XBL_Constructor");
+    }
+    nsXBLProtoImplAnonymousMethod* newMethod =
+      new nsXBLProtoImplAnonymousMethod(name.get());
+    newMethod->SetLineNumber(aLineNumber);
+    mBinding->SetConstructor(newMethod);
+    AddMember(newMethod);
+  }
+  else if (aTagName == nsGkAtoms::destructor) {
+    ENSURE_XBL_STATE(mState == eXBL_InImplementation &&
+                     mSecondaryState == eXBL_None);
+    NS_ASSERTION(mBinding, "Must have binding here");
+    mSecondaryState = eXBL_InDestructor;
+    nsAutoString name;
+    if (!mCurrentBindingID.IsEmpty()) {
+      name.Assign(mCurrentBindingID);
+      name.AppendLiteral("_XBL_Destructor");
+    } else {
+      name.AppendLiteral("XBL_Destructor");
+    }
+    nsXBLProtoImplAnonymousMethod* newMethod =
+      new nsXBLProtoImplAnonymousMethod(name.get());
+    newMethod->SetLineNumber(aLineNumber);
+    mBinding->SetDestructor(newMethod);
+    AddMember(newMethod);
+  }
+  else if (aTagName == nsGkAtoms::field) {
+    ENSURE_XBL_STATE(mState == eXBL_InImplementation &&
+                     mSecondaryState == eXBL_None);
+    NS_ASSERTION(mBinding, "Must have binding here");
+    mSecondaryState = eXBL_InField;
+    ConstructField(aAtts, aLineNumber);
+  }
+  else if (aTagName == nsGkAtoms::property) {
+    ENSURE_XBL_STATE(mState == eXBL_InImplementation &&
+                     mSecondaryState == eXBL_None);
+    NS_ASSERTION(mBinding, "Must have binding here");
+    mSecondaryState = eXBL_InProperty;
+    ConstructProperty(aAtts, aLineNumber);
+  }
+  else if (aTagName == nsGkAtoms::getter) {
+    ENSURE_XBL_STATE(mSecondaryState == eXBL_InProperty && mProperty);
+    NS_ASSERTION(mState == eXBL_InImplementation, "Unexpected state");
+    mProperty->SetGetterLineNumber(aLineNumber);
+    mSecondaryState = eXBL_InGetter;
+  }
+  else if (aTagName == nsGkAtoms::setter) {
+    ENSURE_XBL_STATE(mSecondaryState == eXBL_InProperty && mProperty);
+    NS_ASSERTION(mState == eXBL_InImplementation, "Unexpected state");
+    mProperty->SetSetterLineNumber(aLineNumber);
+    mSecondaryState = eXBL_InSetter;
+  }
+  else if (aTagName == nsGkAtoms::method) {
+    ENSURE_XBL_STATE(mState == eXBL_InImplementation &&
+                     mSecondaryState == eXBL_None);
+    NS_ASSERTION(mBinding, "Must have binding here");
+    mSecondaryState = eXBL_InMethod;
+    ConstructMethod(aAtts);
+  }
+  else if (aTagName == nsGkAtoms::parameter) {
+    ENSURE_XBL_STATE(mSecondaryState == eXBL_InMethod && mMethod);
+    NS_ASSERTION(mState == eXBL_InImplementation, "Unexpected state");
+    ConstructParameter(aAtts);
+  }
+  else if (aTagName == nsGkAtoms::body) {
+    ENSURE_XBL_STATE(mSecondaryState == eXBL_InMethod && mMethod);
+    NS_ASSERTION(mState == eXBL_InImplementation, "Unexpected state");
+    // stash away the line number
+    mMethod->SetLineNumber(aLineNumber);
+    mSecondaryState = eXBL_InBody;
+  }
+
+  return ret && mState != eXBL_InResources && mState != eXBL_InImplementation;
+}
+
+#undef ENSURE_XBL_STATE
+
+nsresult
+nsXBLContentSink::ConstructBinding(uint32_t aLineNumber)
+{
+  nsCOMPtr<nsIContent> binding = GetCurrentContent();
+  binding->GetAttr(kNameSpaceID_None, nsGkAtoms::id, mCurrentBindingID);
+  NS_ConvertUTF16toUTF8 cid(mCurrentBindingID);
+
+  nsresult rv = NS_OK;
+
+  // Don't create a binding with no id. nsXBLPrototypeBinding::Read also
+  // performs this check.
+  if (!cid.IsEmpty()) {
+    mBinding = new nsXBLPrototypeBinding();
+
+    rv = mBinding->Init(cid, mDocInfo, binding, !mFoundFirstBinding);
+    if (NS_SUCCEEDED(rv) &&
+        NS_SUCCEEDED(mDocInfo->SetPrototypeBinding(cid, mBinding))) {
+      if (!mFoundFirstBinding) {
+        mFoundFirstBinding = true;
+        mDocInfo->SetFirstPrototypeBinding(mBinding);
+      }
+      binding->UnsetAttr(kNameSpaceID_None, nsGkAtoms::id, false);
+    } else {
+      delete mBinding;
+      mBinding = nullptr;
+    }
+  } else {
+    nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                    NS_LITERAL_CSTRING("XBL Content Sink"), nullptr,
+                                    nsContentUtils::eXBL_PROPERTIES,
+                                    "MissingIdAttr", nullptr, 0,
+                                    mDocumentURI,
+                                    EmptyString(),
+                                    aLineNumber);
+  }
+
+  return rv;
+}
+
+static bool
+FindValue(const char16_t **aAtts, nsIAtom *aAtom, const char16_t **aResult)
+{
+  nsCOMPtr<nsIAtom> prefix, localName;
+  for (; *aAtts; aAtts += 2) {
+    int32_t nameSpaceID;
+    nsContentUtils::SplitExpatName(aAtts[0], getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    // Is this attribute one of the ones we care about?
+    if (nameSpaceID == kNameSpaceID_None && localName == aAtom) {
+      *aResult = aAtts[1];
+
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void
+nsXBLContentSink::ConstructHandler(const char16_t **aAtts, uint32_t aLineNumber)
+{
+  const char16_t* event          = nullptr;
+  const char16_t* modifiers      = nullptr;
+  const char16_t* button         = nullptr;
+  const char16_t* clickcount     = nullptr;
+  const char16_t* keycode        = nullptr;
+  const char16_t* charcode       = nullptr;
+  const char16_t* phase          = nullptr;
+  const char16_t* command        = nullptr;
+  const char16_t* action         = nullptr;
+  const char16_t* group          = nullptr;
+  const char16_t* preventdefault = nullptr;
+  const char16_t* allowuntrusted = nullptr;
+
+  nsCOMPtr<nsIAtom> prefix, localName;
+  for (; *aAtts; aAtts += 2) {
+    int32_t nameSpaceID;
+    nsContentUtils::SplitExpatName(aAtts[0], getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    if (nameSpaceID != kNameSpaceID_None) {
+      continue;
+    }
+
+    // Is this attribute one of the ones we care about?
+    if (localName == nsGkAtoms::event)
+      event = aAtts[1];
+    else if (localName == nsGkAtoms::modifiers)
+      modifiers = aAtts[1];
+    else if (localName == nsGkAtoms::button)
+      button = aAtts[1];
+    else if (localName == nsGkAtoms::clickcount)
+      clickcount = aAtts[1];
+    else if (localName == nsGkAtoms::keycode)
+      keycode = aAtts[1];
+    else if (localName == nsGkAtoms::key || localName == nsGkAtoms::charcode)
+      charcode = aAtts[1];
+    else if (localName == nsGkAtoms::phase)
+      phase = aAtts[1];
+    else if (localName == nsGkAtoms::command)
+      command = aAtts[1];
+    else if (localName == nsGkAtoms::action)
+      action = aAtts[1];
+    else if (localName == nsGkAtoms::group)
+      group = aAtts[1];
+    else if (localName == nsGkAtoms::preventdefault)
+      preventdefault = aAtts[1];
+    else if (localName == nsGkAtoms::allowuntrusted)
+      allowuntrusted = aAtts[1];
+  }
+
+  if (command && !mIsChromeOrResource) {
+    // Make sure the XBL doc is chrome or resource if we have a command
+    // shorthand syntax.
+    mState = eXBL_Error;
+    nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                    NS_LITERAL_CSTRING("XBL Content Sink"),
+                                    mDocument,
+                                    nsContentUtils::eXBL_PROPERTIES,
+                                    "CommandNotInChrome", nullptr, 0,
+                                    nullptr,
+                                    EmptyString() /* source line */,
+                                    aLineNumber);
+    return; // Don't even make this handler.
+  }
+
+  // All of our pointers are now filled in. Construct our handler with all of
+  // these parameters.
+  nsXBLPrototypeHandler* newHandler;
+  newHandler = new nsXBLPrototypeHandler(event, phase, action, command,
+                                         keycode, charcode, modifiers, button,
+                                         clickcount, group, preventdefault,
+                                         allowuntrusted, mBinding, aLineNumber);
+
+  // Add this handler to our chain of handlers.
+  if (mHandler) {
+    // Already have a chain. Just append to the end.
+    mHandler->SetNextHandler(newHandler);
+  } else {
+    // We're the first handler in the chain.
+    mBinding->SetPrototypeHandlers(newHandler);
+  }
+  // Adjust our mHandler pointer to point to the new last handler in the
+  // chain.
+  mHandler = newHandler;
+}
+
+void
+nsXBLContentSink::ConstructResource(const char16_t **aAtts,
+                                    nsIAtom* aResourceType)
+{
+  if (!mBinding)
+    return;
+
+  const char16_t* src = nullptr;
+  if (FindValue(aAtts, nsGkAtoms::src, &src)) {
+    mBinding->AddResource(aResourceType, nsDependentString(src));
+  }
+}
+
+void
+nsXBLContentSink::ConstructImplementation(const char16_t **aAtts)
+{
+  mImplementation = nullptr;
+  mImplMember = nullptr;
+  mImplField = nullptr;
+  
+  if (!mBinding)
+    return;
+
+  const char16_t* name = nullptr;
+
+  nsCOMPtr<nsIAtom> prefix, localName;
+  for (; *aAtts; aAtts += 2) {
+    int32_t nameSpaceID;
+    nsContentUtils::SplitExpatName(aAtts[0], getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    if (nameSpaceID != kNameSpaceID_None) {
+      continue;
+    }
+
+    // Is this attribute one of the ones we care about?
+    if (localName == nsGkAtoms::name) {
+      name = aAtts[1];
+    }
+    else if (localName == nsGkAtoms::implements) {
+      // Only allow implementation of interfaces via XBL if the principal of
+      // our XBL document is the system principal.
+      if (nsContentUtils::IsSystemPrincipal(mDocument->NodePrincipal())) {
+        mBinding->ConstructInterfaceTable(nsDependentString(aAtts[1]));
+      }
+    }
+  }
+
+  NS_NewXBLProtoImpl(mBinding, name, &mImplementation);
+}
+
+void
+nsXBLContentSink::ConstructField(const char16_t **aAtts, uint32_t aLineNumber)
+{
+  const char16_t* name     = nullptr;
+  const char16_t* readonly = nullptr;
+
+  nsCOMPtr<nsIAtom> prefix, localName;
+  for (; *aAtts; aAtts += 2) {
+    int32_t nameSpaceID;
+    nsContentUtils::SplitExpatName(aAtts[0], getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    if (nameSpaceID != kNameSpaceID_None) {
+      continue;
+    }
+
+    // Is this attribute one of the ones we care about?
+    if (localName == nsGkAtoms::name) {
+      name = aAtts[1];
+    }
+    else if (localName == nsGkAtoms::readonly) {
+      readonly = aAtts[1];
+    }
+  }
+
+  if (name) {
+    // All of our pointers are now filled in. Construct our field with all of
+    // these parameters.
+    mField = new nsXBLProtoImplField(name, readonly);
+    mField->SetLineNumber(aLineNumber);
+    AddField(mField);
+  }
+}
+
+void
+nsXBLContentSink::ConstructProperty(const char16_t **aAtts, uint32_t aLineNumber)
+{
+  const char16_t* name     = nullptr;
+  const char16_t* readonly = nullptr;
+  const char16_t* onget    = nullptr;
+  const char16_t* onset    = nullptr;
+  bool exposeToUntrustedContent = false;
+
+  nsCOMPtr<nsIAtom> prefix, localName;
+  for (; *aAtts; aAtts += 2) {
+    int32_t nameSpaceID;
+    nsContentUtils::SplitExpatName(aAtts[0], getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    if (nameSpaceID != kNameSpaceID_None) {
+      continue;
+    }
+
+    // Is this attribute one of the ones we care about?
+    if (localName == nsGkAtoms::name) {
+      name = aAtts[1];
+    }
+    else if (localName == nsGkAtoms::readonly) {
+      readonly = aAtts[1];
+    }
+    else if (localName == nsGkAtoms::onget) {
+      onget = aAtts[1];
+    }
+    else if (localName == nsGkAtoms::onset) {
+      onset = aAtts[1];
+    }
+    else if (localName == nsGkAtoms::exposeToUntrustedContent &&
+             nsDependentString(aAtts[1]).EqualsLiteral("true"))
+    {
+      exposeToUntrustedContent = true;
+    }
+  }
+
+  if (name) {
+    // All of our pointers are now filled in. Construct our property with all of
+    // these parameters.
+    mProperty = new nsXBLProtoImplProperty(name, onget, onset, readonly, aLineNumber);
+    if (exposeToUntrustedContent) {
+      mProperty->SetExposeToUntrustedContent(true);
+    }
+    AddMember(mProperty);
+  }
+}
+
+void
+nsXBLContentSink::ConstructMethod(const char16_t **aAtts)
+{
+  mMethod = nullptr;
+
+  const char16_t* name = nullptr;
+  const char16_t* expose = nullptr;
+  if (FindValue(aAtts, nsGkAtoms::name, &name)) {
+    mMethod = new nsXBLProtoImplMethod(name);
+    if (FindValue(aAtts, nsGkAtoms::exposeToUntrustedContent, &expose) &&
+        nsDependentString(expose).EqualsLiteral("true"))
+    {
+      mMethod->SetExposeToUntrustedContent(true);
+    }
+  }
+
+  if (mMethod) {
+    AddMember(mMethod);
+  }
+}
+
+void
+nsXBLContentSink::ConstructParameter(const char16_t **aAtts)
+{
+  if (!mMethod)
+    return;
+
+  const char16_t* name = nullptr;
+  if (FindValue(aAtts, nsGkAtoms::name, &name)) {
+    mMethod->AddParameter(nsDependentString(name));
+  }
+}
+
+nsresult
+nsXBLContentSink::CreateElement(const char16_t** aAtts, uint32_t aAttsCount,
+                                mozilla::dom::NodeInfo* aNodeInfo, uint32_t aLineNumber,
+                                nsIContent** aResult, bool* aAppendContent,
+                                FromParser aFromParser)
+{
+#ifdef MOZ_XUL
+  if (!aNodeInfo->NamespaceEquals(kNameSpaceID_XUL)) {
+#endif
+    return nsXMLContentSink::CreateElement(aAtts, aAttsCount, aNodeInfo,
+                                           aLineNumber, aResult,
+                                           aAppendContent, aFromParser);
+#ifdef MOZ_XUL
+  }
+
+  // Note that this needs to match the code in nsXBLPrototypeBinding::ReadContentNode.
+
+  *aAppendContent = true;
+  RefPtr<nsXULPrototypeElement> prototype = new nsXULPrototypeElement();
+
+  prototype->mNodeInfo = aNodeInfo;
+
+  AddAttributesToXULPrototype(aAtts, aAttsCount, prototype);
+
+  Element* result;
+  nsresult rv = nsXULElement::Create(prototype, mDocument, false, false, &result);
+  *aResult = result;
+  return rv;
+#endif
+}
+
+nsresult 
+nsXBLContentSink::AddAttributes(const char16_t** aAtts,
+                                nsIContent* aContent)
+{
+  if (aContent->IsXULElement())
+    return NS_OK; // Nothing to do, since the proto already has the attrs.
+
+  return nsXMLContentSink::AddAttributes(aAtts, aContent);
+}
+
+#ifdef MOZ_XUL
+nsresult
+nsXBLContentSink::AddAttributesToXULPrototype(const char16_t **aAtts, 
+                                              uint32_t aAttsCount, 
+                                              nsXULPrototypeElement* aElement)
+{
+  // Add tag attributes to the element
+  nsresult rv;
+
+  // Create storage for the attributes
+  nsXULPrototypeAttribute* attrs = nullptr;
+  if (aAttsCount > 0) {
+    attrs = new nsXULPrototypeAttribute[aAttsCount];
+  }
+
+  aElement->mAttributes    = attrs;
+  aElement->mNumAttributes = aAttsCount;
+
+  // Copy the attributes into the prototype
+  nsCOMPtr<nsIAtom> prefix, localName;
+
+  uint32_t i;  
+  for (i = 0; i < aAttsCount; ++i) {
+    int32_t nameSpaceID;
+    nsContentUtils::SplitExpatName(aAtts[i * 2], getter_AddRefs(prefix),
+                                   getter_AddRefs(localName), &nameSpaceID);
+
+    if (nameSpaceID == kNameSpaceID_None) {
+      attrs[i].mName.SetTo(localName);
+    }
+    else {
+      RefPtr<NodeInfo> ni;
+      ni = mNodeInfoManager->GetNodeInfo(localName, prefix, nameSpaceID,
+                                         nsIDOMNode::ATTRIBUTE_NODE);
+      attrs[i].mName.SetTo(ni);
+    }
+    
+    rv = aElement->SetAttrAt(i, nsDependentString(aAtts[i * 2 + 1]),
+                             mDocumentURI); 
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
+#endif
diff --git a/dom/xbl/nsXBLContentSink.h b/dom/xbl/nsXBLContentSink.h
new file mode 100644
index 0000000000..3c220c0f3a
--- /dev/null
+++ b/dom/xbl/nsXBLContentSink.h
@@ -0,0 +1,155 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLContentSink_h__
+#define nsXBLContentSink_h__
+
+#include "mozilla/Attributes.h"
+#include "nsXMLContentSink.h"
+#include "nsXBLDocumentInfo.h"
+#include "nsXBLPrototypeHandler.h"
+#include "nsXBLProtoImpl.h"
+#include "nsLayoutCID.h"
+
+/*
+ * Enum that describes the primary state of the parsing process
+ */
+typedef enum {
+  eXBL_InDocument,       /* outside any bindings */
+  eXBL_InBindings,       /* Inside a <bindings> element */
+  eXBL_InBinding,        /* Inside a <binding> */
+  eXBL_InResources,      /* Inside a <resources> */
+  eXBL_InImplementation, /* Inside a <implementation> */
+  eXBL_InHandlers,       /* Inside a <handlers> */
+  eXBL_Error             /* An error has occurred.  Suspend binding construction */
+} XBLPrimaryState;
+
+/*
+ * Enum that describes our substate (typically when parsing something
+ * like <handlers> or <implementation>).
+ */
+typedef enum {
+  eXBL_None,
+  eXBL_InHandler,
+  eXBL_InMethod,
+  eXBL_InProperty,
+  eXBL_InField,
+  eXBL_InBody,
+  eXBL_InGetter,
+  eXBL_InSetter,
+  eXBL_InConstructor,
+  eXBL_InDestructor
+} XBLSecondaryState;
+
+class nsXULPrototypeElement;
+class nsXBLProtoImplMember;
+class nsXBLProtoImplProperty;
+class nsXBLProtoImplMethod;
+class nsXBLProtoImplField;
+class nsXBLPrototypeBinding;
+
+// The XBL content sink overrides the XML content sink to
+// builds its own lightweight data structures for the <resources>,
+// <handlers>, <implementation>, and 
+
+class nsXBLContentSink : public nsXMLContentSink {
+public:
+  nsXBLContentSink();
+  ~nsXBLContentSink();
+
+  NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
+
+  nsresult Init(nsIDocument* aDoc,
+                nsIURI* aURL,
+                nsISupports* aContainer);
+
+  // nsIContentSink overrides
+  NS_IMETHOD HandleStartElement(const char16_t *aName, 
+                                const char16_t **aAtts, 
+                                uint32_t aAttsCount, 
+                                uint32_t aLineNumber) override;
+
+  NS_IMETHOD HandleEndElement(const char16_t *aName) override;
+  
+  NS_IMETHOD HandleCDataSection(const char16_t *aData, 
+                                uint32_t aLength) override;
+
+protected:
+    // nsXMLContentSink overrides
+    virtual void MaybeStartLayout(bool aIgnorePendingSheets) override;
+
+    bool OnOpenContainer(const char16_t **aAtts, 
+                           uint32_t aAttsCount, 
+                           int32_t aNameSpaceID, 
+                           nsIAtom* aTagName,
+                           uint32_t aLineNumber) override;
+
+    bool NotifyForDocElement() override { return false; }
+
+    nsresult CreateElement(const char16_t** aAtts, uint32_t aAttsCount,
+                           mozilla::dom::NodeInfo* aNodeInfo, uint32_t aLineNumber,
+                           nsIContent** aResult, bool* aAppendContent,
+                           mozilla::dom::FromParser aFromParser) override;
+    
+    nsresult AddAttributes(const char16_t** aAtts, 
+                           nsIContent* aContent) override;
+
+#ifdef MOZ_XUL    
+    nsresult AddAttributesToXULPrototype(const char16_t **aAtts, 
+                                         uint32_t aAttsCount, 
+                                         nsXULPrototypeElement* aElement);
+#endif
+
+    // Our own helpers for constructing XBL prototype objects.
+    nsresult ConstructBinding(uint32_t aLineNumber);
+    void ConstructHandler(const char16_t **aAtts, uint32_t aLineNumber);
+    void ConstructResource(const char16_t **aAtts, nsIAtom* aResourceType);
+    void ConstructImplementation(const char16_t **aAtts);
+    void ConstructProperty(const char16_t **aAtts, uint32_t aLineNumber);
+    void ConstructMethod(const char16_t **aAtts);
+    void ConstructParameter(const char16_t **aAtts);
+    void ConstructField(const char16_t **aAtts, uint32_t aLineNumber);
+  
+
+  // nsXMLContentSink overrides
+  nsresult FlushText(bool aReleaseTextNode = true) override;
+
+  // nsIExpatSink overrides
+  NS_IMETHOD ReportError(const char16_t* aErrorText,
+                         const char16_t* aSourceText,
+                         nsIScriptError *aError,
+                         bool *_retval) override;
+
+protected:
+  nsresult ReportUnexpectedElement(nsIAtom* aElementName, uint32_t aLineNumber);
+
+  void AddMember(nsXBLProtoImplMember* aMember);
+  void AddField(nsXBLProtoImplField* aField);
+  
+  XBLPrimaryState mState;
+  XBLSecondaryState mSecondaryState;
+  nsXBLDocumentInfo* mDocInfo;
+  bool mIsChromeOrResource; // For bug #45989
+  bool mFoundFirstBinding;
+
+  nsString mCurrentBindingID;
+
+  nsXBLPrototypeBinding* mBinding;
+  nsXBLPrototypeHandler* mHandler; // current handler, owned by its PrototypeBinding
+  nsXBLProtoImpl* mImplementation;
+  nsXBLProtoImplMember* mImplMember;
+  nsXBLProtoImplField* mImplField;
+  nsXBLProtoImplProperty* mProperty;
+  nsXBLProtoImplMethod* mMethod;
+  nsXBLProtoImplField* mField;
+};
+
+nsresult
+NS_NewXBLContentSink(nsIXMLContentSink** aResult,
+                     nsIDocument* aDoc,
+                     nsIURI* aURL,
+                     nsISupports* aContainer);
+#endif // nsXBLContentSink_h__
diff --git a/dom/xbl/nsXBLDocumentInfo.cpp b/dom/xbl/nsXBLDocumentInfo.cpp
new file mode 100644
index 0000000000..283775dc69
--- /dev/null
+++ b/dom/xbl/nsXBLDocumentInfo.cpp
@@ -0,0 +1,325 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/DebugOnly.h"
+
+#include "nsXBLDocumentInfo.h"
+#include "nsIDocument.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsIScriptObjectPrincipal.h"
+#include "nsIScriptContext.h"
+#include "nsIDOMDocument.h"
+#include "jsapi.h"
+#include "jsfriendapi.h"
+#include "nsIURI.h"
+#include "nsIConsoleService.h"
+#include "nsIScriptError.h"
+#include "nsIChromeRegistry.h"
+#include "nsIPrincipal.h"
+#include "nsJSPrincipals.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsContentUtils.h"
+#include "nsDOMJSUtils.h"
+#include "mozilla/Services.h"
+#include "xpcpublic.h"
+#include "mozilla/scache/StartupCache.h"
+#include "mozilla/scache/StartupCacheUtils.h"
+#include "nsCCUncollectableMarker.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/URL.h"
+
+using namespace mozilla;
+using namespace mozilla::scache;
+using namespace mozilla::dom;
+
+static const char kXBLCachePrefix[] = "xblcache";
+
+/* Implementation file */
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsXBLDocumentInfo)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXBLDocumentInfo)
+  if (tmp->mBindingTable) {
+    for (auto iter = tmp->mBindingTable->ConstIter();
+         !iter.Done(); iter.Next()) {
+      iter.UserData()->Unlink();
+    }
+  }
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLDocumentInfo)
+  if (tmp->mDocument &&
+      nsCCUncollectableMarker::InGeneration(cb, tmp->mDocument->GetMarkedCCGeneration())) {
+    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+    return NS_SUCCESS_INTERRUPTED_TRAVERSE;
+  }
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
+  if (tmp->mBindingTable) {
+    for (auto iter = tmp->mBindingTable->ConstIter();
+         !iter.Done(); iter.Next()) {
+      iter.UserData()->Traverse(cb);
+    }
+  }
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXBLDocumentInfo)
+  if (tmp->mBindingTable) {
+    for (auto iter = tmp->mBindingTable->ConstIter();
+         !iter.Done(); iter.Next()) {
+      iter.UserData()->Trace(aCallbacks, aClosure);
+    }
+  }
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+static void
+UnmarkXBLJSObject(JS::GCCellPtr aPtr, const char* aName, void* aClosure)
+{
+  JS::ExposeObjectToActiveJS(&aPtr.as<JSObject>());
+}
+
+void
+nsXBLDocumentInfo::MarkInCCGeneration(uint32_t aGeneration)
+{
+  if (mDocument) {
+    mDocument->MarkUncollectableForCCGeneration(aGeneration);
+  }
+  // Unmark any JS we hold
+  if (mBindingTable) {
+    for (auto iter = mBindingTable->Iter(); !iter.Done(); iter.Next()) {
+      iter.UserData()->Trace(TraceCallbackFunc(UnmarkXBLJSObject), nullptr);
+    }
+  }
+}
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXBLDocumentInfo)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXBLDocumentInfo)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXBLDocumentInfo)
+
+nsXBLDocumentInfo::nsXBLDocumentInfo(nsIDocument* aDocument)
+  : mDocument(aDocument),
+    mScriptAccess(true),
+    mIsChrome(false),
+    mFirstBinding(nullptr)
+{
+  nsIURI* uri = aDocument->GetDocumentURI();
+  if (IsChromeURI(uri)) {
+    // Cache whether or not this chrome XBL can execute scripts.
+    nsCOMPtr<nsIXULChromeRegistry> reg =
+      mozilla::services::GetXULChromeRegistryService();
+    if (reg) {
+      bool allow = true;
+      reg->AllowScriptsForPackage(uri, &allow);
+      mScriptAccess = allow;
+    }
+    mIsChrome = true;
+  } else {
+    // If this binding isn't running with system principal, then it's running
+    // from a remote-XUL whitelisted domain. This is already a not-really-
+    // supported configuration (among other things, we don't use XBL scopes in
+    // that configuration for compatibility reasons). But we should still at
+    // least make an effort to prevent binding code from running if content
+    // script is disabled or if the source domain is blacklisted (since the
+    // source domain for remote XBL must always be the same as the source domain
+    // of the bound content).
+    //
+    // If we just ask the binding document if script is enabled, it will
+    // discover that it has no inner window, and return false. So instead, we
+    // short-circuit the normal compartment-managed script-disabling machinery,
+    // and query the policy for the URI directly.
+    bool allow;
+    nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
+    nsresult rv = ssm->PolicyAllowsScript(uri, &allow);
+    mScriptAccess = NS_SUCCEEDED(rv) && allow;
+  }
+}
+
+nsXBLDocumentInfo::~nsXBLDocumentInfo()
+{
+  mozilla::DropJSObjects(this);
+}
+
+nsXBLPrototypeBinding*
+nsXBLDocumentInfo::GetPrototypeBinding(const nsACString& aRef)
+{
+  if (!mBindingTable)
+    return nullptr;
+
+  if (aRef.IsEmpty()) {
+    // Return our first binding
+    return mFirstBinding;
+  }
+
+  return mBindingTable->Get(aRef);
+}
+
+nsresult
+nsXBLDocumentInfo::SetPrototypeBinding(const nsACString& aRef, nsXBLPrototypeBinding* aBinding)
+{
+  if (!mBindingTable) {
+    mBindingTable = new nsClassHashtable<nsCStringHashKey, nsXBLPrototypeBinding>();
+    mozilla::HoldJSObjects(this);
+  }
+
+  NS_ENSURE_STATE(!mBindingTable->Get(aRef));
+  mBindingTable->Put(aRef, aBinding);
+
+  return NS_OK;
+}
+
+void
+nsXBLDocumentInfo::RemovePrototypeBinding(const nsACString& aRef)
+{
+  if (mBindingTable) {
+    nsAutoPtr<nsXBLPrototypeBinding> bindingToRemove;
+    mBindingTable->RemoveAndForget(aRef, bindingToRemove);
+
+    // We do not want to destroy the binding, so just forget it.
+    bindingToRemove.forget();
+  }
+}
+
+// static
+nsresult
+nsXBLDocumentInfo::ReadPrototypeBindings(nsIURI* aURI, nsXBLDocumentInfo** aDocInfo)
+{
+  *aDocInfo = nullptr;
+
+  nsAutoCString spec(kXBLCachePrefix);
+  nsresult rv = PathifyURI(aURI, spec);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  StartupCache* startupCache = StartupCache::GetSingleton();
+  if (!startupCache) {
+    return NS_ERROR_FAILURE;
+  }
+
+  UniquePtr<char[]> buf;
+  uint32_t len;
+  rv = startupCache->GetBuffer(spec.get(), &buf, &len);
+  // GetBuffer will fail if the binding is not in the cache.
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsCOMPtr<nsIObjectInputStream> stream;
+  rv = NewObjectInputStreamFromBuffer(Move(buf), len, getter_AddRefs(stream));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // The file compatibility.ini stores the build id. This is checked in
+  // nsAppRunner.cpp and will delete the cache if a different build is
+  // present. However, we check that the version matches here to be safe. 
+  uint32_t version;
+  rv = stream->Read32(&version);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (version != XBLBinding_Serialize_Version) {
+    // The version that exists is different than expected, likely created with a
+    // different build, so invalidate the cache.
+    startupCache->InvalidateCache();
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal;
+  nsContentUtils::GetSecurityManager()->
+    GetSystemPrincipal(getter_AddRefs(principal));
+
+  nsCOMPtr<nsIDOMDocument> domdoc;
+  rv = NS_NewXBLDocument(getter_AddRefs(domdoc), aURI, nullptr, principal);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIDocument> doc = do_QueryInterface(domdoc);
+  NS_ASSERTION(doc, "Must have a document!");
+  RefPtr<nsXBLDocumentInfo> docInfo = new nsXBLDocumentInfo(doc);
+
+  while (1) {
+    uint8_t flags;
+    nsresult rv = stream->Read8(&flags);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (flags == XBLBinding_Serialize_NoMoreBindings)
+      break;
+
+    rv = nsXBLPrototypeBinding::ReadNewBinding(stream, docInfo, doc, flags);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  docInfo.forget(aDocInfo);
+  return NS_OK;
+}
+
+nsresult
+nsXBLDocumentInfo::WritePrototypeBindings()
+{
+  // Only write out bindings with the system principal
+  if (!nsContentUtils::IsSystemPrincipal(mDocument->NodePrincipal()))
+    return NS_OK;
+
+  nsAutoCString spec(kXBLCachePrefix);
+  nsresult rv = PathifyURI(DocumentURI(), spec);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  StartupCache* startupCache = StartupCache::GetSingleton();
+  if (!startupCache) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIObjectOutputStream> stream;
+  nsCOMPtr<nsIStorageStream> storageStream;
+  rv = NewObjectOutputWrappedStorageStream(getter_AddRefs(stream),
+                                           getter_AddRefs(storageStream),
+                                           true);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stream->Write32(XBLBinding_Serialize_Version);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (mBindingTable) {
+    for (auto iter = mBindingTable->Iter(); !iter.Done(); iter.Next()) {
+      iter.UserData()->Write(stream);
+    }
+  }
+
+  // write a end marker at the end
+  rv = stream->Write8(XBLBinding_Serialize_NoMoreBindings);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  stream->Close();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t len;
+  UniquePtr<char[]> buf;
+  rv = NewBufferFromStorageStream(storageStream, &buf, &len);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return startupCache->PutBuffer(spec.get(), buf.get(), len);
+}
+
+void
+nsXBLDocumentInfo::SetFirstPrototypeBinding(nsXBLPrototypeBinding* aBinding)
+{
+  mFirstBinding = aBinding;
+}
+
+void
+nsXBLDocumentInfo::FlushSkinStylesheets()
+{
+  if (mBindingTable) {
+    for (auto iter = mBindingTable->Iter(); !iter.Done(); iter.Next()) {
+      iter.UserData()->FlushSkinSheets();
+    }
+  }
+}
+
+#ifdef DEBUG
+void
+AssertInCompilationScope()
+{
+  AutoJSContext cx;
+  MOZ_ASSERT(xpc::CompilationScope() == JS::CurrentGlobalOrNull(cx));
+}
+#endif
diff --git a/dom/xbl/nsXBLDocumentInfo.h b/dom/xbl/nsXBLDocumentInfo.h
new file mode 100644
index 0000000000..79ea005e02
--- /dev/null
+++ b/dom/xbl/nsXBLDocumentInfo.h
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLDocumentInfo_h__
+#define nsXBLDocumentInfo_h__
+
+#include "mozilla/Attributes.h"
+#include "nsCOMPtr.h"
+#include "nsAutoPtr.h"
+#include "nsWeakReference.h"
+#include "nsIDocument.h"
+#include "nsCycleCollectionParticipant.h"
+
+class nsXBLPrototypeBinding;
+
+class nsXBLDocumentInfo final : public nsSupportsWeakReference
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+
+  explicit nsXBLDocumentInfo(nsIDocument* aDocument);
+
+  already_AddRefed<nsIDocument> GetDocument()
+    { nsCOMPtr<nsIDocument> copy = mDocument; return copy.forget(); }
+
+  bool GetScriptAccess() const { return mScriptAccess; }
+
+  nsIURI* DocumentURI() { return mDocument->GetDocumentURI(); }
+
+  nsXBLPrototypeBinding* GetPrototypeBinding(const nsACString& aRef);
+  nsresult SetPrototypeBinding(const nsACString& aRef,
+                               nsXBLPrototypeBinding* aBinding);
+
+  // This removes the binding without deleting it
+  void RemovePrototypeBinding(const nsACString& aRef);
+
+  nsresult WritePrototypeBindings();
+
+  void SetFirstPrototypeBinding(nsXBLPrototypeBinding* aBinding);
+
+  void FlushSkinStylesheets();
+
+  bool IsChrome() { return mIsChrome; }
+
+  void MarkInCCGeneration(uint32_t aGeneration);
+
+  static nsresult ReadPrototypeBindings(nsIURI* aURI, nsXBLDocumentInfo** aDocInfo);
+
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsXBLDocumentInfo)
+
+private:
+  virtual ~nsXBLDocumentInfo();
+
+  nsCOMPtr<nsIDocument> mDocument;
+  bool mScriptAccess;
+  bool mIsChrome;
+  // the binding table owns each nsXBLPrototypeBinding
+  nsAutoPtr<nsClassHashtable<nsCStringHashKey, nsXBLPrototypeBinding>> mBindingTable;
+
+  // non-owning pointer to the first binding in the table
+  nsXBLPrototypeBinding* mFirstBinding;
+};
+
+#ifdef DEBUG
+void AssertInCompilationScope();
+#else
+inline void AssertInCompilationScope() {}
+#endif
+
+#endif
diff --git a/dom/xbl/nsXBLEventHandler.cpp b/dom/xbl/nsXBLEventHandler.cpp
new file mode 100644
index 0000000000..6a873cf3ba
--- /dev/null
+++ b/dom/xbl/nsXBLEventHandler.cpp
@@ -0,0 +1,187 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsCOMPtr.h"
+#include "nsIAtom.h"
+#include "nsIDOMEventListener.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsIDOMMouseEvent.h"
+#include "nsXBLPrototypeHandler.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
+#include "mozilla/dom/EventTarget.h"
+#include "mozilla/TextEvents.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsXBLEventHandler::nsXBLEventHandler(nsXBLPrototypeHandler* aHandler)
+  : mProtoHandler(aHandler)
+{
+}
+
+nsXBLEventHandler::~nsXBLEventHandler()
+{
+}
+
+NS_IMPL_ISUPPORTS(nsXBLEventHandler, nsIDOMEventListener)
+
+NS_IMETHODIMP
+nsXBLEventHandler::HandleEvent(nsIDOMEvent* aEvent)
+{
+  if (!mProtoHandler)
+    return NS_ERROR_FAILURE;
+
+  uint8_t phase = mProtoHandler->GetPhase();
+  if (phase == NS_PHASE_TARGET) {
+    uint16_t eventPhase;
+    aEvent->GetEventPhase(&eventPhase);
+    if (eventPhase != nsIDOMEvent::AT_TARGET)
+      return NS_OK;
+  }
+
+  if (!EventMatched(aEvent))
+    return NS_OK;
+
+  mProtoHandler->ExecuteHandler(aEvent->InternalDOMEvent()->GetCurrentTarget(),
+                                aEvent);
+
+  return NS_OK;
+}
+
+nsXBLMouseEventHandler::nsXBLMouseEventHandler(nsXBLPrototypeHandler* aHandler)
+  : nsXBLEventHandler(aHandler)
+{
+}
+
+nsXBLMouseEventHandler::~nsXBLMouseEventHandler()
+{
+}
+
+bool
+nsXBLMouseEventHandler::EventMatched(nsIDOMEvent* aEvent)
+{
+  nsCOMPtr<nsIDOMMouseEvent> mouse(do_QueryInterface(aEvent));
+  return mouse && mProtoHandler->MouseEventMatched(mouse);
+}
+
+nsXBLKeyEventHandler::nsXBLKeyEventHandler(nsIAtom* aEventType, uint8_t aPhase,
+                                           uint8_t aType)
+  : mEventType(aEventType),
+    mPhase(aPhase),
+    mType(aType),
+    mIsBoundToChrome(false),
+    mUsingContentXBLScope(false)
+{
+}
+
+nsXBLKeyEventHandler::~nsXBLKeyEventHandler()
+{
+}
+
+NS_IMPL_ISUPPORTS(nsXBLKeyEventHandler, nsIDOMEventListener)
+
+bool
+nsXBLKeyEventHandler::ExecuteMatchedHandlers(
+                        nsIDOMKeyEvent* aKeyEvent,
+                        uint32_t aCharCode,
+                        const IgnoreModifierState& aIgnoreModifierState)
+{
+  WidgetEvent* event = aKeyEvent->AsEvent()->WidgetEventPtr();
+  nsCOMPtr<EventTarget> target = aKeyEvent->AsEvent()->InternalDOMEvent()->GetCurrentTarget();
+
+  bool executed = false;
+  for (uint32_t i = 0; i < mProtoHandlers.Length(); ++i) {
+    nsXBLPrototypeHandler* handler = mProtoHandlers[i];
+    bool hasAllowUntrustedAttr = handler->HasAllowUntrustedAttr();
+    if ((event->IsTrusted() ||
+        (hasAllowUntrustedAttr && handler->AllowUntrustedEvents()) ||
+        (!hasAllowUntrustedAttr && !mIsBoundToChrome && !mUsingContentXBLScope)) &&
+        handler->KeyEventMatched(aKeyEvent, aCharCode, aIgnoreModifierState)) {
+      handler->ExecuteHandler(target, aKeyEvent->AsEvent());
+      executed = true;
+    }
+  }
+#ifdef XP_WIN
+  // Windows native applications ignore Windows-Logo key state when checking
+  // shortcut keys even if the key is pressed.  Therefore, if there is no
+  // shortcut key which exactly matches current modifier state, we should
+  // retry to look for a shortcut key without the Windows-Logo key press.
+  if (!executed && !aIgnoreModifierState.mOS) {
+    WidgetKeyboardEvent* keyEvent = event->AsKeyboardEvent();
+    if (keyEvent && keyEvent->IsOS()) {
+      IgnoreModifierState ignoreModifierState(aIgnoreModifierState);
+      ignoreModifierState.mOS = true;
+      return ExecuteMatchedHandlers(aKeyEvent, aCharCode, ignoreModifierState);
+    }
+  }
+#endif
+  return executed;
+}
+
+NS_IMETHODIMP
+nsXBLKeyEventHandler::HandleEvent(nsIDOMEvent* aEvent)
+{
+  uint32_t count = mProtoHandlers.Length();
+  if (count == 0)
+    return NS_ERROR_FAILURE;
+
+  if (mPhase == NS_PHASE_TARGET) {
+    uint16_t eventPhase;
+    aEvent->GetEventPhase(&eventPhase);
+    if (eventPhase != nsIDOMEvent::AT_TARGET)
+      return NS_OK;
+  }
+
+  nsCOMPtr<nsIDOMKeyEvent> key(do_QueryInterface(aEvent));
+  if (!key)
+    return NS_OK;
+
+  WidgetKeyboardEvent* nativeKeyboardEvent =
+    aEvent->WidgetEventPtr()->AsKeyboardEvent();
+  MOZ_ASSERT(nativeKeyboardEvent);
+  AutoShortcutKeyCandidateArray shortcutKeys;
+  nativeKeyboardEvent->GetShortcutKeyCandidates(shortcutKeys);
+
+  if (shortcutKeys.IsEmpty()) {
+    ExecuteMatchedHandlers(key, 0, IgnoreModifierState());
+    return NS_OK;
+  }
+
+  for (uint32_t i = 0; i < shortcutKeys.Length(); ++i) {
+    IgnoreModifierState ignoreModifierState;
+    ignoreModifierState.mShift = shortcutKeys[i].mIgnoreShift;
+    if (ExecuteMatchedHandlers(key, shortcutKeys[i].mCharCode,
+                               ignoreModifierState)) {
+      return NS_OK;
+    }
+  }
+  return NS_OK;
+}
+
+///////////////////////////////////////////////////////////////////////////////////
+
+already_AddRefed<nsXBLEventHandler>
+NS_NewXBLEventHandler(nsXBLPrototypeHandler* aHandler,
+                      nsIAtom* aEventType)
+{
+  RefPtr<nsXBLEventHandler> handler;
+
+  switch (nsContentUtils::GetEventClassID(nsDependentAtomString(aEventType))) {
+    case eDragEventClass:
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eSimpleGestureEventClass:
+      handler = new nsXBLMouseEventHandler(aHandler);
+      break;
+    default:
+      handler = new nsXBLEventHandler(aHandler);
+      break;
+  }
+
+  return handler.forget();
+}
diff --git a/dom/xbl/nsXBLEventHandler.h b/dom/xbl/nsXBLEventHandler.h
new file mode 100644
index 0000000000..8c74cabdb1
--- /dev/null
+++ b/dom/xbl/nsXBLEventHandler.h
@@ -0,0 +1,121 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLEventHandler_h__
+#define nsXBLEventHandler_h__
+
+#include "mozilla/Attributes.h"
+#include "nsCOMPtr.h"
+#include "nsIDOMEventListener.h"
+#include "nsTArray.h"
+
+class nsIAtom;
+class nsIDOMKeyEvent;
+class nsXBLPrototypeHandler;
+
+namespace mozilla {
+namespace dom {
+struct IgnoreModifierState;
+} // namespace dom
+} // namespace mozilla
+
+class nsXBLEventHandler : public nsIDOMEventListener
+{
+public:
+  explicit nsXBLEventHandler(nsXBLPrototypeHandler* aHandler);
+
+  NS_DECL_ISUPPORTS
+
+  NS_DECL_NSIDOMEVENTLISTENER
+
+protected:
+  virtual ~nsXBLEventHandler();
+  nsXBLPrototypeHandler* mProtoHandler;
+
+private:
+  nsXBLEventHandler();
+  virtual bool EventMatched(nsIDOMEvent* aEvent)
+  {
+    return true;
+  }
+};
+
+class nsXBLMouseEventHandler : public nsXBLEventHandler
+{
+public:
+  explicit nsXBLMouseEventHandler(nsXBLPrototypeHandler* aHandler);
+  virtual ~nsXBLMouseEventHandler();
+
+private:
+  bool EventMatched(nsIDOMEvent* aEvent) override;
+};
+
+class nsXBLKeyEventHandler : public nsIDOMEventListener
+{
+  typedef mozilla::dom::IgnoreModifierState IgnoreModifierState;
+
+public:
+  nsXBLKeyEventHandler(nsIAtom* aEventType, uint8_t aPhase, uint8_t aType);
+
+  NS_DECL_ISUPPORTS
+
+  NS_DECL_NSIDOMEVENTLISTENER
+
+  void AddProtoHandler(nsXBLPrototypeHandler* aProtoHandler)
+  {
+    mProtoHandlers.AppendElement(aProtoHandler);
+  }
+
+  bool Matches(nsIAtom* aEventType, uint8_t aPhase, uint8_t aType) const
+  {
+    return (mEventType == aEventType && mPhase == aPhase && mType == aType);
+  }
+
+  void GetEventName(nsAString& aString) const
+  {
+    mEventType->ToString(aString);
+  }
+
+  uint8_t GetPhase() const
+  {
+    return mPhase;
+  }
+
+  uint8_t GetType() const
+  {
+    return mType;
+  }
+
+  void SetIsBoundToChrome(bool aIsBoundToChrome)
+  {
+    mIsBoundToChrome = aIsBoundToChrome;
+  }
+
+  void SetUsingContentXBLScope(bool aUsingContentXBLScope)
+  {
+    mUsingContentXBLScope = aUsingContentXBLScope;
+  }
+
+private:
+  nsXBLKeyEventHandler();
+  virtual ~nsXBLKeyEventHandler();
+
+  bool ExecuteMatchedHandlers(nsIDOMKeyEvent* aEvent, uint32_t aCharCode,
+                              const IgnoreModifierState& aIgnoreModifierState);
+
+  nsTArray<nsXBLPrototypeHandler*> mProtoHandlers;
+  nsCOMPtr<nsIAtom> mEventType;
+  uint8_t mPhase;
+  uint8_t mType;
+  bool mIsBoundToChrome;
+  bool mUsingContentXBLScope;
+};
+
+already_AddRefed<nsXBLEventHandler>
+NS_NewXBLEventHandler(nsXBLPrototypeHandler* aHandler,
+                      nsIAtom* aEventType);
+
+#endif
diff --git a/dom/xbl/nsXBLMaybeCompiled.h b/dom/xbl/nsXBLMaybeCompiled.h
new file mode 100644
index 0000000000..d4b366b0ee
--- /dev/null
+++ b/dom/xbl/nsXBLMaybeCompiled.h
@@ -0,0 +1,172 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLMaybeCompiled_h__
+#define nsXBLMaybeCompiled_h__
+
+#include "js/GCAPI.h"
+
+/*
+ * A union containing either a pointer representing uncompiled source or a
+ * JSObject* representing the compiled result.  The class is templated on the
+ * source object type.
+ *
+ * The purpose of abstracting this as a separate class is to allow it to be
+ * wrapped in a JS::Heap<T> to correctly handle post-barriering of the JSObject
+ * pointer, when present.
+ *
+ * No implementation of rootKind() is provided, which prevents
+ * Root<nsXBLMaybeCompiled<UncompiledT>> from being used.
+ */
+template <class UncompiledT>
+class nsXBLMaybeCompiled
+{
+public:
+  nsXBLMaybeCompiled() : mUncompiled(BIT_UNCOMPILED) {}
+
+  explicit nsXBLMaybeCompiled(UncompiledT* uncompiled)
+    : mUncompiled(reinterpret_cast<uintptr_t>(uncompiled) | BIT_UNCOMPILED) {}
+
+  explicit nsXBLMaybeCompiled(JSObject* compiled) : mCompiled(compiled) {}
+
+  bool IsCompiled() const
+  {
+    return !(mUncompiled & BIT_UNCOMPILED);
+  }
+
+  UncompiledT* GetUncompiled() const
+  {
+    MOZ_ASSERT(!IsCompiled(), "Attempt to get compiled function as uncompiled");
+    uintptr_t unmasked = mUncompiled & ~BIT_UNCOMPILED;
+    return reinterpret_cast<UncompiledT*>(unmasked);
+  }
+
+  JSObject* GetJSFunction() const
+  {
+    MOZ_ASSERT(IsCompiled(), "Attempt to get uncompiled function as compiled");
+    if (mCompiled) {
+      JS::ExposeObjectToActiveJS(mCompiled);
+    }
+    return mCompiled;
+  }
+
+  // This is appropriate for use in tracing methods, etc.
+  JSObject* GetJSFunctionPreserveColor() const
+  {
+    MOZ_ASSERT(IsCompiled(), "Attempt to get uncompiled function as compiled");
+    return mCompiled;
+  }
+
+private:
+  JSObject*& UnsafeGetJSFunction()
+  {
+    MOZ_ASSERT(IsCompiled(), "Attempt to get uncompiled function as compiled");
+    return mCompiled;
+  }
+
+  enum { BIT_UNCOMPILED = 1 << 0 };
+
+  union
+  {
+    // An pointer that represents the function before being compiled, with
+    // BIT_UNCOMPILED set.
+    uintptr_t mUncompiled;
+
+    // The JS object for the compiled result.
+    JSObject* mCompiled;
+  };
+
+  friend struct js::BarrierMethods<nsXBLMaybeCompiled<UncompiledT>>;
+};
+
+/* Add support for JS::Heap<nsXBLMaybeCompiled>. */
+namespace JS {
+
+template <class UncompiledT>
+struct GCPolicy<nsXBLMaybeCompiled<UncompiledT>>
+{
+  static nsXBLMaybeCompiled<UncompiledT> initial() { return nsXBLMaybeCompiled<UncompiledT>(); }
+};
+
+} // namespace JS
+
+namespace js {
+
+template <class UncompiledT>
+struct BarrierMethods<nsXBLMaybeCompiled<UncompiledT>>
+{
+  typedef struct BarrierMethods<JSObject *> Base;
+
+  static void postBarrier(nsXBLMaybeCompiled<UncompiledT>* functionp,
+                          nsXBLMaybeCompiled<UncompiledT> prev,
+                          nsXBLMaybeCompiled<UncompiledT> next)
+  {
+    if (next.IsCompiled()) {
+      Base::postBarrier(&functionp->UnsafeGetJSFunction(),
+                        prev.IsCompiled() ? prev.UnsafeGetJSFunction() : nullptr,
+                        next.UnsafeGetJSFunction());
+    } else if (prev.IsCompiled()) {
+      Base::postBarrier(&prev.UnsafeGetJSFunction(),
+                        prev.UnsafeGetJSFunction(),
+                        nullptr);
+    }
+  }
+  static void exposeToJS(nsXBLMaybeCompiled<UncompiledT> fun) {
+    if (fun.IsCompiled()) {
+      JS::ExposeObjectToActiveJS(fun.UnsafeGetJSFunction());
+    }
+  }
+};
+
+template <class T>
+struct IsHeapConstructibleType<nsXBLMaybeCompiled<T>>
+{ // Yes, this is the exception to the rule. Sorry.
+  static constexpr bool value = true;
+};
+
+template <class UncompiledT>
+class HeapBase<nsXBLMaybeCompiled<UncompiledT>>
+{
+  const JS::Heap<nsXBLMaybeCompiled<UncompiledT>>& wrapper() const {
+    return *static_cast<const JS::Heap<nsXBLMaybeCompiled<UncompiledT>>*>(this);
+  }
+
+  JS::Heap<nsXBLMaybeCompiled<UncompiledT>>& wrapper() {
+    return *static_cast<JS::Heap<nsXBLMaybeCompiled<UncompiledT>>*>(this);
+  }
+
+  const nsXBLMaybeCompiled<UncompiledT>* extract() const {
+    return wrapper().address();
+  }
+
+  nsXBLMaybeCompiled<UncompiledT>* extract() {
+    return wrapper().unsafeGet();
+  }
+
+public:
+  bool IsCompiled() const { return extract()->IsCompiled(); }
+  UncompiledT* GetUncompiled() const { return extract()->GetUncompiled(); }
+  JSObject* GetJSFunction() const { return extract()->GetJSFunction(); }
+  JSObject* GetJSFunctionPreserveColor() const { return extract()->GetJSFunctionPreserveColor(); }
+
+  void SetUncompiled(UncompiledT* source) {
+    wrapper() = nsXBLMaybeCompiled<UncompiledT>(source);
+  }
+
+  void SetJSFunction(JSObject* function) {
+    wrapper() = nsXBLMaybeCompiled<UncompiledT>(function);
+  }
+
+  JS::Heap<JSObject*>& AsHeapObject()
+  {
+    MOZ_ASSERT(extract()->IsCompiled());
+    return *reinterpret_cast<JS::Heap<JSObject*>*>(this);
+  }
+};
+
+} /* namespace js */
+
+#endif // nsXBLMaybeCompiled_h__
diff --git a/dom/xbl/nsXBLProtoImpl.cpp b/dom/xbl/nsXBLProtoImpl.cpp
new file mode 100644
index 0000000000..4db9cabf01
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImpl.cpp
@@ -0,0 +1,535 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/DebugOnly.h"
+
+#include "nsXBLProtoImpl.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsContentUtils.h"
+#include "nsIXPConnect.h"
+#include "nsIServiceManager.h"
+#include "nsIDOMNode.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsXBLProtoImplProperty.h"
+#include "nsIURI.h"
+#include "mozilla/AddonPathService.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/XULElementBinding.h"
+#include "xpcpublic.h"
+#include "js/CharacterEncoding.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using js::GetGlobalForObjectCrossCompartment;
+using js::AssertSameCompartment;
+
+nsresult
+nsXBLProtoImpl::InstallImplementation(nsXBLPrototypeBinding* aPrototypeBinding,
+                                      nsXBLBinding* aBinding)
+{
+  // This function is called to install a concrete implementation on a bound element using
+  // this prototype implementation as a guide.  The prototype implementation is compiled lazily,
+  // so for the first bound element that needs a concrete implementation, we also build the
+  // prototype implementation.
+  if (!mMembers && !mFields)  // Constructor and destructor also live in mMembers
+    return NS_OK; // Nothing to do, so let's not waste time.
+
+  // If the way this gets the script context changes, fix
+  // nsXBLProtoImplAnonymousMethod::Execute
+  nsIDocument* document = aBinding->GetBoundElement()->OwnerDoc();
+
+  // This sometimes gets called when we have no outer window and if we don't
+  // catch this, we get leaks during crashtests and reftests.
+  if (NS_WARN_IF(!document->GetWindow())) {
+    return NS_OK;
+  }
+
+  // |propertyHolder| (below) can be an existing object, so in theory we might
+  // hit something that could end up running script. We never want that to
+  // happen here, so we use an AutoJSAPI instead of an AutoEntryScript.
+  dom::AutoJSAPI jsapi;
+  if (NS_WARN_IF(!jsapi.Init(document->GetScopeObject()))) {
+    return NS_OK;
+  }
+  JSContext* cx = jsapi.cx();
+
+  // InitTarget objects gives us back the JS object that represents the bound element and the
+  // class object in the bound document that represents the concrete version of this implementation.
+  // This function also has the side effect of building up the prototype implementation if it has
+  // not been built already.
+  JS::Rooted<JSObject*> targetClassObject(cx, nullptr);
+  bool targetObjectIsNew = false;
+  nsresult rv = InitTargetObjects(aPrototypeBinding,
+                                  aBinding->GetBoundElement(),
+                                  &targetClassObject,
+                                  &targetObjectIsNew);
+  NS_ENSURE_SUCCESS(rv, rv); // kick out if we were unable to properly intialize our target objects
+  MOZ_ASSERT(targetClassObject);
+
+  // If the prototype already existed, we don't need to install anything. return early.
+  if (!targetObjectIsNew)
+    return NS_OK;
+
+  // We want to define the canonical set of members in a safe place. If we're
+  // using a separate XBL scope, we want to define them there first (so that
+  // they'll be available for Xray lookups, among other things), and then copy
+  // the properties to the content-side prototype as needed. We don't need to
+  // bother about the field accessors here, since we don't use/support those
+  // for in-content bindings.
+
+  // First, start by entering the compartment of the XBL scope. This may or may
+  // not be the same compartment as globalObject.
+  JSAddonId* addonId = MapURIToAddonID(aPrototypeBinding->BindingURI());
+  JS::Rooted<JSObject*> globalObject(cx,
+    GetGlobalForObjectCrossCompartment(targetClassObject));
+  JS::Rooted<JSObject*> scopeObject(cx, xpc::GetScopeForXBLExecution(cx, globalObject, addonId));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+  MOZ_ASSERT(js::GetGlobalForObjectCrossCompartment(scopeObject) == scopeObject);
+  JSAutoCompartment ac(cx, scopeObject);
+
+  // Determine the appropriate property holder.
+  //
+  // Note: If |targetIsNew| is false, we'll early-return above. However, that only
+  // tells us if the content-side object is new, which may be the case even if
+  // we've already set up the binding on the XBL side. For example, if we apply
+  // a binding #foo to a <span> when we've already applied it to a <div>, we'll
+  // end up with a different content prototype, but we'll already have a property
+  // holder called |foo| in the XBL scope. Check for that to avoid wasteful and
+  // weird property holder duplication.
+  const char16_t* className = aPrototypeBinding->ClassName().get();
+  JS::Rooted<JSObject*> propertyHolder(cx);
+  JS::Rooted<JS::PropertyDescriptor> existingHolder(cx);
+  if (scopeObject != globalObject &&
+      !JS_GetOwnUCPropertyDescriptor(cx, scopeObject, className, &existingHolder)) {
+    return NS_ERROR_FAILURE;
+  }
+  bool propertyHolderIsNew = !existingHolder.object() || !existingHolder.value().isObject();
+
+  if (!propertyHolderIsNew) {
+    propertyHolder = &existingHolder.value().toObject();
+  } else if (scopeObject != globalObject) {
+
+    // This is just a property holder, so it doesn't need any special JSClass.
+    propertyHolder = JS_NewObjectWithGivenProto(cx, nullptr, nullptr);
+    NS_ENSURE_TRUE(propertyHolder, NS_ERROR_OUT_OF_MEMORY);
+
+    // Define it as a property on the scopeObject, using the same name used on
+    // the content side.
+    bool ok = JS_DefineUCProperty(cx, scopeObject, className, -1, propertyHolder,
+                                  JSPROP_PERMANENT | JSPROP_READONLY,
+                                  JS_STUBGETTER, JS_STUBSETTER);
+    NS_ENSURE_TRUE(ok, NS_ERROR_UNEXPECTED);
+  } else {
+    propertyHolder = targetClassObject;
+  }
+
+  // Walk our member list and install each one in turn on the XBL scope object.
+  if (propertyHolderIsNew) {
+    for (nsXBLProtoImplMember* curr = mMembers;
+         curr;
+         curr = curr->GetNext())
+      curr->InstallMember(cx, propertyHolder);
+  }
+
+  // Now, if we're using a separate XBL scope, enter the compartment of the
+  // bound node and copy exposable properties to the prototype there. This
+  // rewraps them appropriately, which should result in cross-compartment
+  // function wrappers.
+  if (propertyHolder != targetClassObject) {
+    AssertSameCompartment(propertyHolder, scopeObject);
+    AssertSameCompartment(targetClassObject, globalObject);
+    bool inContentXBLScope = xpc::IsInContentXBLScope(scopeObject);
+    for (nsXBLProtoImplMember* curr = mMembers; curr; curr = curr->GetNext()) {
+      if (!inContentXBLScope || curr->ShouldExposeToUntrustedContent()) {
+        JS::Rooted<jsid> id(cx);
+        JS::TwoByteChars chars(curr->GetName(), NS_strlen(curr->GetName()));
+        bool ok = JS_CharsToId(cx, chars, &id);
+        NS_ENSURE_TRUE(ok, NS_ERROR_UNEXPECTED);
+
+        bool found;
+        ok = JS_HasPropertyById(cx, propertyHolder, id, &found);
+        NS_ENSURE_TRUE(ok, NS_ERROR_UNEXPECTED);
+        if (!found) {
+          // Some members don't install anything in InstallMember (e.g.,
+          // nsXBLProtoImplAnonymousMethod). We need to skip copying in
+          // those cases.
+          continue;
+        }
+
+        ok = JS_CopyPropertyFrom(cx, id, targetClassObject, propertyHolder);
+        NS_ENSURE_TRUE(ok, NS_ERROR_UNEXPECTED);
+      }
+    }
+  }
+
+  // From here on out, work in the scope of the bound element.
+  JSAutoCompartment ac2(cx, targetClassObject);
+
+  // Install all of our field accessors.
+  for (nsXBLProtoImplField* curr = mFields;
+       curr;
+       curr = curr->GetNext())
+    curr->InstallAccessors(cx, targetClassObject);
+
+  return NS_OK;
+}
+
+nsresult 
+nsXBLProtoImpl::InitTargetObjects(nsXBLPrototypeBinding* aBinding,
+                                  nsIContent* aBoundElement, 
+                                  JS::MutableHandle<JSObject*> aTargetClassObject,
+                                  bool* aTargetIsNew)
+{
+  nsresult rv = NS_OK;
+
+  if (!mPrecompiledMemberHolder) {
+    rv = CompilePrototypeMembers(aBinding); // This is the first time we've ever installed this binding on an element.
+                                 // We need to go ahead and compile all methods and properties on a class
+                                 // in our prototype binding.
+    if (NS_FAILED(rv))
+      return rv;
+
+    MOZ_ASSERT(mPrecompiledMemberHolder);
+  }
+
+  nsIDocument *ownerDoc = aBoundElement->OwnerDoc();
+  nsIGlobalObject *sgo;
+
+  if (!(sgo = ownerDoc->GetScopeObject())) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // Because our prototype implementation has a class, we need to build up a corresponding
+  // class for the concrete implementation in the bound document.
+  AutoJSContext cx;
+  JS::Rooted<JSObject*> global(cx, sgo->GetGlobalJSObject());
+  JS::Rooted<JS::Value> v(cx);
+
+  JSAutoCompartment ac(cx, global);
+  // Make sure the interface object is created before the prototype object
+  // so that XULElement is hidden from content. See bug 909340.
+  bool defineOnGlobal = dom::XULElementBinding::ConstructorEnabled(cx, global);
+  dom::XULElementBinding::GetConstructorObjectHandle(cx, defineOnGlobal);
+
+  rv = nsContentUtils::WrapNative(cx, aBoundElement, &v,
+                                  /* aAllowWrapping = */ false);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  JS::Rooted<JSObject*> value(cx, &v.toObject());
+  JSAutoCompartment ac2(cx, value);
+
+  // All of the above code was just obtaining the bound element's script object and its immediate
+  // concrete base class.  We need to alter the object so that our concrete class is interposed
+  // between the object and its base class.  We become the new base class of the object, and the
+  // object's old base class becomes the new class' base class.
+  rv = aBinding->InitClass(mClassName, cx, value, aTargetClassObject, aTargetIsNew);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  aBoundElement->PreserveWrapper(aBoundElement);
+
+  return rv;
+}
+
+nsresult
+nsXBLProtoImpl::CompilePrototypeMembers(nsXBLPrototypeBinding* aBinding)
+{
+  // We want to pre-compile our implementation's members against a "prototype context". Then when we actually 
+  // bind the prototype to a real xbl instance, we'll clone the pre-compiled JS into the real instance's 
+  // context.
+  AutoJSAPI jsapi;
+  if (NS_WARN_IF(!jsapi.Init(xpc::CompilationScope())))
+    return NS_ERROR_FAILURE;
+  JSContext* cx = jsapi.cx();
+
+  mPrecompiledMemberHolder = JS_NewObjectWithGivenProto(cx, nullptr, nullptr);
+  if (!mPrecompiledMemberHolder)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // Now that we have a class object installed, we walk our member list and compile each of our
+  // properties and methods in turn.
+  JS::Rooted<JSObject*> rootedHolder(cx, mPrecompiledMemberHolder);
+  for (nsXBLProtoImplMember* curr = mMembers;
+       curr;
+       curr = curr->GetNext()) {
+    nsresult rv = curr->CompileMember(jsapi, mClassName, rootedHolder);
+    if (NS_FAILED(rv)) {
+      DestroyMembers();
+      return rv;
+    }
+  }
+
+  return NS_OK;
+}
+
+bool
+nsXBLProtoImpl::LookupMember(JSContext* aCx, nsString& aName,
+                             JS::Handle<jsid> aNameAsId,
+                             JS::MutableHandle<JS::PropertyDescriptor> aDesc,
+                             JS::Handle<JSObject*> aClassObject)
+{
+  for (nsXBLProtoImplMember* m = mMembers; m; m = m->GetNext()) {
+    if (aName.Equals(m->GetName())) {
+      return JS_GetPropertyDescriptorById(aCx, aClassObject, aNameAsId, aDesc);
+    }
+  }
+  return true;
+}
+
+void
+nsXBLProtoImpl::Trace(const TraceCallbacks& aCallbacks, void *aClosure)
+{
+  // If we don't have a class object then we either didn't compile members
+  // or we only have fields, in both cases there are no cycles through our
+  // members.
+  if (!mPrecompiledMemberHolder) {
+    return;
+  }
+
+  nsXBLProtoImplMember *member;
+  for (member = mMembers; member; member = member->GetNext()) {
+    member->Trace(aCallbacks, aClosure);
+  }
+}
+
+void
+nsXBLProtoImpl::UnlinkJSObjects()
+{
+  if (mPrecompiledMemberHolder) {
+    DestroyMembers();
+  }
+}
+
+nsXBLProtoImplField*
+nsXBLProtoImpl::FindField(const nsString& aFieldName) const
+{
+  for (nsXBLProtoImplField* f = mFields; f; f = f->GetNext()) {
+    if (aFieldName.Equals(f->GetName())) {
+      return f;
+    }
+  }
+
+  return nullptr;
+}
+
+bool
+nsXBLProtoImpl::ResolveAllFields(JSContext *cx, JS::Handle<JSObject*> obj) const
+{
+  for (nsXBLProtoImplField* f = mFields; f; f = f->GetNext()) {
+    nsDependentString name(f->GetName());
+    bool dummy;
+    if (!::JS_HasUCProperty(cx, obj, name.get(), name.Length(), &dummy)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+void
+nsXBLProtoImpl::UndefineFields(JSContext *cx, JS::Handle<JSObject*> obj) const
+{
+  JSAutoRequest ar(cx);
+  for (nsXBLProtoImplField* f = mFields; f; f = f->GetNext()) {
+    nsDependentString name(f->GetName());
+
+    const char16_t* s = name.get();
+    bool hasProp;
+    if (::JS_AlreadyHasOwnUCProperty(cx, obj, s, name.Length(), &hasProp) &&
+        hasProp) {
+      JS::ObjectOpResult ignored;
+      ::JS_DeleteUCProperty(cx, obj, s, name.Length(), ignored);
+    }
+  }
+}
+
+void
+nsXBLProtoImpl::DestroyMembers()
+{
+  MOZ_ASSERT(mPrecompiledMemberHolder);
+
+  delete mMembers;
+  mMembers = nullptr;
+  mConstructor = nullptr;
+  mDestructor = nullptr;
+}
+
+nsresult
+nsXBLProtoImpl::Read(nsIObjectInputStream* aStream,
+                     nsXBLPrototypeBinding* aBinding)
+{
+  AssertInCompilationScope();
+  AutoJSContext cx;
+  // Set up a class object first so that deserialization is possible
+  mPrecompiledMemberHolder = JS_NewObjectWithGivenProto(cx, nullptr, nullptr);
+  if (!mPrecompiledMemberHolder)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  nsXBLProtoImplField* previousField = nullptr;
+  nsXBLProtoImplMember* previousMember = nullptr;
+
+  do {
+    XBLBindingSerializeDetails type;
+    nsresult rv = aStream->Read8(&type);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (type == XBLBinding_Serialize_NoMoreItems)
+      break;
+
+    switch (type & XBLBinding_Serialize_Mask) {
+      case XBLBinding_Serialize_Field:
+      {
+        nsXBLProtoImplField* field =
+          new nsXBLProtoImplField(type & XBLBinding_Serialize_ReadOnly);
+        rv = field->Read(aStream);
+        if (NS_FAILED(rv)) {
+          delete field;
+          return rv;
+        }
+
+        if (previousField) {
+          previousField->SetNext(field);
+        }
+        else {
+          mFields = field;
+        }
+        previousField = field;
+
+        break;
+      }
+      case XBLBinding_Serialize_GetterProperty:
+      case XBLBinding_Serialize_SetterProperty:
+      case XBLBinding_Serialize_GetterSetterProperty:
+      {
+        nsAutoString name;
+        nsresult rv = aStream->ReadString(name);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        nsXBLProtoImplProperty* prop =
+          new nsXBLProtoImplProperty(name.get(), type & XBLBinding_Serialize_ReadOnly);
+        rv = prop->Read(aStream, type & XBLBinding_Serialize_Mask);
+        if (NS_FAILED(rv)) {
+          delete prop;
+          return rv;
+        }
+
+        previousMember = AddMember(prop, previousMember);
+        break;
+      }
+      case XBLBinding_Serialize_Method:
+      {
+        nsAutoString name;
+        rv = aStream->ReadString(name);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        nsXBLProtoImplMethod* method = new nsXBLProtoImplMethod(name.get());
+        rv = method->Read(aStream);
+        if (NS_FAILED(rv)) {
+          delete method;
+          return rv;
+        }
+
+        previousMember = AddMember(method, previousMember);
+        break;
+      }
+      case XBLBinding_Serialize_Constructor:
+      {
+        nsAutoString name;
+        rv = aStream->ReadString(name);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        mConstructor = new nsXBLProtoImplAnonymousMethod(name.get());
+        rv = mConstructor->Read(aStream);
+        if (NS_FAILED(rv)) {
+          delete mConstructor;
+          mConstructor = nullptr;
+          return rv;
+        }
+
+        previousMember = AddMember(mConstructor, previousMember);
+        break;
+      }
+      case XBLBinding_Serialize_Destructor:
+      {
+        nsAutoString name;
+        rv = aStream->ReadString(name);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        mDestructor = new nsXBLProtoImplAnonymousMethod(name.get());
+        rv = mDestructor->Read(aStream);
+        if (NS_FAILED(rv)) {
+          delete mDestructor;
+          mDestructor = nullptr;
+          return rv;
+        }
+
+        previousMember = AddMember(mDestructor, previousMember);
+        break;
+      }
+      default:
+        NS_ERROR("Unexpected binding member type");
+        break;
+    }
+  } while (1);
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImpl::Write(nsIObjectOutputStream* aStream,
+                      nsXBLPrototypeBinding* aBinding)
+{
+  nsresult rv;
+
+  if (!mPrecompiledMemberHolder) {
+    rv = CompilePrototypeMembers(aBinding);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = aStream->WriteUtf8Z(mClassName.get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (nsXBLProtoImplField* curr = mFields; curr; curr = curr->GetNext()) {
+    rv = curr->Write(aStream);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  for (nsXBLProtoImplMember* curr = mMembers; curr; curr = curr->GetNext()) {
+    if (curr == mConstructor) {
+      rv = mConstructor->Write(aStream, XBLBinding_Serialize_Constructor);
+    }
+    else if (curr == mDestructor) {
+      rv = mDestructor->Write(aStream, XBLBinding_Serialize_Destructor);
+    }
+    else {
+      rv = curr->Write(aStream);
+    }
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return aStream->Write8(XBLBinding_Serialize_NoMoreItems);
+}
+
+void
+NS_NewXBLProtoImpl(nsXBLPrototypeBinding* aBinding, 
+                   const char16_t* aClassName, 
+                   nsXBLProtoImpl** aResult)
+{
+  nsXBLProtoImpl* impl = new nsXBLProtoImpl();
+  if (aClassName) {
+    impl->mClassName = aClassName;
+  } else {
+    nsCString spec;
+    nsresult rv = aBinding->BindingURI()->GetSpec(spec);
+    // XXX: should handle this better
+    MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+    impl->mClassName = NS_ConvertUTF8toUTF16(spec);
+  }
+
+  aBinding->SetImplementation(impl);
+  *aResult = impl;
+}
+
diff --git a/dom/xbl/nsXBLProtoImpl.h b/dom/xbl/nsXBLProtoImpl.h
new file mode 100644
index 0000000000..d65637ac24
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImpl.h
@@ -0,0 +1,125 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLProtoImpl_h__
+#define nsXBLProtoImpl_h__
+
+#include "nsMemory.h"
+#include "nsXBLPrototypeHandler.h"
+#include "nsXBLProtoImplMember.h"
+#include "nsXBLProtoImplField.h"
+#include "nsXBLBinding.h"
+
+class nsXBLPrototypeBinding;
+class nsXBLProtoImplAnonymousMethod;
+
+class nsXBLProtoImpl final
+{
+public:
+  nsXBLProtoImpl()
+    : mPrecompiledMemberHolder(nullptr),
+      mMembers(nullptr),
+      mFields(nullptr),
+      mConstructor(nullptr),
+      mDestructor(nullptr)
+  {
+    MOZ_COUNT_CTOR(nsXBLProtoImpl);
+  }
+  ~nsXBLProtoImpl()
+  {
+    MOZ_COUNT_DTOR(nsXBLProtoImpl);
+    // Note: the constructor and destructor are in mMembers, so we'll
+    // clean them up automatically.
+    delete mMembers;
+    delete mFields;
+  }
+
+
+  nsresult InstallImplementation(nsXBLPrototypeBinding* aPrototypeBinding, nsXBLBinding* aBinding);
+
+private:
+  nsresult InitTargetObjects(nsXBLPrototypeBinding* aBinding,
+                             nsIContent* aBoundElement,
+                             JS::MutableHandle<JSObject*> aTargetClassObject,
+                             bool* aTargetIsNew);
+
+public:
+  nsresult CompilePrototypeMembers(nsXBLPrototypeBinding* aBinding);
+
+  bool LookupMember(JSContext* aCx, nsString& aName, JS::Handle<jsid> aNameAsId,
+                    JS::MutableHandle<JS::PropertyDescriptor> aDesc,
+                    JS::Handle<JSObject*> aClassObject);
+
+  void SetMemberList(nsXBLProtoImplMember* aMemberList)
+  {
+    delete mMembers;
+    mMembers = aMemberList;
+  }
+
+  void SetFieldList(nsXBLProtoImplField* aFieldList)
+  {
+    delete mFields;
+    mFields = aFieldList;
+  }
+
+  void Trace(const TraceCallbacks& aCallbacks, void *aClosure);
+  void UnlinkJSObjects();
+
+  nsXBLProtoImplField* FindField(const nsString& aFieldName) const;
+
+  // Resolve all the fields for this implementation on the object |obj| False
+  // return means a JS exception was set.
+  bool ResolveAllFields(JSContext *cx, JS::Handle<JSObject*> obj) const;
+
+  // Undefine all our fields from object |obj| (which should be a
+  // JSObject for a bound element).
+  void UndefineFields(JSContext* cx, JS::Handle<JSObject*> obj) const;
+
+  bool CompiledMembers() const {
+    return mPrecompiledMemberHolder != nullptr;
+  }
+
+  nsresult Read(nsIObjectInputStream* aStream,
+                nsXBLPrototypeBinding* aBinding);
+  nsresult Write(nsIObjectOutputStream* aStream,
+                 nsXBLPrototypeBinding* aBinding);
+
+protected:
+  // used by Read to add each member
+  nsXBLProtoImplMember* AddMember(nsXBLProtoImplMember* aMember,
+                                  nsXBLProtoImplMember* aPreviousMember)
+  {
+    if (aPreviousMember)
+      aPreviousMember->SetNext(aMember);
+    else
+      mMembers = aMember;
+    return aMember;
+  }
+
+  void DestroyMembers();
+
+public:
+  nsString mClassName; // The name of the class.
+
+protected:
+  JSObject* mPrecompiledMemberHolder; // The class object for the binding. We'll use this to pre-compile properties
+                          // and methods for the binding.
+
+  nsXBLProtoImplMember* mMembers; // The members of an implementation are chained in this singly-linked list.
+
+  nsXBLProtoImplField* mFields; // Our fields
+
+public:
+  nsXBLProtoImplAnonymousMethod* mConstructor; // Our class constructor.
+  nsXBLProtoImplAnonymousMethod* mDestructor;  // Our class destructor.
+};
+
+void
+NS_NewXBLProtoImpl(nsXBLPrototypeBinding* aBinding,
+                   const char16_t* aClassName,
+                   nsXBLProtoImpl** aResult);
+
+#endif // nsXBLProtoImpl_h__
diff --git a/dom/xbl/nsXBLProtoImplField.cpp b/dom/xbl/nsXBLProtoImplField.cpp
new file mode 100644
index 0000000000..9c9857f1df
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplField.cpp
@@ -0,0 +1,510 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAtom.h"
+#include "nsIContent.h"
+#include "nsString.h"
+#include "nsJSUtils.h"
+#include "jsapi.h"
+#include "js/CharacterEncoding.h"
+#include "nsUnicharUtils.h"
+#include "nsReadableUtils.h"
+#include "nsXBLProtoImplField.h"
+#include "nsIScriptContext.h"
+#include "nsIURI.h"
+#include "nsXBLSerialize.h"
+#include "nsXBLPrototypeBinding.h"
+#include "mozilla/AddonPathService.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/ElementBinding.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "nsGlobalWindow.h"
+#include "xpcpublic.h"
+#include "WrapperFactory.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsXBLProtoImplField::nsXBLProtoImplField(const char16_t* aName, const char16_t* aReadOnly)
+  : mNext(nullptr),
+    mFieldText(nullptr),
+    mFieldTextLength(0),
+    mLineNumber(0)
+{
+  MOZ_COUNT_CTOR(nsXBLProtoImplField);
+  mName = NS_strdup(aName);  // XXXbz make more sense to use a stringbuffer?
+  
+  mJSAttributes = JSPROP_ENUMERATE;
+  if (aReadOnly) {
+    nsAutoString readOnly; readOnly.Assign(aReadOnly);
+    if (readOnly.LowerCaseEqualsLiteral("true"))
+      mJSAttributes |= JSPROP_READONLY;
+  }
+}
+
+
+nsXBLProtoImplField::nsXBLProtoImplField(const bool aIsReadOnly)
+  : mNext(nullptr),
+    mFieldText(nullptr),
+    mFieldTextLength(0),
+    mLineNumber(0)
+{
+  MOZ_COUNT_CTOR(nsXBLProtoImplField);
+
+  mJSAttributes = JSPROP_ENUMERATE;
+  if (aIsReadOnly)
+    mJSAttributes |= JSPROP_READONLY;
+}
+
+nsXBLProtoImplField::~nsXBLProtoImplField()
+{
+  MOZ_COUNT_DTOR(nsXBLProtoImplField);
+  if (mFieldText)
+    free(mFieldText);
+  free(mName);
+  NS_CONTENT_DELETE_LIST_MEMBER(nsXBLProtoImplField, this, mNext);
+}
+
+void 
+nsXBLProtoImplField::AppendFieldText(const nsAString& aText)
+{
+  if (mFieldText) {
+    nsDependentString fieldTextStr(mFieldText, mFieldTextLength);
+    nsAutoString newFieldText = fieldTextStr + aText;
+    char16_t* temp = mFieldText;
+    mFieldText = ToNewUnicode(newFieldText);
+    mFieldTextLength = newFieldText.Length();
+    free(temp);
+  }
+  else {
+    mFieldText = ToNewUnicode(aText);
+    mFieldTextLength = aText.Length();
+  }
+}
+
+// XBL fields are represented on elements inheriting that field a bit trickily.
+// When setting up the XBL prototype object, we install accessors for the fields
+// on the prototype object. Those accessors, when used, will then (via
+// InstallXBLField below) reify a property for the field onto the actual XBL-backed
+// element.
+//
+// The accessor property is a plain old property backed by a getter function and
+// a setter function.  These properties are backed by the FieldGetter and
+// FieldSetter natives; they're created by InstallAccessors.  The precise field to be
+// reified is identified using two extra slots on the getter/setter functions.
+// XBLPROTO_SLOT stores the XBL prototype object that provides the field.
+// FIELD_SLOT stores the name of the field, i.e. its JavaScript property name.
+//
+// This two-step field installation process -- creating an accessor on the
+// prototype, then have that reify an own property on the actual element -- is
+// admittedly convoluted.  Better would be for XBL-backed elements to be proxies
+// that could resolve fields onto themselves.  But given that XBL bindings are
+// associated with elements mutably -- you can add/remove/change -moz-binding
+// whenever you want, alas -- doing so would require all elements to be proxies,
+// which isn't performant now.  So we do this two-step instead.
+static const uint32_t XBLPROTO_SLOT = 0;
+static const uint32_t FIELD_SLOT = 1;
+
+bool
+ValueHasISupportsPrivate(JS::Handle<JS::Value> v)
+{
+  if (!v.isObject()) {
+    return false;
+  }
+
+  const DOMJSClass* domClass = GetDOMClass(&v.toObject());
+  if (domClass) {
+    return domClass->mDOMObjectIsISupports;
+  }
+
+  const JSClass* clasp = ::JS_GetClass(&v.toObject());
+  const uint32_t HAS_PRIVATE_NSISUPPORTS =
+    JSCLASS_HAS_PRIVATE | JSCLASS_PRIVATE_IS_NSISUPPORTS;
+  return (clasp->flags & HAS_PRIVATE_NSISUPPORTS) == HAS_PRIVATE_NSISUPPORTS;
+}
+
+#ifdef DEBUG
+static bool
+ValueHasISupportsPrivate(JSContext* cx, const JS::Value& aVal)
+{
+    JS::Rooted<JS::Value> v(cx, aVal);
+    return ValueHasISupportsPrivate(v);
+}
+#endif
+
+// Define a shadowing property on |this| for the XBL field defined by the
+// contents of the callee's reserved slots.  If the property was defined,
+// *installed will be true, and idp will be set to the property name that was
+// defined.
+static bool
+InstallXBLField(JSContext* cx,
+                JS::Handle<JSObject*> callee, JS::Handle<JSObject*> thisObj,
+                JS::MutableHandle<jsid> idp, bool* installed)
+{
+  *installed = false;
+
+  // First ensure |this| is a reasonable XBL bound node.
+  //
+  // FieldAccessorGuard already determined whether |thisObj| was acceptable as
+  // |this| in terms of not throwing a TypeError.  Assert this for good measure.
+  MOZ_ASSERT(ValueHasISupportsPrivate(cx, JS::ObjectValue(*thisObj)));
+
+  // But there are some cases where we must accept |thisObj| but not install a
+  // property on it, or otherwise touch it.  Hence this split of |this|-vetting
+  // duties.
+  nsCOMPtr<nsISupports> native = xpc::UnwrapReflectorToISupports(thisObj);
+  if (!native) {
+    // Looks like whatever |thisObj| is it's not our nsIContent.  It might well
+    // be the proto our binding installed, however, where the private is the
+    // nsXBLDocumentInfo, so just baul out quietly.  Do NOT throw an exception
+    // here.
+    //
+    // We could make this stricter by checking the class maybe, but whatever.
+    return true;
+  }
+
+  nsCOMPtr<nsIContent> xblNode = do_QueryInterface(native);
+  if (!xblNode) {
+    xpc::Throw(cx, NS_ERROR_UNEXPECTED);
+    return false;
+  }
+
+  // Now that |this| is okay, actually install the field.
+
+  // Because of the possibility (due to XBL binding inheritance, because each
+  // XBL binding lives in its own global object) that |this| might be in a
+  // different compartment from the callee (not to mention that this method can
+  // be called with an arbitrary |this| regardless of how insane XBL is), and
+  // because in this method we've entered |this|'s compartment (see in
+  // Field[GS]etter where we attempt a cross-compartment call), we must enter
+  // the callee's compartment to access its reserved slots.
+  nsXBLPrototypeBinding* protoBinding;
+  nsAutoJSString fieldName;
+  {
+    JSAutoCompartment ac(cx, callee);
+
+    JS::Rooted<JSObject*> xblProto(cx);
+    xblProto = &js::GetFunctionNativeReserved(callee, XBLPROTO_SLOT).toObject();
+
+    JS::Rooted<JS::Value> name(cx, js::GetFunctionNativeReserved(callee, FIELD_SLOT));
+    if (!fieldName.init(cx, name.toString())) {
+      return false;
+    }
+
+    MOZ_ALWAYS_TRUE(JS_ValueToId(cx, name, idp));
+
+    // If a separate XBL scope is being used, the callee is not same-compartment
+    // with the xbl prototype, and the object is a cross-compartment wrapper.
+    xblProto = js::UncheckedUnwrap(xblProto);
+    JSAutoCompartment ac2(cx, xblProto);
+    JS::Value slotVal = ::JS_GetReservedSlot(xblProto, 0);
+    protoBinding = static_cast<nsXBLPrototypeBinding*>(slotVal.toPrivate());
+    MOZ_ASSERT(protoBinding);
+  }
+
+  nsXBLProtoImplField* field = protoBinding->FindField(fieldName);
+  MOZ_ASSERT(field);
+
+  nsresult rv = field->InstallField(thisObj, protoBinding->DocURI(), installed);
+  if (NS_SUCCEEDED(rv)) {
+    return true;
+  }
+
+  if (!::JS_IsExceptionPending(cx)) {
+    xpc::Throw(cx, rv);
+  }
+  return false;
+}
+
+bool
+FieldGetterImpl(JSContext *cx, const JS::CallArgs& args)
+{
+  JS::Handle<JS::Value> thisv = args.thisv();
+  MOZ_ASSERT(ValueHasISupportsPrivate(thisv));
+
+  JS::Rooted<JSObject*> thisObj(cx, &thisv.toObject());
+
+  // We should be in the compartment of |this|. If we got here via nativeCall,
+  // |this| is not same-compartment with |callee|, and it's possible via
+  // asymmetric security semantics that |args.calleev()| is actually a security
+  // wrapper. In this case, we know we want to do an unsafe unwrap, and
+  // InstallXBLField knows how to handle cross-compartment pointers.
+  bool installed = false;
+  JS::Rooted<JSObject*> callee(cx, js::UncheckedUnwrap(&args.calleev().toObject()));
+  JS::Rooted<jsid> id(cx);
+  if (!InstallXBLField(cx, callee, thisObj, &id, &installed)) {
+    return false;
+  }
+
+  if (!installed) {
+    args.rval().setUndefined();
+    return true;
+  }
+
+  return JS_GetPropertyById(cx, thisObj, id, args.rval());
+}
+
+static bool
+FieldGetter(JSContext *cx, unsigned argc, JS::Value *vp)
+{
+  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+  return JS::CallNonGenericMethod<ValueHasISupportsPrivate, FieldGetterImpl>
+                                 (cx, args);
+}
+
+bool
+FieldSetterImpl(JSContext *cx, const JS::CallArgs& args)
+{
+  JS::Handle<JS::Value> thisv = args.thisv();
+  MOZ_ASSERT(ValueHasISupportsPrivate(thisv));
+
+  JS::Rooted<JSObject*> thisObj(cx, &thisv.toObject());
+
+  // We should be in the compartment of |this|. If we got here via nativeCall,
+  // |this| is not same-compartment with |callee|, and it's possible via
+  // asymmetric security semantics that |args.calleev()| is actually a security
+  // wrapper. In this case, we know we want to do an unsafe unwrap, and
+  // InstallXBLField knows how to handle cross-compartment pointers.
+  bool installed = false;
+  JS::Rooted<JSObject*> callee(cx, js::UncheckedUnwrap(&args.calleev().toObject()));
+  JS::Rooted<jsid> id(cx);
+  if (!InstallXBLField(cx, callee, thisObj, &id, &installed)) {
+    return false;
+  }
+
+  if (installed) {
+    if (!::JS_SetPropertyById(cx, thisObj, id, args.get(0))) {
+      return false;
+    }
+  }
+  args.rval().setUndefined();
+  return true;
+}
+
+static bool
+FieldSetter(JSContext *cx, unsigned argc, JS::Value *vp)
+{
+  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+  return JS::CallNonGenericMethod<ValueHasISupportsPrivate, FieldSetterImpl>
+                                 (cx, args);
+}
+
+nsresult
+nsXBLProtoImplField::InstallAccessors(JSContext* aCx,
+                                      JS::Handle<JSObject*> aTargetClassObject)
+{
+  MOZ_ASSERT(js::IsObjectInContextCompartment(aTargetClassObject, aCx));
+  JS::Rooted<JSObject*> globalObject(aCx, JS_GetGlobalForObject(aCx, aTargetClassObject));
+  JS::Rooted<JSObject*> scopeObject(aCx, xpc::GetXBLScopeOrGlobal(aCx, globalObject));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+
+  // Don't install it if the field is empty; see also InstallField which also must
+  // implement the not-empty requirement.
+  if (IsEmpty()) {
+    return NS_OK;
+  }
+
+  // Install a getter/setter pair which will resolve the field onto the actual
+  // object, when invoked.
+
+  // Get the field name as an id.
+  JS::Rooted<jsid> id(aCx);
+  JS::TwoByteChars chars(mName, NS_strlen(mName));
+  if (!JS_CharsToId(aCx, chars, &id))
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // Properties/Methods have historically taken precendence over fields. We
+  // install members first, so just bounce here if the property is already
+  // defined.
+  bool found = false;
+  if (!JS_AlreadyHasOwnPropertyById(aCx, aTargetClassObject, id, &found))
+    return NS_ERROR_FAILURE;
+  if (found)
+    return NS_OK;
+
+  // FieldGetter and FieldSetter need to run in the XBL scope so that they can
+  // see through any SOWs on their targets.
+
+  // First, enter the XBL scope, and compile the functions there.
+  JSAutoCompartment ac(aCx, scopeObject);
+  JS::Rooted<JS::Value> wrappedClassObj(aCx, JS::ObjectValue(*aTargetClassObject));
+  if (!JS_WrapValue(aCx, &wrappedClassObj))
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  JS::Rooted<JSObject*> get(aCx,
+    JS_GetFunctionObject(js::NewFunctionByIdWithReserved(aCx, FieldGetter,
+                                                         0, 0, id)));
+  if (!get) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  js::SetFunctionNativeReserved(get, XBLPROTO_SLOT, wrappedClassObj);
+  js::SetFunctionNativeReserved(get, FIELD_SLOT,
+                                JS::StringValue(JSID_TO_STRING(id)));
+
+  JS::Rooted<JSObject*> set(aCx,
+    JS_GetFunctionObject(js::NewFunctionByIdWithReserved(aCx, FieldSetter,
+                                                          1, 0, id)));
+  if (!set) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  js::SetFunctionNativeReserved(set, XBLPROTO_SLOT, wrappedClassObj);
+  js::SetFunctionNativeReserved(set, FIELD_SLOT,
+                                JS::StringValue(JSID_TO_STRING(id)));
+
+  // Now, re-enter the class object's scope, wrap the getters/setters, and define
+  // them there.
+  JSAutoCompartment ac2(aCx, aTargetClassObject);
+  if (!JS_WrapObject(aCx, &get) || !JS_WrapObject(aCx, &set)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  if (!::JS_DefinePropertyById(aCx, aTargetClassObject, id, JS::UndefinedHandleValue,
+                               AccessorAttributes(),
+                               JS_DATA_TO_FUNC_PTR(JSNative, get.get()),
+                               JS_DATA_TO_FUNC_PTR(JSNative, set.get()))) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplField::InstallField(JS::Handle<JSObject*> aBoundNode,
+                                  nsIURI* aBindingDocURI,
+                                  bool* aDidInstall) const
+{
+  NS_PRECONDITION(aBoundNode,
+                  "uh-oh, bound node should NOT be null or bad things will "
+                  "happen");
+
+  *aDidInstall = false;
+
+  // Empty fields are treated as not actually present.
+  if (IsEmpty()) {
+    return NS_OK;
+  }
+
+  nsAutoMicroTask mt;
+
+  nsAutoCString uriSpec;
+  nsresult rv = aBindingDocURI->GetSpec(uriSpec);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsIGlobalObject* globalObject = xpc::WindowGlobalOrNull(aBoundNode);
+  if (!globalObject) {
+    return NS_OK;
+  }
+
+  // We are going to run script via EvaluateString, so we need a script entry
+  // point, but as this is XBL related it does not appear in the HTML spec.
+  // We need an actual JSContext to do GetScopeForXBLExecution, and it needs to
+  // be in the compartment of globalObject.  But we want our XBL execution scope
+  // to be our entry global.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(globalObject)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+  MOZ_ASSERT(!::JS_IsExceptionPending(jsapi.cx()),
+             "Shouldn't get here when an exception is pending!");
+
+  JSAddonId* addonId = MapURIToAddonID(aBindingDocURI);
+
+  // Note: the UNWRAP_OBJECT may mutate boundNode; don't use it after that call.
+  JS::Rooted<JSObject*> boundNode(jsapi.cx(), aBoundNode);
+  Element* boundElement = nullptr;
+  rv = UNWRAP_OBJECT(Element, &boundNode, boundElement);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // First, enter the xbl scope, build the element's scope chain, and use
+  // that as the scope chain for the evaluation.
+  JS::Rooted<JSObject*> scopeObject(jsapi.cx(),
+    xpc::GetScopeForXBLExecution(jsapi.cx(), aBoundNode, addonId));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+
+  AutoEntryScript aes(scopeObject, "XBL <field> initialization", true);
+  JSContext* cx = aes.cx();
+
+  JS::Rooted<JS::Value> result(cx);
+  JS::CompileOptions options(cx);
+  options.setFileAndLine(uriSpec.get(), mLineNumber)
+         .setVersion(JSVERSION_LATEST);
+  nsJSUtils::EvaluateOptions evalOptions(cx);
+  if (!nsJSUtils::GetScopeChainForElement(cx, boundElement,
+                                          evalOptions.scopeChain)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  rv = nsJSUtils::EvaluateString(cx, nsDependentString(mFieldText,
+                                                       mFieldTextLength),
+                                 scopeObject, options, evalOptions, &result);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (rv == NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW) {
+    // Report the exception now, before we try using the JSContext for
+    // the JS_DefineUCProperty call.  Note that this reports in our current
+    // compartment, which is the XBL scope.
+    aes.ReportException();
+  }
+
+  // Now, enter the node's compartment, wrap the eval result, and define it on
+  // the bound node.
+  JSAutoCompartment ac2(cx, aBoundNode);
+  nsDependentString name(mName);
+  if (!JS_WrapValue(cx, &result) ||
+      !::JS_DefineUCProperty(cx, aBoundNode,
+                             reinterpret_cast<const char16_t*>(mName),
+                             name.Length(), result, mJSAttributes)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  *aDidInstall = true;
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplField::Read(nsIObjectInputStream* aStream)
+{
+  nsAutoString name;
+  nsresult rv = aStream->ReadString(name);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mName = ToNewUnicode(name);
+
+  rv = aStream->Read32(&mLineNumber);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString fieldText;
+  rv = aStream->ReadString(fieldText);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mFieldTextLength = fieldText.Length();
+  if (mFieldTextLength)
+    mFieldText = ToNewUnicode(fieldText);
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplField::Write(nsIObjectOutputStream* aStream)
+{
+  XBLBindingSerializeDetails type = XBLBinding_Serialize_Field;
+
+  if (mJSAttributes & JSPROP_READONLY) {
+    type |= XBLBinding_Serialize_ReadOnly;
+  }
+
+  nsresult rv = aStream->Write8(type);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->WriteWStringZ(mName);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Write32(mLineNumber);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return aStream->WriteWStringZ(mFieldText ? mFieldText : u"");
+}
diff --git a/dom/xbl/nsXBLProtoImplField.h b/dom/xbl/nsXBLProtoImplField.h
new file mode 100644
index 0000000000..667f03a61c
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplField.h
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLProtoImplField_h__
+#define nsXBLProtoImplField_h__
+
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "jsapi.h"
+#include "nsString.h"
+#include "nsXBLProtoImplMember.h"
+
+class nsIObjectInputStream;
+class nsIObjectOutputStream;
+class nsIURI;
+
+class nsXBLProtoImplField
+{
+public:
+  nsXBLProtoImplField(const char16_t* aName, const char16_t* aReadOnly);
+  explicit nsXBLProtoImplField(const bool aIsReadOnly);
+  ~nsXBLProtoImplField();
+
+  void AppendFieldText(const nsAString& aText);
+  void SetLineNumber(uint32_t aLineNumber) {
+    mLineNumber = aLineNumber;
+  }
+  
+  nsXBLProtoImplField* GetNext() const { return mNext; }
+  void SetNext(nsXBLProtoImplField* aNext) { mNext = aNext; }
+
+  nsresult InstallField(JS::Handle<JSObject*> aBoundNode,
+                        nsIURI* aBindingDocURI,
+                        bool* aDidInstall) const;
+
+  nsresult InstallAccessors(JSContext* aCx,
+                            JS::Handle<JSObject*> aTargetClassObject);
+
+  nsresult Read(nsIObjectInputStream* aStream);
+  nsresult Write(nsIObjectOutputStream* aStream);
+
+  const char16_t* GetName() const { return mName; }
+
+  unsigned AccessorAttributes() const {
+    return JSPROP_SHARED | JSPROP_GETTER | JSPROP_SETTER |
+           (mJSAttributes & (JSPROP_ENUMERATE | JSPROP_PERMANENT));
+  }
+
+  bool IsEmpty() const { return mFieldTextLength == 0; }
+
+protected:
+  nsXBLProtoImplField* mNext;
+  char16_t* mName;
+  char16_t* mFieldText;
+  uint32_t mFieldTextLength;
+  uint32_t mLineNumber;
+  unsigned mJSAttributes;
+};
+
+#endif // nsXBLProtoImplField_h__
diff --git a/dom/xbl/nsXBLProtoImplMember.h b/dom/xbl/nsXBLProtoImplMember.h
new file mode 100644
index 0000000000..4a2789d934
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplMember.h
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLProtoImplMember_h__
+#define nsXBLProtoImplMember_h__
+
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "nsString.h"
+#include "nsIServiceManager.h"
+#include "nsContentUtils.h" // For NS_CONTENT_DELETE_LIST_MEMBER.
+#include "nsCycleCollectionParticipant.h"
+
+class nsIObjectOutputStream;
+
+struct nsXBLTextWithLineNumber
+{
+  char16_t* mText;
+  uint32_t mLineNumber;
+
+  nsXBLTextWithLineNumber() :
+    mText(nullptr),
+    mLineNumber(0)
+  {
+    MOZ_COUNT_CTOR(nsXBLTextWithLineNumber);
+  }
+
+  ~nsXBLTextWithLineNumber() {
+    MOZ_COUNT_DTOR(nsXBLTextWithLineNumber);
+    if (mText) {
+      free(mText);
+    }
+  }
+
+  void AppendText(const nsAString& aText) {
+    if (mText) {
+      char16_t* temp = mText;
+      mText = ToNewUnicode(nsDependentString(temp) + aText);
+      free(temp);
+    } else {
+      mText = ToNewUnicode(aText);
+    }
+  }
+
+  char16_t* GetText() {
+    return mText;
+  }
+
+  void SetLineNumber(uint32_t aLineNumber) {
+    mLineNumber = aLineNumber;
+  }
+
+  uint32_t GetLineNumber() {
+    return mLineNumber;
+  }
+};
+
+class nsXBLProtoImplMember
+{
+public:
+  explicit nsXBLProtoImplMember(const char16_t* aName)
+    : mNext(nullptr)
+    , mExposeToUntrustedContent(false)
+  {
+    mName = ToNewUnicode(nsDependentString(aName));
+  }
+  virtual ~nsXBLProtoImplMember() {
+    free(mName);
+    NS_CONTENT_DELETE_LIST_MEMBER(nsXBLProtoImplMember, this, mNext);
+  }
+
+  nsXBLProtoImplMember* GetNext() { return mNext; }
+  void SetNext(nsXBLProtoImplMember* aNext) { mNext = aNext; }
+  bool ShouldExposeToUntrustedContent() { return mExposeToUntrustedContent; }
+  void SetExposeToUntrustedContent(bool aExpose) { mExposeToUntrustedContent = aExpose; }
+  const char16_t* GetName() { return mName; }
+
+  virtual nsresult InstallMember(JSContext* aCx,
+                                 JS::Handle<JSObject*> aTargetClassObject) = 0;
+  virtual nsresult CompileMember(mozilla::dom::AutoJSAPI& jsapi, const nsString& aClassStr,
+                                 JS::Handle<JSObject*> aClassObject) = 0;
+
+  virtual void Trace(const TraceCallbacks& aCallbacks, void *aClosure) = 0;
+
+  virtual nsresult Write(nsIObjectOutputStream* aStream)
+  {
+    return NS_OK;
+  }
+
+protected:
+  nsXBLProtoImplMember* mNext;  // The members of an implementation are chained.
+  char16_t* mName;               // The name of the field, method, or property.
+
+  bool mExposeToUntrustedContent; // If this binding is installed on an element
+                                  // in an untrusted scope, should this
+                                  // implementation member be accessible to the
+                                  // content?
+};
+
+#endif // nsXBLProtoImplMember_h__
diff --git a/dom/xbl/nsXBLProtoImplMethod.cpp b/dom/xbl/nsXBLProtoImplMethod.cpp
new file mode 100644
index 0000000000..31b215ab37
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplMethod.cpp
@@ -0,0 +1,356 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "jsapi.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsIGlobalObject.h"
+#include "nsUnicharUtils.h"
+#include "nsReadableUtils.h"
+#include "nsXBLProtoImplMethod.h"
+#include "nsJSUtils.h"
+#include "nsContentUtils.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsIXPConnect.h"
+#include "xpcpublic.h"
+#include "nsXBLPrototypeBinding.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ScriptSettings.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsXBLProtoImplMethod::nsXBLProtoImplMethod(const char16_t* aName) :
+  nsXBLProtoImplMember(aName),
+  mMethod()
+{
+  MOZ_COUNT_CTOR(nsXBLProtoImplMethod);
+}
+
+nsXBLProtoImplMethod::~nsXBLProtoImplMethod()
+{
+  MOZ_COUNT_DTOR(nsXBLProtoImplMethod);
+
+  if (!IsCompiled()) {
+    delete GetUncompiledMethod();
+  }
+}
+
+void
+nsXBLProtoImplMethod::AppendBodyText(const nsAString& aText)
+{
+  NS_PRECONDITION(!IsCompiled(),
+                  "Must not be compiled when accessing uncompiled method");
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+  if (!uncompiledMethod) {
+    uncompiledMethod = new nsXBLUncompiledMethod();
+    SetUncompiledMethod(uncompiledMethod);
+  }
+
+  uncompiledMethod->AppendBodyText(aText);
+}
+
+void
+nsXBLProtoImplMethod::AddParameter(const nsAString& aText)
+{
+  NS_PRECONDITION(!IsCompiled(),
+                  "Must not be compiled when accessing uncompiled method");
+
+  if (aText.IsEmpty()) {
+    NS_WARNING("Empty name attribute in xbl:parameter!");
+    return;
+  }
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+  if (!uncompiledMethod) {
+    uncompiledMethod = new nsXBLUncompiledMethod();
+    SetUncompiledMethod(uncompiledMethod);
+  }
+
+  uncompiledMethod->AddParameter(aText);
+}
+
+void
+nsXBLProtoImplMethod::SetLineNumber(uint32_t aLineNumber)
+{
+  NS_PRECONDITION(!IsCompiled(),
+                  "Must not be compiled when accessing uncompiled method");
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+  if (!uncompiledMethod) {
+    uncompiledMethod = new nsXBLUncompiledMethod();
+    SetUncompiledMethod(uncompiledMethod);
+  }
+
+  uncompiledMethod->SetLineNumber(aLineNumber);
+}
+
+nsresult
+nsXBLProtoImplMethod::InstallMember(JSContext* aCx,
+                                    JS::Handle<JSObject*> aTargetClassObject)
+{
+  NS_PRECONDITION(IsCompiled(),
+                  "Should not be installing an uncompiled method");
+  MOZ_ASSERT(js::IsObjectInContextCompartment(aTargetClassObject, aCx));
+
+#ifdef DEBUG
+  {
+    JS::Rooted<JSObject*> globalObject(aCx, JS_GetGlobalForObject(aCx, aTargetClassObject));
+    MOZ_ASSERT(xpc::IsInContentXBLScope(globalObject) ||
+               xpc::IsInAddonScope(globalObject) ||
+               globalObject == xpc::GetXBLScope(aCx, globalObject));
+    MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == globalObject);
+  }
+#endif
+
+  JS::Rooted<JSObject*> jsMethodObject(aCx, GetCompiledMethod());
+  if (jsMethodObject) {
+    nsDependentString name(mName);
+
+    JS::Rooted<JSObject*> method(aCx, JS::CloneFunctionObject(aCx, jsMethodObject));
+    NS_ENSURE_TRUE(method, NS_ERROR_OUT_OF_MEMORY);
+
+    if (!::JS_DefineUCProperty(aCx, aTargetClassObject,
+                               static_cast<const char16_t*>(mName),
+                               name.Length(), method,
+                               JSPROP_ENUMERATE)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplMethod::CompileMember(AutoJSAPI& jsapi, const nsString& aClassStr,
+                                    JS::Handle<JSObject*> aClassObject)
+{
+  AssertInCompilationScope();
+  NS_PRECONDITION(!IsCompiled(),
+                  "Trying to compile an already-compiled method");
+  NS_PRECONDITION(aClassObject,
+                  "Must have class object to compile");
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+
+  // No parameters or body was supplied, so don't install method.
+  if (!uncompiledMethod) {
+    // Early return after which we consider ourselves compiled.
+    SetCompiledMethod(nullptr);
+
+    return NS_OK;
+  }
+
+  // Don't install method if no name was supplied.
+  if (!mName) {
+    delete uncompiledMethod;
+
+    // Early return after which we consider ourselves compiled.
+    SetCompiledMethod(nullptr);
+
+    return NS_OK;
+  }
+
+  // We have a method.
+  // Allocate an array for our arguments.
+  int32_t paramCount = uncompiledMethod->GetParameterCount();
+  char** args = nullptr;
+  if (paramCount > 0) {
+    args = new char*[paramCount];
+
+    // Add our parameters to our args array.
+    int32_t argPos = 0;
+    for (nsXBLParameter* curr = uncompiledMethod->mParameters;
+         curr;
+         curr = curr->mNext) {
+      args[argPos] = curr->mName;
+      argPos++;
+    }
+  }
+
+  // Get the body
+  nsDependentString body;
+  char16_t *bodyText = uncompiledMethod->mBodyText.GetText();
+  if (bodyText)
+    body.Rebind(bodyText);
+
+  // Now that we have a body and args, compile the function
+  // and then define it.
+  NS_ConvertUTF16toUTF8 cname(mName);
+  NS_ConvertUTF16toUTF8 functionUri(aClassStr);
+  int32_t hash = functionUri.RFindChar('#');
+  if (hash != kNotFound) {
+    functionUri.Truncate(hash);
+  }
+
+  JSContext *cx = jsapi.cx();
+  JSAutoCompartment ac(cx, aClassObject);
+  JS::CompileOptions options(cx);
+  options.setFileAndLine(functionUri.get(),
+                         uncompiledMethod->mBodyText.GetLineNumber())
+         .setVersion(JSVERSION_LATEST);
+  JS::Rooted<JSObject*> methodObject(cx);
+  JS::AutoObjectVector emptyVector(cx);
+  nsresult rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, cname,
+                                           paramCount,
+                                           const_cast<const char**>(args),
+                                           body, methodObject.address());
+
+  // Destroy our uncompiled method and delete our arg list.
+  delete uncompiledMethod;
+  delete [] args;
+  if (NS_FAILED(rv)) {
+    SetUncompiledMethod(nullptr);
+    return rv;
+  }
+
+  SetCompiledMethod(methodObject);
+
+  return NS_OK;
+}
+
+void
+nsXBLProtoImplMethod::Trace(const TraceCallbacks& aCallbacks, void *aClosure)
+{
+  if (IsCompiled() && GetCompiledMethodPreserveColor()) {
+    aCallbacks.Trace(&mMethod.AsHeapObject(), "mMethod", aClosure);
+  }
+}
+
+nsresult
+nsXBLProtoImplMethod::Read(nsIObjectInputStream* aStream)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(!IsCompiled() && !GetUncompiledMethod());
+
+  AutoJSContext cx;
+  JS::Rooted<JSObject*> methodObject(cx);
+  nsresult rv = XBL_DeserializeFunction(aStream, &methodObject);
+  if (NS_FAILED(rv)) {
+    SetUncompiledMethod(nullptr);
+    return rv;
+  }
+
+  SetCompiledMethod(methodObject);
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplMethod::Write(nsIObjectOutputStream* aStream)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(IsCompiled());
+  if (GetCompiledMethodPreserveColor()) {
+    nsresult rv = aStream->Write8(XBLBinding_Serialize_Method);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aStream->WriteWStringZ(mName);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    JS::Rooted<JSObject*> method(RootingCx(), GetCompiledMethod());
+    return XBL_SerializeFunction(aStream, method);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplAnonymousMethod::Execute(nsIContent* aBoundElement, JSAddonId* aAddonId)
+{
+  MOZ_ASSERT(aBoundElement->IsElement());
+  NS_PRECONDITION(IsCompiled(), "Can't execute uncompiled method");
+
+  if (!GetCompiledMethod()) {
+    // Nothing to do here
+    return NS_OK;
+  }
+
+  // Get the script context the same way
+  // nsXBLProtoImpl::InstallImplementation does.
+  nsIDocument* document = aBoundElement->OwnerDoc();
+
+  nsCOMPtr<nsIGlobalObject> global =
+    do_QueryInterface(document->GetInnerWindow());
+  if (!global) {
+    return NS_OK;
+  }
+
+  nsAutoMicroTask mt;
+
+  // We are going to run script via JS::Call, so we need a script entry point,
+  // but as this is XBL related it does not appear in the HTML spec.
+  // We need an actual JSContext to do GetScopeForXBLExecution, and it needs to
+  // be in the compartment of globalObject.  But we want our XBL execution scope
+  // to be our entry global.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(global)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  JS::Rooted<JSObject*> globalObject(jsapi.cx(), global->GetGlobalJSObject());
+
+  JS::Rooted<JSObject*> scopeObject(jsapi.cx(),
+    xpc::GetScopeForXBLExecution(jsapi.cx(), globalObject, aAddonId));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+
+  dom::AutoEntryScript aes(scopeObject,
+                           "XBL <constructor>/<destructor> invocation",
+                           true);
+  JSContext* cx = aes.cx();
+  JS::AutoObjectVector scopeChain(cx);
+  if (!nsJSUtils::GetScopeChainForElement(cx, aBoundElement->AsElement(),
+                                          scopeChain)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  MOZ_ASSERT(scopeChain.length() != 0);
+
+  // Clone the function object, using our scope chain (for backwards
+  // compat to the days when this was an event handler).
+  JS::Rooted<JSObject*> jsMethodObject(cx, GetCompiledMethod());
+  JS::Rooted<JSObject*> method(cx, JS::CloneFunctionObject(cx, jsMethodObject,
+                                                           scopeChain));
+  if (!method)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // Now call the method
+
+  // Check whether script is enabled.
+  bool scriptAllowed = xpc::Scriptability::Get(method).Allowed();
+
+  if (scriptAllowed) {
+    JS::Rooted<JS::Value> retval(cx);
+    JS::Rooted<JS::Value> methodVal(cx, JS::ObjectValue(*method));
+    // No need to check the return here as AutoEntryScript has taken ownership
+    // of error reporting.
+    ::JS::Call(cx, scopeChain[0], methodVal, JS::HandleValueArray::empty(), &retval);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplAnonymousMethod::Write(nsIObjectOutputStream* aStream,
+                                     XBLBindingSerializeDetails aType)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(IsCompiled());
+  if (GetCompiledMethodPreserveColor()) {
+    nsresult rv = aStream->Write8(aType);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aStream->WriteWStringZ(mName);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    JS::Rooted<JSObject*> method(RootingCx(), GetCompiledMethod());
+    rv = XBL_SerializeFunction(aStream, method);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
diff --git a/dom/xbl/nsXBLProtoImplMethod.h b/dom/xbl/nsXBLProtoImplMethod.h
new file mode 100644
index 0000000000..8a616e11e1
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplMethod.h
@@ -0,0 +1,156 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLProtoImplMethod_h__
+#define nsXBLProtoImplMethod_h__
+
+#include "mozilla/Attributes.h"
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "nsString.h"
+#include "nsXBLMaybeCompiled.h"
+#include "nsXBLProtoImplMember.h"
+#include "nsXBLSerialize.h"
+
+class nsIContent;
+
+struct nsXBLParameter {
+  nsXBLParameter* mNext;
+  char* mName;
+
+  explicit nsXBLParameter(const nsAString& aName) {
+    MOZ_COUNT_CTOR(nsXBLParameter);
+    mName = ToNewCString(aName);
+    mNext = nullptr;
+  }
+
+  ~nsXBLParameter() {
+    MOZ_COUNT_DTOR(nsXBLParameter);
+    free(mName);
+    NS_CONTENT_DELETE_LIST_MEMBER(nsXBLParameter, this, mNext);
+  }
+};
+
+struct nsXBLUncompiledMethod {
+  nsXBLParameter* mParameters;
+  nsXBLParameter* mLastParameter;
+  nsXBLTextWithLineNumber mBodyText;
+
+  nsXBLUncompiledMethod() :
+    mParameters(nullptr),
+    mLastParameter(nullptr),
+    mBodyText()
+  {
+    MOZ_COUNT_CTOR(nsXBLUncompiledMethod);
+  }
+
+  ~nsXBLUncompiledMethod() {
+    MOZ_COUNT_DTOR(nsXBLUncompiledMethod);
+    delete mParameters;
+  }
+
+  int32_t GetParameterCount() {
+    int32_t result = 0;
+    for (nsXBLParameter* curr = mParameters; curr; curr=curr->mNext)
+      result++;
+    return result;
+  }
+
+  void AppendBodyText(const nsAString& aText) {
+    mBodyText.AppendText(aText);
+  }
+
+  void AddParameter(const nsAString& aText) {
+    nsXBLParameter* param = new nsXBLParameter(aText);
+    if (!mParameters)
+      mParameters = param;
+    else
+      mLastParameter->mNext = param;
+    mLastParameter = param;
+  }
+
+  void SetLineNumber(uint32_t aLineNumber) {
+    mBodyText.SetLineNumber(aLineNumber);
+  }
+};
+
+class nsXBLProtoImplMethod: public nsXBLProtoImplMember
+{
+public:
+  explicit nsXBLProtoImplMethod(const char16_t* aName);
+  virtual ~nsXBLProtoImplMethod();
+
+  void AppendBodyText(const nsAString& aBody);
+  void AddParameter(const nsAString& aName);
+
+  void SetLineNumber(uint32_t aLineNumber);
+
+  virtual nsresult InstallMember(JSContext* aCx,
+                                 JS::Handle<JSObject*> aTargetClassObject) override;
+  virtual nsresult CompileMember(mozilla::dom::AutoJSAPI& jsapi, const nsString& aClassStr,
+                                 JS::Handle<JSObject*> aClassObject) override;
+
+  virtual void Trace(const TraceCallbacks& aCallbacks, void *aClosure) override;
+
+  nsresult Read(nsIObjectInputStream* aStream);
+  virtual nsresult Write(nsIObjectOutputStream* aStream) override;
+
+  bool IsCompiled() const
+  {
+    return mMethod.IsCompiled();
+  }
+
+  void SetUncompiledMethod(nsXBLUncompiledMethod* aUncompiledMethod)
+  {
+    mMethod.SetUncompiled(aUncompiledMethod);
+  }
+
+  nsXBLUncompiledMethod* GetUncompiledMethod() const
+  {
+    return mMethod.GetUncompiled();
+  }
+
+protected:
+  void SetCompiledMethod(JSObject* aCompiledMethod)
+  {
+    mMethod.SetJSFunction(aCompiledMethod);
+  }
+
+  JSObject* GetCompiledMethod() const
+  {
+    return mMethod.GetJSFunction();
+  }
+
+  JSObject* GetCompiledMethodPreserveColor() const
+  {
+    return mMethod.GetJSFunctionPreserveColor();
+  }
+
+  JS::Heap<nsXBLMaybeCompiled<nsXBLUncompiledMethod> > mMethod;
+};
+
+class nsXBLProtoImplAnonymousMethod : public nsXBLProtoImplMethod {
+public:
+  explicit nsXBLProtoImplAnonymousMethod(const char16_t* aName) :
+    nsXBLProtoImplMethod(aName)
+  {}
+
+  nsresult Execute(nsIContent* aBoundElement, JSAddonId* aAddonId);
+
+  // Override InstallMember; these methods never get installed as members on
+  // binding instantiations (though they may hang out in mMembers on the
+  // prototype implementation).
+  virtual nsresult InstallMember(JSContext* aCx,
+                                 JS::Handle<JSObject*> aTargetClassObject) override {
+    return NS_OK;
+  }
+
+  using nsXBLProtoImplMethod::Write;
+  nsresult Write(nsIObjectOutputStream* aStream,
+                 XBLBindingSerializeDetails aType);
+};
+
+#endif // nsXBLProtoImplMethod_h__
diff --git a/dom/xbl/nsXBLProtoImplProperty.cpp b/dom/xbl/nsXBLProtoImplProperty.cpp
new file mode 100644
index 0000000000..557a836da3
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplProperty.cpp
@@ -0,0 +1,370 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "jsapi.h"
+#include "nsIContent.h"
+#include "nsXBLProtoImplProperty.h"
+#include "nsUnicharUtils.h"
+#include "nsReadableUtils.h"
+#include "nsJSUtils.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsXBLSerialize.h"
+#include "xpcpublic.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsXBLProtoImplProperty::nsXBLProtoImplProperty(const char16_t* aName,
+                                               const char16_t* aGetter,
+                                               const char16_t* aSetter,
+                                               const char16_t* aReadOnly,
+                                               uint32_t aLineNumber) :
+  nsXBLProtoImplMember(aName),
+  mJSAttributes(JSPROP_ENUMERATE)
+#ifdef DEBUG
+  , mIsCompiled(false)
+#endif
+{
+  MOZ_COUNT_CTOR(nsXBLProtoImplProperty);
+
+  if (aReadOnly) {
+    nsAutoString readOnly; readOnly.Assign(*aReadOnly);
+    if (readOnly.LowerCaseEqualsLiteral("true"))
+      mJSAttributes |= JSPROP_READONLY;
+  }
+
+  if (aGetter) {
+    AppendGetterText(nsDependentString(aGetter));
+    SetGetterLineNumber(aLineNumber);
+  }
+  if (aSetter) {
+    AppendSetterText(nsDependentString(aSetter));
+    SetSetterLineNumber(aLineNumber);
+  }
+}
+
+nsXBLProtoImplProperty::nsXBLProtoImplProperty(const char16_t* aName,
+                                               const bool aIsReadOnly)
+  : nsXBLProtoImplMember(aName),
+    mJSAttributes(JSPROP_ENUMERATE)
+#ifdef DEBUG
+  , mIsCompiled(false)
+#endif
+{
+  MOZ_COUNT_CTOR(nsXBLProtoImplProperty);
+
+  if (aIsReadOnly)
+    mJSAttributes |= JSPROP_READONLY;
+}
+
+nsXBLProtoImplProperty::~nsXBLProtoImplProperty()
+{
+  MOZ_COUNT_DTOR(nsXBLProtoImplProperty);
+
+  if (!mGetter.IsCompiled()) {
+    delete mGetter.GetUncompiled();
+  }
+
+  if (!mSetter.IsCompiled()) {
+    delete mSetter.GetUncompiled();
+  }
+}
+
+void nsXBLProtoImplProperty::EnsureUncompiledText(PropertyOp& aPropertyOp)
+{
+  if (!aPropertyOp.GetUncompiled()) {
+    nsXBLTextWithLineNumber* text = new nsXBLTextWithLineNumber();
+    aPropertyOp.SetUncompiled(text);
+  }
+}
+
+void 
+nsXBLProtoImplProperty::AppendGetterText(const nsAString& aText)
+{
+  NS_PRECONDITION(!mIsCompiled,
+                  "Must not be compiled when accessing getter text");
+  EnsureUncompiledText(mGetter);
+  mGetter.GetUncompiled()->AppendText(aText);
+}
+
+void 
+nsXBLProtoImplProperty::AppendSetterText(const nsAString& aText)
+{
+  NS_PRECONDITION(!mIsCompiled,
+                  "Must not be compiled when accessing setter text");
+  EnsureUncompiledText(mSetter);
+  mSetter.GetUncompiled()->AppendText(aText);
+}
+
+void
+nsXBLProtoImplProperty::SetGetterLineNumber(uint32_t aLineNumber)
+{
+  NS_PRECONDITION(!mIsCompiled,
+                  "Must not be compiled when accessing getter text");
+  EnsureUncompiledText(mGetter);
+  mGetter.GetUncompiled()->SetLineNumber(aLineNumber);
+}
+
+void
+nsXBLProtoImplProperty::SetSetterLineNumber(uint32_t aLineNumber)
+{
+  NS_PRECONDITION(!mIsCompiled,
+                  "Must not be compiled when accessing setter text");
+  EnsureUncompiledText(mSetter);
+  mSetter.GetUncompiled()->SetLineNumber(aLineNumber);
+}
+
+const char* gPropertyArgs[] = { "val" };
+
+nsresult
+nsXBLProtoImplProperty::InstallMember(JSContext *aCx,
+                                      JS::Handle<JSObject*> aTargetClassObject)
+{
+  NS_PRECONDITION(mIsCompiled,
+                  "Should not be installing an uncompiled property");
+  MOZ_ASSERT(mGetter.IsCompiled() && mSetter.IsCompiled());
+  MOZ_ASSERT(js::IsObjectInContextCompartment(aTargetClassObject, aCx));
+
+#ifdef DEBUG
+  {
+    JS::Rooted<JSObject*> globalObject(aCx, JS_GetGlobalForObject(aCx, aTargetClassObject));
+    MOZ_ASSERT(xpc::IsInContentXBLScope(globalObject) ||
+               xpc::IsInAddonScope(globalObject) ||
+               globalObject == xpc::GetXBLScope(aCx, globalObject));
+    MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == globalObject);
+  }
+#endif
+
+  JS::Rooted<JSObject*> getter(aCx, mGetter.GetJSFunction());
+  JS::Rooted<JSObject*> setter(aCx, mSetter.GetJSFunction());
+  if (getter || setter) {
+    if (getter) {
+      if (!(getter = JS::CloneFunctionObject(aCx, getter)))
+        return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    if (setter) {
+      if (!(setter = JS::CloneFunctionObject(aCx, setter)))
+        return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    nsDependentString name(mName);
+    if (!::JS_DefineUCProperty(aCx, aTargetClassObject,
+                               static_cast<const char16_t*>(mName),
+                               name.Length(), JS::UndefinedHandleValue, mJSAttributes,
+                               JS_DATA_TO_FUNC_PTR(JSNative, getter.get()),
+                               JS_DATA_TO_FUNC_PTR(JSNative, setter.get())))
+      return NS_ERROR_OUT_OF_MEMORY;
+  }
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplProperty::CompileMember(AutoJSAPI& jsapi, const nsString& aClassStr,
+                                      JS::Handle<JSObject*> aClassObject)
+{
+  AssertInCompilationScope();
+  NS_PRECONDITION(!mIsCompiled,
+                  "Trying to compile an already-compiled property");
+  NS_PRECONDITION(aClassObject,
+                  "Must have class object to compile");
+  MOZ_ASSERT(!mGetter.IsCompiled() && !mSetter.IsCompiled());
+  JSContext *cx = jsapi.cx();
+
+  if (!mName)
+    return NS_ERROR_FAILURE; // Without a valid name, we can't install the member.
+
+  // We have a property.
+  nsresult rv = NS_OK;
+
+  nsAutoCString functionUri;
+  if (mGetter.GetUncompiled() || mSetter.GetUncompiled()) {
+    functionUri = NS_ConvertUTF16toUTF8(aClassStr);
+    int32_t hash = functionUri.RFindChar('#');
+    if (hash != kNotFound) {
+      functionUri.Truncate(hash);
+    }
+  }
+
+  bool deletedGetter = false;
+  nsXBLTextWithLineNumber *getterText = mGetter.GetUncompiled();
+  if (getterText && getterText->GetText()) {
+    nsDependentString getter(getterText->GetText());
+    if (!getter.IsEmpty()) {
+      JSAutoCompartment ac(cx, aClassObject);
+      JS::CompileOptions options(cx);
+      options.setFileAndLine(functionUri.get(), getterText->GetLineNumber())
+             .setVersion(JSVERSION_LATEST);
+      nsCString name = NS_LITERAL_CSTRING("get_") + NS_ConvertUTF16toUTF8(mName);
+      JS::Rooted<JSObject*> getterObject(cx);
+      JS::AutoObjectVector emptyVector(cx);
+      rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, name, 0,
+                                      nullptr, getter, getterObject.address());
+
+      delete getterText;
+      deletedGetter = true;
+
+      mGetter.SetJSFunction(getterObject);
+    
+      if (mGetter.GetJSFunction() && NS_SUCCEEDED(rv)) {
+        mJSAttributes |= JSPROP_GETTER | JSPROP_SHARED;
+      }
+      if (NS_FAILED(rv)) {
+        mGetter.SetJSFunction(nullptr);
+        mJSAttributes &= ~JSPROP_GETTER;
+        /*chaining to return failure*/
+      }
+    }
+  } // if getter is not empty
+
+  if (!deletedGetter) {  // Empty getter
+    delete getterText;
+    mGetter.SetJSFunction(nullptr);
+  }
+  
+  if (NS_FAILED(rv)) {
+    // We failed to compile our getter.  So either we've set it to null, or
+    // it's still set to the text object.  In either case, it's safe to return
+    // the error here, since then we'll be cleaned up as uncompiled and that
+    // will be ok.  Going on and compiling the setter and _then_ returning an
+    // error, on the other hand, will try to clean up a compiled setter as
+    // uncompiled and crash.
+    return rv;
+  }
+
+  bool deletedSetter = false;
+  nsXBLTextWithLineNumber *setterText = mSetter.GetUncompiled();
+  if (setterText && setterText->GetText()) {
+    nsDependentString setter(setterText->GetText());
+    if (!setter.IsEmpty()) {
+      JSAutoCompartment ac(cx, aClassObject);
+      JS::CompileOptions options(cx);
+      options.setFileAndLine(functionUri.get(), setterText->GetLineNumber())
+             .setVersion(JSVERSION_LATEST);
+      nsCString name = NS_LITERAL_CSTRING("set_") + NS_ConvertUTF16toUTF8(mName);
+      JS::Rooted<JSObject*> setterObject(cx);
+      JS::AutoObjectVector emptyVector(cx);
+      rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, name, 1,
+                                      gPropertyArgs, setter,
+                                      setterObject.address());
+
+      delete setterText;
+      deletedSetter = true;
+      mSetter.SetJSFunction(setterObject);
+
+      if (mSetter.GetJSFunction() && NS_SUCCEEDED(rv)) {
+        mJSAttributes |= JSPROP_SETTER | JSPROP_SHARED;
+      }
+      if (NS_FAILED(rv)) {
+        mSetter.SetJSFunction(nullptr);
+        mJSAttributes &= ~JSPROP_SETTER;
+        /*chaining to return failure*/
+      }
+    }
+  } // if setter wasn't empty....
+
+  if (!deletedSetter) {  // Empty setter
+    delete setterText;
+    mSetter.SetJSFunction(nullptr);
+  }
+
+#ifdef DEBUG
+  mIsCompiled = NS_SUCCEEDED(rv);
+#endif
+
+  return rv;
+}
+
+void
+nsXBLProtoImplProperty::Trace(const TraceCallbacks& aCallbacks, void *aClosure)
+{
+  if (mJSAttributes & JSPROP_GETTER) {
+    aCallbacks.Trace(&mGetter.AsHeapObject(), "mGetter", aClosure);
+  }
+
+  if (mJSAttributes & JSPROP_SETTER) {
+    aCallbacks.Trace(&mSetter.AsHeapObject(), "mSetter", aClosure);
+  }
+}
+
+nsresult
+nsXBLProtoImplProperty::Read(nsIObjectInputStream* aStream,
+                             XBLBindingSerializeDetails aType)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(!mIsCompiled);
+  MOZ_ASSERT(!mGetter.GetUncompiled() && !mSetter.GetUncompiled());
+
+  AutoJSContext cx;
+  JS::Rooted<JSObject*> getterObject(cx);
+  if (aType == XBLBinding_Serialize_GetterProperty ||
+      aType == XBLBinding_Serialize_GetterSetterProperty) {
+    nsresult rv = XBL_DeserializeFunction(aStream, &getterObject);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mJSAttributes |= JSPROP_GETTER | JSPROP_SHARED;
+  }
+  mGetter.SetJSFunction(getterObject);
+
+  JS::Rooted<JSObject*> setterObject(cx);
+  if (aType == XBLBinding_Serialize_SetterProperty ||
+      aType == XBLBinding_Serialize_GetterSetterProperty) {
+    nsresult rv = XBL_DeserializeFunction(aStream, &setterObject);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mJSAttributes |= JSPROP_SETTER | JSPROP_SHARED;
+  }
+  mSetter.SetJSFunction(setterObject);
+
+#ifdef DEBUG
+  mIsCompiled = true;
+#endif
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplProperty::Write(nsIObjectOutputStream* aStream)
+{
+  AssertInCompilationScope();
+  XBLBindingSerializeDetails type;
+
+  if (mJSAttributes & JSPROP_GETTER) {
+    type = mJSAttributes & JSPROP_SETTER ?
+           XBLBinding_Serialize_GetterSetterProperty :
+           XBLBinding_Serialize_GetterProperty;
+  }
+  else {
+    type = XBLBinding_Serialize_SetterProperty;
+  }
+
+  if (mJSAttributes & JSPROP_READONLY) {
+    type |= XBLBinding_Serialize_ReadOnly;
+  }
+
+  nsresult rv = aStream->Write8(type);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->WriteWStringZ(mName);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  MOZ_ASSERT_IF(mJSAttributes & (JSPROP_GETTER | JSPROP_SETTER), mIsCompiled);
+
+  if (mJSAttributes & JSPROP_GETTER) {
+    JS::Rooted<JSObject*> function(RootingCx(), mGetter.GetJSFunction());
+    rv = XBL_SerializeFunction(aStream, function);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  if (mJSAttributes & JSPROP_SETTER) {
+    JS::Rooted<JSObject*> function(RootingCx(), mSetter.GetJSFunction());
+    rv = XBL_SerializeFunction(aStream, function);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
diff --git a/dom/xbl/nsXBLProtoImplProperty.h b/dom/xbl/nsXBLProtoImplProperty.h
new file mode 100644
index 0000000000..cf203294f1
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplProperty.h
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLProtoImplProperty_h__
+#define nsXBLProtoImplProperty_h__
+
+#include "mozilla/Attributes.h"
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "nsString.h"
+#include "nsXBLSerialize.h"
+#include "nsXBLMaybeCompiled.h"
+#include "nsXBLProtoImplMember.h"
+
+class nsXBLProtoImplProperty: public nsXBLProtoImplMember
+{
+public:
+  nsXBLProtoImplProperty(const char16_t* aName,
+                         const char16_t* aGetter, 
+                         const char16_t* aSetter,
+                         const char16_t* aReadOnly,
+                         uint32_t aLineNumber);
+
+  nsXBLProtoImplProperty(const char16_t* aName, const bool aIsReadOnly);
+ 
+  virtual ~nsXBLProtoImplProperty();
+
+  void AppendGetterText(const nsAString& aGetter);
+  void AppendSetterText(const nsAString& aSetter);
+
+  void SetGetterLineNumber(uint32_t aLineNumber);
+  void SetSetterLineNumber(uint32_t aLineNumber);
+
+  virtual nsresult InstallMember(JSContext* aCx,
+                                 JS::Handle<JSObject*> aTargetClassObject) override;
+  virtual nsresult CompileMember(mozilla::dom::AutoJSAPI& jsapi, const nsString& aClassStr,
+                                 JS::Handle<JSObject*> aClassObject) override;
+
+  virtual void Trace(const TraceCallbacks& aCallback, void *aClosure) override;
+
+  nsresult Read(nsIObjectInputStream* aStream,
+                XBLBindingSerializeDetails aType);
+  virtual nsresult Write(nsIObjectOutputStream* aStream) override;
+
+protected:
+  typedef JS::Heap<nsXBLMaybeCompiled<nsXBLTextWithLineNumber> > PropertyOp;
+
+  void EnsureUncompiledText(PropertyOp& aPropertyOp);
+
+  // The raw text for the getter, or the JS object (after compilation).
+  PropertyOp mGetter;
+
+  // The raw text for the setter, or the JS object (after compilation).
+  PropertyOp mSetter;
+  
+  unsigned mJSAttributes;  // A flag for all our JS properties (getter/setter/readonly/shared/enum)
+
+#ifdef DEBUG
+  bool mIsCompiled;
+#endif
+};
+
+#endif // nsXBLProtoImplProperty_h__
diff --git a/dom/xbl/nsXBLPrototypeBinding.cpp b/dom/xbl/nsXBLPrototypeBinding.cpp
new file mode 100644
index 0000000000..c470d887b1
--- /dev/null
+++ b/dom/xbl/nsXBLPrototypeBinding.cpp
@@ -0,0 +1,1696 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsCOMPtr.h"
+#include "nsIAtom.h"
+#include "nsIInputStream.h"
+#include "nsNameSpaceManager.h"
+#include "nsIURI.h"
+#include "nsIURL.h"
+#include "nsIChannel.h"
+#include "nsXPIDLString.h"
+#include "nsReadableUtils.h"
+#include "nsNetUtil.h"
+#include "plstr.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsIDocument.h"
+#include "nsIXMLContentSink.h"
+#include "nsContentCID.h"
+#include "mozilla/dom/XMLDocument.h"
+#include "nsXBLService.h"
+#include "nsXBLBinding.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsXBLContentSink.h"
+#include "xptinfo.h"
+#include "nsIInterfaceInfoManager.h"
+#include "nsIDocumentObserver.h"
+#include "nsGkAtoms.h"
+#include "nsXBLProtoImpl.h"
+#include "nsCRT.h"
+#include "nsContentUtils.h"
+#include "nsTextFragment.h"
+#include "nsTextNode.h"
+#include "nsIInterfaceInfo.h"
+#include "nsIScriptError.h"
+
+#include "nsCSSRuleProcessor.h"
+#include "nsXBLResourceLoader.h"
+#include "mozilla/AddonPathService.h"
+#include "mozilla/dom/CDATASection.h"
+#include "mozilla/dom/Comment.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+
+#ifdef MOZ_XUL
+#include "nsXULElement.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+// Helper Classes =====================================================================
+
+// nsXBLAttributeEntry and helpers.  This class is used to efficiently handle
+// attribute changes in anonymous content.
+
+class nsXBLAttributeEntry {
+public:
+  nsXBLAttributeEntry(nsIAtom* aSrcAtom, nsIAtom* aDstAtom,
+                      int32_t aDstNameSpace, nsIContent* aContent)
+    : mElement(aContent),
+      mSrcAttribute(aSrcAtom),
+      mDstAttribute(aDstAtom),
+      mDstNameSpace(aDstNameSpace),
+      mNext(nullptr) { }
+
+  ~nsXBLAttributeEntry() {
+    NS_CONTENT_DELETE_LIST_MEMBER(nsXBLAttributeEntry, this, mNext);
+  }
+
+  nsIAtom* GetSrcAttribute() { return mSrcAttribute; }
+  nsIAtom* GetDstAttribute() { return mDstAttribute; }
+  int32_t GetDstNameSpace() { return mDstNameSpace; }
+
+  nsIContent* GetElement() { return mElement; }
+
+  nsXBLAttributeEntry* GetNext() { return mNext; }
+  void SetNext(nsXBLAttributeEntry* aEntry) { mNext = aEntry; }
+
+protected:
+  nsIContent* mElement;
+
+  nsCOMPtr<nsIAtom> mSrcAttribute;
+  nsCOMPtr<nsIAtom> mDstAttribute;
+  int32_t mDstNameSpace;
+  nsXBLAttributeEntry* mNext;
+};
+
+// =============================================================================
+
+// Implementation /////////////////////////////////////////////////////////////////
+
+// Constructors/Destructors
+nsXBLPrototypeBinding::nsXBLPrototypeBinding()
+: mImplementation(nullptr),
+  mBaseBinding(nullptr),
+  mInheritStyle(true),
+  mCheckedBaseProto(false),
+  mKeyHandlersRegistered(false),
+  mChromeOnlyContent(false),
+  mBindToUntrustedContent(false),
+  mResources(nullptr),
+  mBaseNameSpaceID(kNameSpaceID_None)
+{
+  MOZ_COUNT_CTOR(nsXBLPrototypeBinding);
+}
+
+nsresult
+nsXBLPrototypeBinding::Init(const nsACString& aID,
+                            nsXBLDocumentInfo* aInfo,
+                            nsIContent* aElement,
+                            bool aFirstBinding)
+{
+  nsresult rv = aInfo->DocumentURI()->Clone(getter_AddRefs(mBindingURI));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // The binding URI might be an immutable URI (e.g. for about: URIs). In that case,
+  // we'll fail in SetRef below, but that doesn't matter much for now.
+  if (aFirstBinding) {
+    rv = mBindingURI->Clone(getter_AddRefs(mAlternateBindingURI));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  mBindingURI->SetRef(aID);
+
+  mXBLDocInfoWeak = aInfo;
+
+  // aElement will be null when reading from the cache, but the element will
+  // still be set later.
+  if (aElement) {
+    SetBindingElement(aElement);
+  }
+  return NS_OK;
+}
+
+bool nsXBLPrototypeBinding::CompareBindingURI(nsIURI* aURI) const
+{
+  bool equal = false;
+  mBindingURI->Equals(aURI, &equal);
+  if (!equal && mAlternateBindingURI) {
+    mAlternateBindingURI->Equals(aURI, &equal);
+  }
+  return equal;
+}
+
+void
+nsXBLPrototypeBinding::Traverse(nsCycleCollectionTraversalCallback &cb) const
+{
+  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "proto mBinding");
+  cb.NoteXPCOMChild(mBinding);
+  if (mResources) {
+    mResources->Traverse(cb);
+  }
+  ImplCycleCollectionTraverse(cb, mInterfaceTable, "proto mInterfaceTable");
+}
+
+void
+nsXBLPrototypeBinding::Unlink()
+{
+  if (mImplementation) {
+    mImplementation->UnlinkJSObjects();
+  }
+
+  if (mResources) {
+    mResources->Unlink();
+  }
+}
+
+void
+nsXBLPrototypeBinding::Trace(const TraceCallbacks& aCallbacks, void *aClosure) const
+{
+  if (mImplementation)
+    mImplementation->Trace(aCallbacks, aClosure);
+}
+
+void
+nsXBLPrototypeBinding::Initialize()
+{
+  nsIContent* content = GetImmediateChild(nsGkAtoms::content);
+  if (content) {
+    ConstructAttributeTable(content);
+  }
+}
+
+nsXBLPrototypeBinding::~nsXBLPrototypeBinding(void)
+{
+  delete mImplementation;
+  MOZ_COUNT_DTOR(nsXBLPrototypeBinding);
+}
+
+void
+nsXBLPrototypeBinding::SetBasePrototype(nsXBLPrototypeBinding* aBinding)
+{
+  if (mBaseBinding == aBinding)
+    return;
+
+  if (mBaseBinding) {
+    NS_ERROR("Base XBL prototype binding is already defined!");
+    return;
+  }
+
+  mBaseBinding = aBinding;
+}
+
+void
+nsXBLPrototypeBinding::SetBindingElement(nsIContent* aElement)
+{
+  mBinding = aElement;
+  if (mBinding->AttrValueIs(kNameSpaceID_None, nsGkAtoms::inheritstyle,
+                            nsGkAtoms::_false, eCaseMatters))
+    mInheritStyle = false;
+
+  mChromeOnlyContent = mBinding->AttrValueIs(kNameSpaceID_None,
+                                             nsGkAtoms::chromeOnlyContent,
+                                             nsGkAtoms::_true, eCaseMatters);
+
+  mBindToUntrustedContent = mBinding->AttrValueIs(kNameSpaceID_None,
+                                                  nsGkAtoms::bindToUntrustedContent,
+                                                  nsGkAtoms::_true, eCaseMatters);
+}
+
+bool
+nsXBLPrototypeBinding::GetAllowScripts() const
+{
+  return mXBLDocInfoWeak->GetScriptAccess();
+}
+
+bool
+nsXBLPrototypeBinding::LoadResources()
+{
+  if (mResources) {
+    bool result;
+    mResources->LoadResources(&result);
+    return result;
+  }
+
+  return true;
+}
+
+nsresult
+nsXBLPrototypeBinding::AddResource(nsIAtom* aResourceType, const nsAString& aSrc)
+{
+  EnsureResources();
+
+  mResources->AddResource(aResourceType, aSrc);
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::FlushSkinSheets()
+{
+  if (mResources)
+    return mResources->FlushSkinSheets();
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::BindingAttached(nsIContent* aBoundElement)
+{
+  if (mImplementation && mImplementation->CompiledMembers() &&
+      mImplementation->mConstructor)
+    return mImplementation->mConstructor->Execute(aBoundElement, MapURIToAddonID(mBindingURI));
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::BindingDetached(nsIContent* aBoundElement)
+{
+  if (mImplementation && mImplementation->CompiledMembers() &&
+      mImplementation->mDestructor)
+    return mImplementation->mDestructor->Execute(aBoundElement, MapURIToAddonID(mBindingURI));
+  return NS_OK;
+}
+
+nsXBLProtoImplAnonymousMethod*
+nsXBLPrototypeBinding::GetConstructor()
+{
+  if (mImplementation)
+    return mImplementation->mConstructor;
+
+  return nullptr;
+}
+
+nsXBLProtoImplAnonymousMethod*
+nsXBLPrototypeBinding::GetDestructor()
+{
+  if (mImplementation)
+    return mImplementation->mDestructor;
+
+  return nullptr;
+}
+
+nsresult
+nsXBLPrototypeBinding::SetConstructor(nsXBLProtoImplAnonymousMethod* aMethod)
+{
+  if (!mImplementation)
+    return NS_ERROR_FAILURE;
+  mImplementation->mConstructor = aMethod;
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::SetDestructor(nsXBLProtoImplAnonymousMethod* aMethod)
+{
+  if (!mImplementation)
+    return NS_ERROR_FAILURE;
+  mImplementation->mDestructor = aMethod;
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::InstallImplementation(nsXBLBinding* aBinding)
+{
+  if (mImplementation)
+    return mImplementation->InstallImplementation(this, aBinding);
+  return NS_OK;
+}
+
+// XXXbz this duplicates lots of SetAttrs
+void
+nsXBLPrototypeBinding::AttributeChanged(nsIAtom* aAttribute,
+                                        int32_t aNameSpaceID,
+                                        bool aRemoveFlag,
+                                        nsIContent* aChangedElement,
+                                        nsIContent* aAnonymousContent,
+                                        bool aNotify)
+{
+  if (!mAttributeTable)
+    return;
+
+  InnerAttributeTable *attributesNS = mAttributeTable->Get(aNameSpaceID);
+  if (!attributesNS)
+    return;
+
+  nsXBLAttributeEntry* xblAttr = attributesNS->Get(aAttribute);
+  if (!xblAttr)
+    return;
+
+  // Iterate over the elements in the array.
+  nsCOMPtr<nsIContent> content = GetImmediateChild(nsGkAtoms::content);
+  while (xblAttr) {
+    nsIContent* element = xblAttr->GetElement();
+
+    nsCOMPtr<nsIContent> realElement = LocateInstance(aChangedElement, content,
+                                                      aAnonymousContent,
+                                                      element);
+
+    if (realElement) {
+      // Hold a strong reference here so that the atom doesn't go away during
+      // UnsetAttr.
+      nsCOMPtr<nsIAtom> dstAttr = xblAttr->GetDstAttribute();
+      int32_t dstNs = xblAttr->GetDstNameSpace();
+
+      if (aRemoveFlag)
+        realElement->UnsetAttr(dstNs, dstAttr, aNotify);
+      else {
+        bool attrPresent = true;
+        nsAutoString value;
+        // Check to see if the src attribute is xbl:text.  If so, then we need to obtain the
+        // children of the real element and get the text nodes' values.
+        if (aAttribute == nsGkAtoms::text && aNameSpaceID == kNameSpaceID_XBL) {
+          nsContentUtils::GetNodeTextContent(aChangedElement, false, value);
+          value.StripChar(char16_t('\n'));
+          value.StripChar(char16_t('\r'));
+          nsAutoString stripVal(value);
+          stripVal.StripWhitespace();
+          if (stripVal.IsEmpty())
+            attrPresent = false;
+        }
+        else {
+          attrPresent = aChangedElement->GetAttr(aNameSpaceID, aAttribute, value);
+        }
+
+        if (attrPresent)
+          realElement->SetAttr(dstNs, dstAttr, value, aNotify);
+      }
+
+      // See if we're the <html> tag in XUL, and see if value is being
+      // set or unset on us.  We may also be a tag that is having
+      // xbl:text set on us.
+
+      if ((dstAttr == nsGkAtoms::text && dstNs == kNameSpaceID_XBL) ||
+          (realElement->NodeInfo()->Equals(nsGkAtoms::html,
+                                           kNameSpaceID_XUL) &&
+           dstAttr == nsGkAtoms::value)) {
+        // Flush out all our kids.
+        uint32_t childCount = realElement->GetChildCount();
+        for (uint32_t i = 0; i < childCount; i++)
+          realElement->RemoveChildAt(0, aNotify);
+
+        if (!aRemoveFlag) {
+          // Construct a new text node and insert it.
+          nsAutoString value;
+          aChangedElement->GetAttr(aNameSpaceID, aAttribute, value);
+          if (!value.IsEmpty()) {
+            RefPtr<nsTextNode> textContent =
+              new nsTextNode(realElement->NodeInfo()->NodeInfoManager());
+
+            textContent->SetText(value, true);
+            realElement->AppendChildTo(textContent, true);
+          }
+        }
+      }
+    }
+
+    xblAttr = xblAttr->GetNext();
+  }
+}
+
+void
+nsXBLPrototypeBinding::SetBaseTag(int32_t aNamespaceID, nsIAtom* aTag)
+{
+  mBaseNameSpaceID = aNamespaceID;
+  mBaseTag = aTag;
+}
+
+nsIAtom*
+nsXBLPrototypeBinding::GetBaseTag(int32_t* aNamespaceID)
+{
+  if (mBaseTag) {
+    *aNamespaceID = mBaseNameSpaceID;
+    return mBaseTag;
+  }
+
+  return nullptr;
+}
+
+bool
+nsXBLPrototypeBinding::ImplementsInterface(REFNSIID aIID) const
+{
+  // Check our IID table.
+  return !!mInterfaceTable.GetWeak(aIID);
+}
+
+// Internal helpers ///////////////////////////////////////////////////////////////////////
+
+nsIContent*
+nsXBLPrototypeBinding::GetImmediateChild(nsIAtom* aTag)
+{
+  for (nsIContent* child = mBinding->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    if (child->NodeInfo()->Equals(aTag, kNameSpaceID_XBL)) {
+      return child;
+    }
+  }
+
+  return nullptr;
+}
+
+nsresult
+nsXBLPrototypeBinding::InitClass(const nsString& aClassName,
+                                 JSContext * aContext,
+                                 JS::Handle<JSObject*> aScriptObject,
+                                 JS::MutableHandle<JSObject*> aClassObject,
+                                 bool* aNew)
+{
+  return nsXBLBinding::DoInitJSClass(aContext, aScriptObject,
+                                     aClassName, this, aClassObject, aNew);
+}
+
+nsIContent*
+nsXBLPrototypeBinding::LocateInstance(nsIContent* aBoundElement,
+                                      nsIContent* aTemplRoot,
+                                      nsIContent* aCopyRoot,
+                                      nsIContent* aTemplChild)
+{
+  // XXX We will get in trouble if the binding instantiation deviates from the template
+  // in the prototype.
+  if (aTemplChild == aTemplRoot || !aTemplChild)
+    return nullptr;
+
+  nsIContent* templParent = aTemplChild->GetParent();
+
+  // We may be disconnected from our parent during cycle collection.
+  if (!templParent)
+    return nullptr;
+
+  nsIContent *copyParent =
+    templParent == aTemplRoot ? aCopyRoot :
+                   LocateInstance(aBoundElement, aTemplRoot, aCopyRoot, templParent);
+
+  if (!copyParent)
+    return nullptr;
+
+  return copyParent->GetChildAt(templParent->IndexOf(aTemplChild));
+}
+
+void
+nsXBLPrototypeBinding::SetInitialAttributes(nsIContent* aBoundElement, nsIContent* aAnonymousContent)
+{
+  if (!mAttributeTable) {
+    return;
+  }
+
+  for (auto iter1 = mAttributeTable->Iter(); !iter1.Done(); iter1.Next()) {
+    InnerAttributeTable* xblAttributes = iter1.UserData();
+    if (xblAttributes) {
+      int32_t srcNamespace = iter1.Key();
+
+      for (auto iter2 = xblAttributes->Iter(); !iter2.Done(); iter2.Next()) {
+        // XXXbz this duplicates lots of AttributeChanged
+        nsXBLAttributeEntry* entry = iter2.UserData();
+        nsIAtom* src = entry->GetSrcAttribute();
+        nsAutoString value;
+        bool attrPresent = true;
+
+        if (src == nsGkAtoms::text && srcNamespace == kNameSpaceID_XBL) {
+          nsContentUtils::GetNodeTextContent(aBoundElement, false, value);
+          value.StripChar(char16_t('\n'));
+          value.StripChar(char16_t('\r'));
+          nsAutoString stripVal(value);
+          stripVal.StripWhitespace();
+
+          if (stripVal.IsEmpty()) {
+            attrPresent = false;
+          }
+        } else {
+          attrPresent = aBoundElement->GetAttr(srcNamespace, src, value);
+        }
+
+        if (attrPresent) {
+          nsIContent* content = GetImmediateChild(nsGkAtoms::content);
+
+          nsXBLAttributeEntry* curr = entry;
+          while (curr) {
+            nsIAtom* dst = curr->GetDstAttribute();
+            int32_t dstNs = curr->GetDstNameSpace();
+            nsIContent* element = curr->GetElement();
+
+            nsIContent* realElement =
+              LocateInstance(aBoundElement, content,
+                             aAnonymousContent, element);
+
+            if (realElement) {
+              realElement->SetAttr(dstNs, dst, value, false);
+
+              // XXXndeakin shouldn't this be done in lieu of SetAttr?
+              if ((dst == nsGkAtoms::text && dstNs == kNameSpaceID_XBL) ||
+                  (realElement->NodeInfo()->Equals(nsGkAtoms::html,
+                                                   kNameSpaceID_XUL) &&
+                   dst == nsGkAtoms::value && !value.IsEmpty())) {
+
+                RefPtr<nsTextNode> textContent =
+                  new nsTextNode(realElement->NodeInfo()->NodeInfoManager());
+
+                textContent->SetText(value, false);
+                realElement->AppendChildTo(textContent, false);
+              }
+            }
+
+            curr = curr->GetNext();
+          }
+        }
+      }
+    }
+  }
+}
+
+nsIStyleRuleProcessor*
+nsXBLPrototypeBinding::GetRuleProcessor()
+{
+  if (mResources) {
+    return mResources->GetRuleProcessor();
+  }
+
+  return nullptr;
+}
+
+void
+nsXBLPrototypeBinding::EnsureAttributeTable()
+{
+  if (!mAttributeTable) {
+    mAttributeTable =
+        new nsClassHashtable<nsUint32HashKey, InnerAttributeTable>(2);
+  }
+}
+
+void
+nsXBLPrototypeBinding::AddToAttributeTable(int32_t aSourceNamespaceID, nsIAtom* aSourceTag,
+                                           int32_t aDestNamespaceID, nsIAtom* aDestTag,
+                                           nsIContent* aContent)
+{
+    InnerAttributeTable* attributesNS = mAttributeTable->Get(aSourceNamespaceID);
+    if (!attributesNS) {
+      attributesNS = new InnerAttributeTable(2);
+      mAttributeTable->Put(aSourceNamespaceID, attributesNS);
+    }
+
+    nsXBLAttributeEntry* xblAttr =
+      new nsXBLAttributeEntry(aSourceTag, aDestTag, aDestNamespaceID, aContent);
+
+    nsXBLAttributeEntry* entry = attributesNS->Get(aSourceTag);
+    if (!entry) {
+      attributesNS->Put(aSourceTag, xblAttr);
+    } else {
+      while (entry->GetNext())
+        entry = entry->GetNext();
+      entry->SetNext(xblAttr);
+    }
+}
+
+void
+nsXBLPrototypeBinding::ConstructAttributeTable(nsIContent* aElement)
+{
+  // Don't add entries for <children> elements, since those will get
+  // removed from the DOM when we construct the insertion point table.
+  if (!aElement->NodeInfo()->Equals(nsGkAtoms::children, kNameSpaceID_XBL)) {
+    nsAutoString inherits;
+    aElement->GetAttr(kNameSpaceID_XBL, nsGkAtoms::inherits, inherits);
+
+    if (!inherits.IsEmpty()) {
+      EnsureAttributeTable();
+
+      // The user specified at least one attribute.
+      char* str = ToNewCString(inherits);
+      char* newStr;
+      // XXX We should use a strtok function that tokenizes PRUnichars
+      // so that we don't have to convert from Unicode to ASCII and then back
+
+      char* token = nsCRT::strtok( str, ", ", &newStr );
+      while( token != nullptr ) {
+        // Build an atom out of this attribute.
+        nsCOMPtr<nsIAtom> atom;
+        int32_t atomNsID = kNameSpaceID_None;
+        nsCOMPtr<nsIAtom> attribute;
+        int32_t attributeNsID = kNameSpaceID_None;
+
+        // Figure out if this token contains a :.
+        nsAutoString attrTok; attrTok.AssignWithConversion(token);
+        int32_t index = attrTok.Find("=", true);
+        nsresult rv;
+        if (index != -1) {
+          // This attribute maps to something different.
+          nsAutoString left, right;
+          attrTok.Left(left, index);
+          attrTok.Right(right, attrTok.Length()-index-1);
+
+          rv = nsContentUtils::SplitQName(aElement, left, &attributeNsID,
+                                          getter_AddRefs(attribute));
+          if (NS_FAILED(rv))
+            return;
+
+          rv = nsContentUtils::SplitQName(aElement, right, &atomNsID,
+                                          getter_AddRefs(atom));
+          if (NS_FAILED(rv))
+            return;
+        }
+        else {
+          nsAutoString tok;
+          tok.AssignWithConversion(token);
+          rv = nsContentUtils::SplitQName(aElement, tok, &atomNsID,
+                                          getter_AddRefs(atom));
+          if (NS_FAILED(rv))
+            return;
+          attribute = atom;
+          attributeNsID = atomNsID;
+        }
+
+        AddToAttributeTable(atomNsID, atom, attributeNsID, attribute, aElement);
+
+        // Now remove the inherits attribute from the element so that it doesn't
+        // show up on clones of the element.  It is used
+        // by the template only, and we don't need it anymore.
+        // XXXdwh Don't do this for XUL elements, since it faults them into heavyweight
+        // elements. Should nuke from the prototype instead.
+        // aElement->UnsetAttr(kNameSpaceID_XBL, nsGkAtoms::inherits, false);
+
+        token = nsCRT::strtok( newStr, ", ", &newStr );
+      }
+
+      free(str);
+    }
+  }
+
+  // Recur into our children.
+  for (nsIContent* child = aElement->GetFirstChild();
+       child;
+       child = child->GetNextSibling()) {
+    ConstructAttributeTable(child);
+  }
+}
+
+nsresult
+nsXBLPrototypeBinding::ConstructInterfaceTable(const nsAString& aImpls)
+{
+  if (!aImpls.IsEmpty()) {
+    // Obtain the interface info manager that can tell us the IID
+    // for a given interface name.
+    nsCOMPtr<nsIInterfaceInfoManager>
+      infoManager(do_GetService(NS_INTERFACEINFOMANAGER_SERVICE_CONTRACTID));
+    if (!infoManager)
+      return NS_ERROR_FAILURE;
+
+    // The user specified at least one attribute.
+    NS_ConvertUTF16toUTF8 utf8impl(aImpls);
+    char* str = utf8impl.BeginWriting();
+    char* newStr;
+    // XXX We should use a strtok function that tokenizes PRUnichars
+    // so that we don't have to convert from Unicode to ASCII and then back
+
+    char* token = nsCRT::strtok( str, ", ", &newStr );
+    while( token != nullptr ) {
+      // get the InterfaceInfo for the name
+      nsCOMPtr<nsIInterfaceInfo> iinfo;
+      infoManager->GetInfoForName(token, getter_AddRefs(iinfo));
+
+      if (iinfo) {
+        // obtain an IID.
+        const nsIID* iid = nullptr;
+        iinfo->GetIIDShared(&iid);
+
+        if (iid) {
+          // We found a valid iid.  Add it to our table.
+          mInterfaceTable.Put(*iid, mBinding);
+
+          // this block adds the parent interfaces of each interface
+          // defined in the xbl definition (implements="nsI...")
+          nsCOMPtr<nsIInterfaceInfo> parentInfo;
+          // if it has a parent, add it to the table
+          while (NS_SUCCEEDED(iinfo->GetParent(getter_AddRefs(parentInfo))) && parentInfo) {
+            // get the iid
+            parentInfo->GetIIDShared(&iid);
+
+            // don't add nsISupports to the table
+            if (!iid || iid->Equals(NS_GET_IID(nsISupports)))
+              break;
+
+            // add the iid to the table
+            mInterfaceTable.Put(*iid, mBinding);
+
+            // look for the next parent
+            iinfo = parentInfo;
+          }
+        }
+      }
+
+      token = nsCRT::strtok( newStr, ", ", &newStr );
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::AddResourceListener(nsIContent* aBoundElement)
+{
+  if (!mResources)
+    return NS_ERROR_FAILURE; // Makes no sense to add a listener when the binding
+                             // has no resources.
+
+  mResources->AddResourceListener(aBoundElement);
+  return NS_OK;
+}
+
+void
+nsXBLPrototypeBinding::CreateKeyHandlers()
+{
+  nsXBLPrototypeHandler* curr = mPrototypeHandler;
+  while (curr) {
+    nsCOMPtr<nsIAtom> eventAtom = curr->GetEventName();
+    if (eventAtom == nsGkAtoms::keyup ||
+        eventAtom == nsGkAtoms::keydown ||
+        eventAtom == nsGkAtoms::keypress) {
+      uint8_t phase = curr->GetPhase();
+      uint8_t type = curr->GetType();
+
+      int32_t count = mKeyHandlers.Count();
+      int32_t i;
+      nsXBLKeyEventHandler* handler = nullptr;
+      for (i = 0; i < count; ++i) {
+        handler = mKeyHandlers[i];
+        if (handler->Matches(eventAtom, phase, type))
+          break;
+      }
+
+      if (i == count) {
+        RefPtr<nsXBLKeyEventHandler> newHandler =
+          new nsXBLKeyEventHandler(eventAtom, phase, type);
+        mKeyHandlers.AppendObject(newHandler);
+        handler = newHandler;
+      }
+
+      if (handler)
+        handler->AddProtoHandler(curr);
+    }
+
+    curr = curr->GetNextHandler();
+  }
+}
+
+class XBLPrototypeSetupCleanup
+{
+public:
+  XBLPrototypeSetupCleanup(nsXBLDocumentInfo* aDocInfo, const nsACString& aID)
+  : mDocInfo(aDocInfo), mID(aID) {}
+
+  ~XBLPrototypeSetupCleanup()
+  {
+    if (mDocInfo) {
+      mDocInfo->RemovePrototypeBinding(mID);
+    }
+  }
+
+  void Disconnect()
+  {
+    mDocInfo = nullptr;
+  }
+
+  nsXBLDocumentInfo* mDocInfo;
+  nsAutoCString mID;
+};
+
+nsresult
+nsXBLPrototypeBinding::Read(nsIObjectInputStream* aStream,
+                            nsXBLDocumentInfo* aDocInfo,
+                            nsIDocument* aDocument,
+                            uint8_t aFlags)
+{
+  mInheritStyle = (aFlags & XBLBinding_Serialize_InheritStyle) ? true : false;
+  mChromeOnlyContent =
+    (aFlags & XBLBinding_Serialize_ChromeOnlyContent) ? true : false;
+  mBindToUntrustedContent =
+    (aFlags & XBLBinding_Serialize_BindToUntrustedContent) ? true : false;
+
+  // nsXBLContentSink::ConstructBinding doesn't create a binding with an empty
+  // id, so we don't here either.
+  nsAutoCString id;
+  nsresult rv = aStream->ReadCString(id);
+
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(!id.IsEmpty(), NS_ERROR_FAILURE);
+
+  nsAutoCString baseBindingURI;
+  rv = aStream->ReadCString(baseBindingURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mCheckedBaseProto = true;
+
+  if (!baseBindingURI.IsEmpty()) {
+    rv = NS_NewURI(getter_AddRefs(mBaseBindingURI), baseBindingURI);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = ReadNamespace(aStream, mBaseNameSpaceID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString baseTag;
+  rv = aStream->ReadString(baseTag);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!baseTag.IsEmpty()) {
+    mBaseTag = NS_Atomize(baseTag);
+  }
+
+  mBinding = aDocument->CreateElem(NS_LITERAL_STRING("binding"), nullptr,
+                                   kNameSpaceID_XBL);
+
+  nsCOMPtr<nsIContent> child;
+  rv = ReadContentNode(aStream, aDocument, aDocument->NodeInfoManager(), getter_AddRefs(child));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  Element* rootElement = aDocument->GetRootElement();
+  if (rootElement)
+    rootElement->AppendChildTo(mBinding, false);
+
+  if (child) {
+    mBinding->AppendChildTo(child, false);
+  }
+
+  uint32_t interfaceCount;
+  rv = aStream->Read32(&interfaceCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (; interfaceCount > 0; interfaceCount--) {
+    nsIID iid;
+    rv = aStream->ReadID(&iid);
+    NS_ENSURE_SUCCESS(rv, rv);
+    mInterfaceTable.Put(iid, mBinding);
+  }
+
+  // We're not directly using this AutoJSAPI here, but callees use it via
+  // AutoJSContext.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(xpc::CompilationScope())) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  bool isFirstBinding = aFlags & XBLBinding_Serialize_IsFirstBinding;
+  rv = Init(id, aDocInfo, nullptr, isFirstBinding);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // We need to set the prototype binding before reading the nsXBLProtoImpl,
+  // as it may be retrieved within.
+  rv = aDocInfo->SetPrototypeBinding(id, this);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  XBLPrototypeSetupCleanup cleanup(aDocInfo, id);
+
+  nsAutoCString className;
+  rv = aStream->ReadCString(className);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!className.IsEmpty()) {
+    nsXBLProtoImpl* impl; // NS_NewXBLProtoImpl will set mImplementation for us
+    NS_NewXBLProtoImpl(this, NS_ConvertUTF8toUTF16(className).get(), &impl);
+
+    // This needs to happen after SetPrototypeBinding as calls are made to
+    // retrieve the mapped bindings from within here. However, if an error
+    // occurs, the mapping should be removed again so that we don't keep an
+    // invalid binding around.
+    rv = mImplementation->Read(aStream, this);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Next read in the handlers.
+  nsXBLPrototypeHandler* previousHandler = nullptr;
+
+  do {
+    XBLBindingSerializeDetails type;
+    rv = aStream->Read8(&type);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (type == XBLBinding_Serialize_NoMoreItems)
+      break;
+
+    NS_ASSERTION((type & XBLBinding_Serialize_Mask) == XBLBinding_Serialize_Handler,
+                 "invalid handler type");
+
+    nsXBLPrototypeHandler* handler = new nsXBLPrototypeHandler(this);
+    rv = handler->Read(aStream);
+    if (NS_FAILED(rv)) {
+      delete handler;
+      return rv;
+    }
+
+    if (previousHandler) {
+      previousHandler->SetNextHandler(handler);
+    }
+    else {
+      SetPrototypeHandlers(handler);
+    }
+    previousHandler = handler;
+  } while (1);
+
+  if (mBinding) {
+    while (true) {
+      XBLBindingSerializeDetails type;
+      rv = aStream->Read8(&type);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      if (type != XBLBinding_Serialize_Attribute) {
+        break;
+      }
+
+      int32_t attrNamespace;
+      rv = ReadNamespace(aStream, attrNamespace);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoString attrPrefix, attrName, attrValue;
+      rv = aStream->ReadString(attrPrefix);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = aStream->ReadString(attrName);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = aStream->ReadString(attrValue);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsIAtom> atomPrefix = NS_Atomize(attrPrefix);
+      nsCOMPtr<nsIAtom> atomName = NS_Atomize(attrName);
+      mBinding->SetAttr(attrNamespace, atomName, atomPrefix, attrValue, false);
+    }
+  }
+
+  // Finally, read in the resources.
+  while (true) {
+    XBLBindingSerializeDetails type;
+    rv = aStream->Read8(&type);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (type == XBLBinding_Serialize_NoMoreItems)
+      break;
+
+    NS_ASSERTION((type & XBLBinding_Serialize_Mask) == XBLBinding_Serialize_Stylesheet ||
+                 (type & XBLBinding_Serialize_Mask) == XBLBinding_Serialize_Image, "invalid resource type");
+
+    nsAutoString src;
+    rv = aStream->ReadString(src);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    AddResource(type == XBLBinding_Serialize_Stylesheet ? nsGkAtoms::stylesheet :
+                                                          nsGkAtoms::image, src);
+  }
+
+  if (isFirstBinding) {
+    aDocInfo->SetFirstPrototypeBinding(this);
+  }
+
+  cleanup.Disconnect();
+  return NS_OK;
+}
+
+// static
+nsresult
+nsXBLPrototypeBinding::ReadNewBinding(nsIObjectInputStream* aStream,
+                                      nsXBLDocumentInfo* aDocInfo,
+                                      nsIDocument* aDocument,
+                                      uint8_t aFlags)
+{
+  // If the Read() succeeds, |binding| will end up being owned by aDocInfo's
+  // binding table. Otherwise, we must manually delete it.
+  nsXBLPrototypeBinding* binding = new nsXBLPrototypeBinding();
+  nsresult rv = binding->Read(aStream, aDocInfo, aDocument, aFlags);
+  if (NS_FAILED(rv)) {
+    delete binding;
+  }
+  return rv;
+}
+
+nsresult
+nsXBLPrototypeBinding::Write(nsIObjectOutputStream* aStream)
+{
+  // This writes out the binding. Note that mCheckedBaseProto,
+  // mKeyHandlersRegistered and mKeyHandlers are not serialized as they are
+  // computed on demand.
+
+  // We're not directly using this AutoJSAPI here, but callees use it via
+  // AutoJSContext.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(xpc::CompilationScope())) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  uint8_t flags = mInheritStyle ? XBLBinding_Serialize_InheritStyle : 0;
+
+  // mAlternateBindingURI is only set on the first binding.
+  if (mAlternateBindingURI) {
+    flags |= XBLBinding_Serialize_IsFirstBinding;
+  }
+
+  if (mChromeOnlyContent) {
+    flags |= XBLBinding_Serialize_ChromeOnlyContent;
+  }
+
+  if (mBindToUntrustedContent) {
+    flags |= XBLBinding_Serialize_BindToUntrustedContent;
+  }
+
+  nsresult rv = aStream->Write8(flags);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString id;
+  mBindingURI->GetRef(id);
+  rv = aStream->WriteStringZ(id.get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // write out the extends and display attribute values
+  nsAutoCString extends;
+  ResolveBaseBinding();
+  if (mBaseBindingURI) {
+    rv = mBaseBindingURI->GetSpec(extends);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = aStream->WriteStringZ(extends.get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = WriteNamespace(aStream, mBaseNameSpaceID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString baseTag;
+  if (mBaseTag) {
+    mBaseTag->ToString(baseTag);
+  }
+  rv = aStream->WriteWStringZ(baseTag.get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsIContent* content = GetImmediateChild(nsGkAtoms::content);
+  if (content) {
+    rv = WriteContentNode(aStream, content);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  else {
+    // Write a marker to indicate that there is no content.
+    rv = aStream->Write8(XBLBinding_Serialize_NoContent);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Enumerate and write out the implemented interfaces.
+  rv = aStream->Write32(mInterfaceTable.Count());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (auto iter = mInterfaceTable.Iter(); !iter.Done(); iter.Next()) {
+    // We can just write out the ids. The cache will be invalidated when a
+    // different build is used, so we don't need to worry about ids changing.
+    aStream->WriteID(iter.Key());
+  }
+
+  // Write out the implementation details.
+  if (mImplementation) {
+    rv = mImplementation->Write(aStream, this);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  else {
+    // Write out an empty classname. This indicates that the binding does not
+    // define an implementation.
+    rv = aStream->WriteUtf8Z(EmptyString().get());
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Write out the handlers.
+  nsXBLPrototypeHandler* handler = mPrototypeHandler;
+  while (handler) {
+    rv = handler->Write(aStream);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    handler = handler->GetNextHandler();
+  }
+
+  aStream->Write8(XBLBinding_Serialize_NoMoreItems);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (mBinding) {
+    uint32_t attributes = mBinding->GetAttrCount();
+    nsAutoString attrValue;
+    for (uint32_t i = 0; i < attributes; ++i) {
+      BorrowedAttrInfo attrInfo = mBinding->GetAttrInfoAt(i);
+      const nsAttrName* name = attrInfo.mName;
+      nsDependentAtomString attrName(attrInfo.mName->LocalName());
+      attrInfo.mValue->ToString(attrValue);
+
+      rv = aStream->Write8(XBLBinding_Serialize_Attribute);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = WriteNamespace(aStream, name->NamespaceID());
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsIAtom* prefix = name->GetPrefix();
+      nsAutoString prefixString;
+      if (prefix) {
+        prefix->ToString(prefixString);
+      }
+
+      rv = aStream->WriteWStringZ(prefixString.get());
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = aStream->WriteWStringZ(attrName.get());
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = aStream->WriteWStringZ(attrValue.get());
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+
+  aStream->Write8(XBLBinding_Serialize_NoMoreItems);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Write out the resources
+  if (mResources) {
+    rv = mResources->Write(aStream);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Write out an end mark at the end.
+  return aStream->Write8(XBLBinding_Serialize_NoMoreItems);
+}
+
+nsresult
+nsXBLPrototypeBinding::ReadContentNode(nsIObjectInputStream* aStream,
+                                       nsIDocument* aDocument,
+                                       nsNodeInfoManager* aNim,
+                                       nsIContent** aContent)
+{
+  *aContent = nullptr;
+
+  int32_t namespaceID;
+  nsresult rv = ReadNamespace(aStream, namespaceID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // There is no content to read so just return.
+  if (namespaceID == XBLBinding_Serialize_NoContent)
+    return NS_OK;
+
+  nsCOMPtr<nsIContent> content;
+
+  // If this is a text type, just read the string and return.
+  if (namespaceID == XBLBinding_Serialize_TextNode ||
+      namespaceID == XBLBinding_Serialize_CDATANode ||
+      namespaceID == XBLBinding_Serialize_CommentNode) {
+    switch (namespaceID) {
+      case XBLBinding_Serialize_TextNode:
+        content = new nsTextNode(aNim);
+        break;
+      case XBLBinding_Serialize_CDATANode:
+        content = new CDATASection(aNim);
+        break;
+      case XBLBinding_Serialize_CommentNode:
+        content = new Comment(aNim);
+        break;
+      default:
+        break;
+    }
+
+    nsAutoString text;
+    rv = aStream->ReadString(text);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    content->SetText(text, false);
+    content.swap(*aContent);
+    return NS_OK;
+  }
+
+  // Otherwise, it's an element, so read its tag, attributes and children.
+  nsAutoString prefix, tag;
+  rv = aStream->ReadString(prefix);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIAtom> prefixAtom;
+  if (!prefix.IsEmpty())
+    prefixAtom = NS_Atomize(prefix);
+
+  rv = aStream->ReadString(tag);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIAtom> tagAtom = NS_Atomize(tag);
+  RefPtr<NodeInfo> nodeInfo =
+    aNim->GetNodeInfo(tagAtom, prefixAtom, namespaceID, nsIDOMNode::ELEMENT_NODE);
+
+  uint32_t attrCount;
+  rv = aStream->Read32(&attrCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Create XUL prototype elements, or regular elements for other namespaces.
+  // This needs to match the code in nsXBLContentSink::CreateElement.
+#ifdef MOZ_XUL
+  if (namespaceID == kNameSpaceID_XUL) {
+    nsIURI* documentURI = aDocument->GetDocumentURI();
+
+    RefPtr<nsXULPrototypeElement> prototype = new nsXULPrototypeElement();
+
+    prototype->mNodeInfo = nodeInfo;
+
+    nsXULPrototypeAttribute* attrs = nullptr;
+    if (attrCount > 0) {
+      attrs = new nsXULPrototypeAttribute[attrCount];
+    }
+
+    prototype->mAttributes = attrs;
+    prototype->mNumAttributes = attrCount;
+
+    for (uint32_t i = 0; i < attrCount; i++) {
+      rv = ReadNamespace(aStream, namespaceID);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoString prefix, name, val;
+      rv = aStream->ReadString(prefix);
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = aStream->ReadString(name);
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = aStream->ReadString(val);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsIAtom> nameAtom = NS_Atomize(name);
+      if (namespaceID == kNameSpaceID_None) {
+        attrs[i].mName.SetTo(nameAtom);
+      }
+      else {
+        nsCOMPtr<nsIAtom> prefixAtom;
+        if (!prefix.IsEmpty())
+          prefixAtom = NS_Atomize(prefix);
+
+        RefPtr<NodeInfo> ni =
+          aNim->GetNodeInfo(nameAtom, prefixAtom,
+                            namespaceID, nsIDOMNode::ATTRIBUTE_NODE);
+        attrs[i].mName.SetTo(ni);
+      }
+
+      rv = prototype->SetAttrAt(i, val, documentURI);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+
+    nsCOMPtr<Element> result;
+    nsresult rv =
+      nsXULElement::Create(prototype, aDocument, false, false, getter_AddRefs(result));
+    NS_ENSURE_SUCCESS(rv, rv);
+    content = result;
+  }
+  else {
+#endif
+    nsCOMPtr<Element> element;
+    NS_NewElement(getter_AddRefs(element), nodeInfo.forget(), NOT_FROM_PARSER);
+    content = element;
+
+    for (uint32_t i = 0; i < attrCount; i++) {
+      rv = ReadNamespace(aStream, namespaceID);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoString prefix, name, val;
+      rv = aStream->ReadString(prefix);
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = aStream->ReadString(name);
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = aStream->ReadString(val);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsIAtom> prefixAtom;
+      if (!prefix.IsEmpty())
+        prefixAtom = NS_Atomize(prefix);
+
+      nsCOMPtr<nsIAtom> nameAtom = NS_Atomize(name);
+      content->SetAttr(namespaceID, nameAtom, prefixAtom, val, false);
+    }
+
+#ifdef MOZ_XUL
+  }
+#endif
+
+  // Now read the attribute forwarding entries (xbl:inherits)
+
+  int32_t srcNamespaceID, destNamespaceID;
+  rv = ReadNamespace(aStream, srcNamespaceID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  while (srcNamespaceID != XBLBinding_Serialize_NoMoreAttributes) {
+    nsAutoString srcAttribute, destAttribute;
+    rv = aStream->ReadString(srcAttribute);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = ReadNamespace(aStream, destNamespaceID);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = aStream->ReadString(destAttribute);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIAtom> srcAtom = NS_Atomize(srcAttribute);
+    nsCOMPtr<nsIAtom> destAtom = NS_Atomize(destAttribute);
+
+    EnsureAttributeTable();
+    AddToAttributeTable(srcNamespaceID, srcAtom, destNamespaceID, destAtom, content);
+
+    rv = ReadNamespace(aStream, srcNamespaceID);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Finally, read in the child nodes.
+  uint32_t childCount;
+  rv = aStream->Read32(&childCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (uint32_t i = 0; i < childCount; i++) {
+    nsCOMPtr<nsIContent> child;
+    ReadContentNode(aStream, aDocument, aNim, getter_AddRefs(child));
+
+    // Child may be null if this was a comment for example and can just be ignored.
+    if (child) {
+      content->AppendChildTo(child, false);
+    }
+  }
+
+  content.swap(*aContent);
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::WriteContentNode(nsIObjectOutputStream* aStream,
+                                        nsIContent* aNode)
+{
+  nsresult rv;
+
+  if (!aNode->IsElement()) {
+    // Text is writen out as a single byte for the type, followed by the text.
+    uint8_t type = XBLBinding_Serialize_NoContent;
+    switch (aNode->NodeType()) {
+      case nsIDOMNode::TEXT_NODE:
+        type = XBLBinding_Serialize_TextNode;
+        break;
+      case nsIDOMNode::CDATA_SECTION_NODE:
+        type = XBLBinding_Serialize_CDATANode;
+        break;
+      case nsIDOMNode::COMMENT_NODE:
+        type = XBLBinding_Serialize_CommentNode;
+        break;
+      default:
+        break;
+    }
+
+    rv = aStream->Write8(type);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoString content;
+    aNode->GetText()->AppendTo(content);
+    return aStream->WriteWStringZ(content.get());
+  }
+
+  // Otherwise, this is an element.
+
+  // Write the namespace id followed by the tag name
+  rv = WriteNamespace(aStream, aNode->GetNameSpaceID());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString prefixStr;
+  aNode->NodeInfo()->GetPrefix(prefixStr);
+  rv = aStream->WriteWStringZ(prefixStr.get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aStream->WriteWStringZ(nsDependentAtomString(aNode->NodeInfo()->NameAtom()).get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Write attributes
+  uint32_t count = aNode->GetAttrCount();
+  rv = aStream->Write32(count);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t i;
+  for (i = 0; i < count; i++) {
+    // Write out the namespace id, the namespace prefix, the local tag name,
+    // and the value, in that order.
+
+    const BorrowedAttrInfo attrInfo = aNode->GetAttrInfoAt(i);
+    const nsAttrName* name = attrInfo.mName;
+
+    // XXXndeakin don't write out xbl:inherits?
+    int32_t namespaceID = name->NamespaceID();
+    rv = WriteNamespace(aStream, namespaceID);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoString prefixStr;
+    nsIAtom* prefix = name->GetPrefix();
+    if (prefix)
+      prefix->ToString(prefixStr);
+    rv = aStream->WriteWStringZ(prefixStr.get());
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aStream->WriteWStringZ(nsDependentAtomString(name->LocalName()).get());
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoString val;
+    attrInfo.mValue->ToString(val);
+    rv = aStream->WriteWStringZ(val.get());
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Write out the attribute fowarding information
+  if (mAttributeTable) {
+    for (auto iter1 = mAttributeTable->Iter(); !iter1.Done(); iter1.Next()) {
+      int32_t srcNamespace = iter1.Key();
+      InnerAttributeTable* xblAttributes = iter1.UserData();
+
+      for (auto iter2 = xblAttributes->Iter(); !iter2.Done(); iter2.Next()) {
+        nsXBLAttributeEntry* entry = iter2.UserData();
+
+        do {
+          if (entry->GetElement() == aNode) {
+            WriteNamespace(aStream, srcNamespace);
+            aStream->WriteWStringZ(
+              nsDependentAtomString(entry->GetSrcAttribute()).get());
+            WriteNamespace(aStream, entry->GetDstNameSpace());
+            aStream->WriteWStringZ(
+              nsDependentAtomString(entry->GetDstAttribute()).get());
+          }
+
+          entry = entry->GetNext();
+        } while (entry);
+      }
+    }
+  }
+  rv = aStream->Write8(XBLBinding_Serialize_NoMoreAttributes);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Finally, write out the child nodes.
+  count = aNode->GetChildCount();
+  rv = aStream->Write32(count);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (i = 0; i < count; i++) {
+    rv = WriteContentNode(aStream, aNode->GetChildAt(i));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::ReadNamespace(nsIObjectInputStream* aStream,
+                                     int32_t& aNameSpaceID)
+{
+  uint8_t namespaceID;
+  nsresult rv = aStream->Read8(&namespaceID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (namespaceID == XBLBinding_Serialize_CustomNamespace) {
+    nsAutoString namesp;
+    rv = aStream->ReadString(namesp);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsContentUtils::NameSpaceManager()->RegisterNameSpace(namesp, aNameSpaceID);
+  }
+  else {
+    aNameSpaceID = namespaceID;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeBinding::WriteNamespace(nsIObjectOutputStream* aStream,
+                                      int32_t aNameSpaceID)
+{
+  // Namespaces are stored as a single byte id for well-known namespaces.
+  // This saves time and space as other namespaces aren't very common in
+  // XBL. If another namespace is used however, the namespace id will be
+  // XBLBinding_Serialize_CustomNamespace and the string namespace written
+  // out directly afterwards.
+  nsresult rv;
+
+  if (aNameSpaceID <= kNameSpaceID_LastBuiltin) {
+    rv = aStream->Write8((int8_t)aNameSpaceID);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  else {
+    rv = aStream->Write8(XBLBinding_Serialize_CustomNamespace);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoString namesp;
+    nsContentUtils::NameSpaceManager()->GetNameSpaceURI(aNameSpaceID, namesp);
+    aStream->WriteWStringZ(namesp.get());
+  }
+
+  return NS_OK;
+}
+
+
+bool CheckTagNameWhiteList(int32_t aNameSpaceID, nsIAtom *aTagName)
+{
+  static nsIContent::AttrValuesArray kValidXULTagNames[] =  {
+    &nsGkAtoms::autorepeatbutton, &nsGkAtoms::box, &nsGkAtoms::browser,
+    &nsGkAtoms::button, &nsGkAtoms::hbox, &nsGkAtoms::image, &nsGkAtoms::menu,
+    &nsGkAtoms::menubar, &nsGkAtoms::menuitem, &nsGkAtoms::menupopup,
+    &nsGkAtoms::row, &nsGkAtoms::slider, &nsGkAtoms::spacer,
+    &nsGkAtoms::splitter, &nsGkAtoms::text, &nsGkAtoms::tree, nullptr};
+
+  uint32_t i;
+  if (aNameSpaceID == kNameSpaceID_XUL) {
+    for (i = 0; kValidXULTagNames[i]; ++i) {
+      if (aTagName == *(kValidXULTagNames[i])) {
+        return true;
+      }
+    }
+  }
+  else if (aNameSpaceID == kNameSpaceID_SVG &&
+           aTagName == nsGkAtoms::generic_) {
+    return true;
+  }
+
+  return false;
+}
+
+nsresult
+nsXBLPrototypeBinding::ResolveBaseBinding()
+{
+  if (mCheckedBaseProto)
+    return NS_OK;
+  mCheckedBaseProto = true;
+
+  nsCOMPtr<nsIDocument> doc = mXBLDocInfoWeak->GetDocument();
+
+  // Check for the presence of 'extends' and 'display' attributes
+  nsAutoString display, extends;
+  mBinding->GetAttr(kNameSpaceID_None, nsGkAtoms::extends, extends);
+  if (extends.IsEmpty())
+    return NS_OK;
+
+  mBinding->GetAttr(kNameSpaceID_None, nsGkAtoms::display, display);
+  bool hasDisplay = !display.IsEmpty();
+
+  nsAutoString value(extends);
+
+  // Now slice 'em up to see what we've got.
+  nsAutoString prefix;
+  int32_t offset;
+  if (hasDisplay) {
+    offset = display.FindChar(':');
+    if (-1 != offset) {
+      display.Left(prefix, offset);
+      display.Cut(0, offset+1);
+    }
+  }
+  else {
+    offset = extends.FindChar(':');
+    if (-1 != offset) {
+      extends.Left(prefix, offset);
+      extends.Cut(0, offset+1);
+      display = extends;
+    }
+  }
+
+  nsAutoString nameSpace;
+
+  if (!prefix.IsEmpty()) {
+    mBinding->LookupNamespaceURI(prefix, nameSpace);
+    if (!nameSpace.IsEmpty()) {
+      int32_t nameSpaceID =
+        nsContentUtils::NameSpaceManager()->GetNameSpaceID(nameSpace,
+                                                           nsContentUtils::IsChromeDoc(doc));
+
+      nsCOMPtr<nsIAtom> tagName = NS_Atomize(display);
+      // Check the white list
+      if (!CheckTagNameWhiteList(nameSpaceID, tagName)) {
+        const char16_t* params[] = { display.get() };
+        nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
+                                        NS_LITERAL_CSTRING("XBL"), nullptr,
+                                        nsContentUtils::eXBL_PROPERTIES,
+                                       "InvalidExtendsBinding",
+                                        params, ArrayLength(params),
+                                        doc->GetDocumentURI());
+        NS_ASSERTION(!nsXBLService::IsChromeOrResourceURI(doc->GetDocumentURI()),
+                     "Invalid extends value");
+        return NS_ERROR_ILLEGAL_VALUE;
+      }
+
+      SetBaseTag(nameSpaceID, tagName);
+    }
+  }
+
+  if (hasDisplay || nameSpace.IsEmpty()) {
+    mBinding->UnsetAttr(kNameSpaceID_None, nsGkAtoms::extends, false);
+    mBinding->UnsetAttr(kNameSpaceID_None, nsGkAtoms::display, false);
+
+    return NS_NewURI(getter_AddRefs(mBaseBindingURI), value,
+                     doc->GetDocumentCharacterSet().get(),
+                     doc->GetDocBaseURI());
+  }
+
+  return NS_OK;
+}
+
+void
+nsXBLPrototypeBinding::EnsureResources()
+{
+  if (!mResources) {
+    mResources = new nsXBLPrototypeResources(this);
+  }
+}
+
+void
+nsXBLPrototypeBinding::AppendStyleSheet(StyleSheet* aSheet)
+{
+  EnsureResources();
+  mResources->AppendStyleSheet(aSheet);
+}
+
+void
+nsXBLPrototypeBinding::RemoveStyleSheet(StyleSheet* aSheet)
+{
+  if (!mResources) {
+    MOZ_ASSERT(false, "Trying to remove a sheet that does not exist.");
+    return;
+  }
+
+  mResources->RemoveStyleSheet(aSheet);
+}
+void
+nsXBLPrototypeBinding::InsertStyleSheetAt(size_t aIndex, StyleSheet* aSheet)
+{
+  EnsureResources();
+  mResources->InsertStyleSheetAt(aIndex, aSheet);
+}
+
+StyleSheet*
+nsXBLPrototypeBinding::StyleSheetAt(size_t aIndex) const
+{
+  MOZ_ASSERT(mResources);
+  return mResources->StyleSheetAt(aIndex);
+}
+
+size_t
+nsXBLPrototypeBinding::SheetCount() const
+{
+  return mResources ? mResources->SheetCount() : 0;
+}
+
+bool
+nsXBLPrototypeBinding::HasStyleSheets() const
+{
+  return mResources && mResources->HasStyleSheets();
+}
+
+void
+nsXBLPrototypeBinding::AppendStyleSheetsTo(
+                                      nsTArray<StyleSheet*>& aResult) const
+{
+  if (mResources) {
+    mResources->AppendStyleSheetsTo(aResult);
+  }
+}
diff --git a/dom/xbl/nsXBLPrototypeBinding.h b/dom/xbl/nsXBLPrototypeBinding.h
new file mode 100644
index 0000000000..4c51a2083f
--- /dev/null
+++ b/dom/xbl/nsXBLPrototypeBinding.h
@@ -0,0 +1,359 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLPrototypeBinding_h__
+#define nsXBLPrototypeBinding_h__
+
+#include "nsAutoPtr.h"
+#include "nsClassHashtable.h"
+#include "nsCOMArray.h"
+#include "nsCOMPtr.h"
+#include "nsICSSLoaderObserver.h"
+#include "nsInterfaceHashtable.h"
+#include "nsWeakReference.h"
+#include "nsXBLDocumentInfo.h"
+#include "nsXBLProtoImpl.h"
+#include "nsXBLProtoImplMethod.h"
+#include "nsXBLPrototypeHandler.h"
+#include "nsXBLPrototypeResources.h"
+#include "mozilla/WeakPtr.h"
+#include "mozilla/StyleSheet.h"
+
+class nsIAtom;
+class nsIContent;
+class nsIDocument;
+class nsXBLAttributeEntry;
+class nsXBLBinding;
+class nsXBLProtoImplField;
+
+// *********************************************************************/
+// The XBLPrototypeBinding class
+
+// Instances of this class are owned by the nsXBLDocumentInfo object returned
+// by XBLDocumentInfo().  Consumers who want to refcount things should refcount
+// that.
+class nsXBLPrototypeBinding final :
+  public mozilla::SupportsWeakPtr<nsXBLPrototypeBinding>
+{
+public:
+  MOZ_DECLARE_WEAKREFERENCE_TYPENAME(nsXBLPrototypeBinding)
+
+  nsIContent* GetBindingElement() const { return mBinding; }
+  void SetBindingElement(nsIContent* aElement);
+
+  nsIURI* BindingURI() const { return mBindingURI; }
+  nsIURI* AlternateBindingURI() const { return mAlternateBindingURI; }
+  nsIURI* DocURI() const { return mXBLDocInfoWeak->DocumentURI(); }
+  nsIURI* GetBaseBindingURI() const { return mBaseBindingURI; }
+
+  // Checks if aURI refers to this binding by comparing to both possible
+  // binding URIs.
+  bool CompareBindingURI(nsIURI* aURI) const;
+
+  bool GetAllowScripts() const;
+
+  nsresult BindingAttached(nsIContent* aBoundElement);
+  nsresult BindingDetached(nsIContent* aBoundElement);
+
+  bool LoadResources();
+  nsresult AddResource(nsIAtom* aResourceType, const nsAString& aSrc);
+
+  bool InheritsStyle() const { return mInheritStyle; }
+  void SetInheritsStyle(bool aInheritStyle) { mInheritStyle = aInheritStyle; }
+
+  nsXBLPrototypeHandler* GetPrototypeHandlers() { return mPrototypeHandler; }
+  void SetPrototypeHandlers(nsXBLPrototypeHandler* aHandler) { mPrototypeHandler = aHandler; }
+
+  nsXBLProtoImplAnonymousMethod* GetConstructor();
+  nsresult SetConstructor(nsXBLProtoImplAnonymousMethod* aConstructor);
+  nsXBLProtoImplAnonymousMethod* GetDestructor();
+  nsresult SetDestructor(nsXBLProtoImplAnonymousMethod* aDestructor);
+
+  nsXBLProtoImplField* FindField(const nsString& aFieldName) const
+  {
+    return mImplementation ? mImplementation->FindField(aFieldName) : nullptr;
+  }
+
+  // Resolve all the fields for this binding on the object |obj|.
+  // False return means a JS exception was set.
+  bool ResolveAllFields(JSContext* cx, JS::Handle<JSObject*> obj) const
+  {
+    return !mImplementation || mImplementation->ResolveAllFields(cx, obj);
+  }
+
+  // Undefine all our fields from object |obj| (which should be a
+  // JSObject for a bound element).
+  void UndefineFields(JSContext* cx, JS::Handle<JSObject*> obj) const {
+    if (mImplementation) {
+      mImplementation->UndefineFields(cx, obj);
+    }
+  }
+
+  const nsString& ClassName() const {
+    return mImplementation ? mImplementation->mClassName : EmptyString();
+  }
+
+  nsresult InitClass(const nsString& aClassName, JSContext* aContext,
+                     JS::Handle<JSObject*> aScriptObject,
+                     JS::MutableHandle<JSObject*> aClassObject,
+                     bool* aNew);
+
+  nsresult ConstructInterfaceTable(const nsAString& aImpls);
+
+  void SetImplementation(nsXBLProtoImpl* aImpl) { mImplementation = aImpl; }
+  nsXBLProtoImpl* GetImplementation() { return mImplementation; }
+  nsresult InstallImplementation(nsXBLBinding* aBinding);
+  bool HasImplementation() const { return mImplementation != nullptr; }
+
+  void AttributeChanged(nsIAtom* aAttribute, int32_t aNameSpaceID,
+                        bool aRemoveFlag, nsIContent* aChangedElement,
+                        nsIContent* aAnonymousContent, bool aNotify);
+
+  void SetBasePrototype(nsXBLPrototypeBinding* aBinding);
+  nsXBLPrototypeBinding* GetBasePrototype() { return mBaseBinding; }
+
+  nsXBLDocumentInfo* XBLDocumentInfo() const { return mXBLDocInfoWeak; }
+  bool IsChrome() { return mXBLDocInfoWeak->IsChrome(); }
+
+  void SetInitialAttributes(nsIContent* aBoundElement, nsIContent* aAnonymousContent);
+
+  void AppendStyleSheet(mozilla::StyleSheet* aSheet);
+  void RemoveStyleSheet(mozilla::StyleSheet* aSheet);
+  void InsertStyleSheetAt(size_t aIndex, mozilla::StyleSheet* aSheet);
+  mozilla::StyleSheet* StyleSheetAt(size_t aIndex) const;
+  size_t SheetCount() const;
+  bool HasStyleSheets() const;
+  void AppendStyleSheetsTo(nsTArray<mozilla::StyleSheet*>& aResult) const;
+
+  nsIStyleRuleProcessor* GetRuleProcessor();
+
+  nsresult FlushSkinSheets();
+
+  nsIAtom* GetBaseTag(int32_t* aNamespaceID);
+  void SetBaseTag(int32_t aNamespaceID, nsIAtom* aTag);
+
+  bool ImplementsInterface(REFNSIID aIID) const;
+
+  nsresult AddResourceListener(nsIContent* aBoundElement);
+
+  void Initialize();
+
+  nsresult ResolveBaseBinding();
+
+  const nsCOMArray<nsXBLKeyEventHandler>* GetKeyEventHandlers()
+  {
+    if (!mKeyHandlersRegistered) {
+      CreateKeyHandlers();
+      mKeyHandlersRegistered = true;
+    }
+
+    return &mKeyHandlers;
+  }
+
+private:
+  nsresult Read(nsIObjectInputStream* aStream,
+                nsXBLDocumentInfo* aDocInfo,
+                nsIDocument* aDocument,
+                uint8_t aFlags);
+
+  /**
+   * Read a new binding from the stream aStream into the xbl document aDocument.
+   * aDocInfo should be the xbl document info for the binding document.
+   * aFlags can contain XBLBinding_Serialize_InheritStyle to indicate that
+   * mInheritStyle flag should be set, and XBLBinding_Serialize_IsFirstBinding
+   * to indicate the first binding in a document.
+   * XBLBinding_Serialize_ChromeOnlyContent indicates that
+   * nsXBLPrototypeBinding::mChromeOnlyContent should be true.
+   * XBLBinding_Serialize_BindToUntrustedContent indicates that
+   * nsXBLPrototypeBinding::mBindToUntrustedContent should be true.
+   */
+public:
+  static nsresult ReadNewBinding(nsIObjectInputStream* aStream,
+                                 nsXBLDocumentInfo* aDocInfo,
+                                 nsIDocument* aDocument,
+                                 uint8_t aFlags);
+
+  /**
+   * Write this binding to the stream.
+   */
+  nsresult Write(nsIObjectOutputStream* aStream);
+
+  /**
+   * Read a content node from aStream and return it in aChild.
+   * aDocument and aNim are the document and node info manager for the document
+   * the child will be inserted into.
+   */
+  nsresult ReadContentNode(nsIObjectInputStream* aStream,
+                           nsIDocument* aDocument,
+                           nsNodeInfoManager* aNim,
+                           nsIContent** aChild);
+
+  /**
+   * Write the content node aNode to aStream.
+   *
+   * This method is called recursively for each child descendant. For the topmost
+   * call, aNode must be an element.
+   *
+   * Text, CDATA and comment nodes are serialized as:
+   *   the constant XBLBinding_Serialize_TextNode, XBLBinding_Serialize_CDATANode
+   *     or XBLBinding_Serialize_CommentNode
+   *   the text for the node
+   * Elements are serialized in the following format:
+   *   node's namespace, written with WriteNamespace
+   *   node's namespace prefix
+   *   node's tag
+   *   32-bit attribute count
+   *   table of attributes:
+   *     attribute's namespace, written with WriteNamespace
+   *     attribute's namespace prefix
+   *     attribute's tag
+   *     attribute's value
+   *   attribute forwarding table:
+   *     source namespace
+   *     source attribute
+   *     destination namespace
+   *     destination attribute
+   *   the constant XBLBinding_Serialize_NoMoreAttributes
+   *   32-bit count of the number of child nodes
+   *     each child node is serialized in the same manner in sequence
+   *   the constant XBLBinding_Serialize_NoContent
+   */
+  nsresult WriteContentNode(nsIObjectOutputStream* aStream, nsIContent* aNode);
+
+  /**
+   * Read or write a namespace id from or to aStream. If the namespace matches
+   * one of the built-in ones defined in nsNameSpaceManager.h, it will be written as
+   * a single byte with that value. Otherwise, XBLBinding_Serialize_CustomNamespace is
+   * written out, followed by a string written with writeWStringZ.
+   */
+  nsresult ReadNamespace(nsIObjectInputStream* aStream, int32_t& aNameSpaceID);
+  nsresult WriteNamespace(nsIObjectOutputStream* aStream, int32_t aNameSpaceID);
+
+public:
+  nsXBLPrototypeBinding();
+  ~nsXBLPrototypeBinding();
+
+  // Init must be called after construction to initialize the prototype
+  // binding.  It may well throw errors (eg on out-of-memory).  Do not confuse
+  // this with the Initialize() method, which must be called after the
+  // binding's handlers, properties, etc are all set.
+  nsresult Init(const nsACString& aRef,
+                nsXBLDocumentInfo* aInfo,
+                nsIContent* aElement,
+                bool aFirstBinding = false);
+
+  void Traverse(nsCycleCollectionTraversalCallback &cb) const;
+  void Unlink();
+  void Trace(const TraceCallbacks& aCallbacks, void *aClosure) const;
+
+// Internal member functions.
+public:
+  /**
+   * GetImmediateChild locates the immediate child of our binding element which
+   * has the localname given by aTag and is in the XBL namespace.
+   */
+  nsIContent* GetImmediateChild(nsIAtom* aTag);
+  nsIContent* LocateInstance(nsIContent* aBoundElt,
+                             nsIContent* aTemplRoot,
+                             nsIContent* aCopyRoot,
+                             nsIContent* aTemplChild);
+
+  bool ChromeOnlyContent() { return mChromeOnlyContent; }
+  bool BindToUntrustedContent() { return mBindToUntrustedContent; }
+
+  typedef nsClassHashtable<nsISupportsHashKey, nsXBLAttributeEntry> InnerAttributeTable;
+
+protected:
+  // Ensure that mAttributeTable has been created.
+  void EnsureAttributeTable();
+  // Ad an entry to the attribute table
+  void AddToAttributeTable(int32_t aSourceNamespaceID, nsIAtom* aSourceTag,
+                           int32_t aDestNamespaceID, nsIAtom* aDestTag,
+                           nsIContent* aContent);
+  void ConstructAttributeTable(nsIContent* aElement);
+  void CreateKeyHandlers();
+
+private:
+  void EnsureResources();
+
+// MEMBER VARIABLES
+protected:
+  nsCOMPtr<nsIURI> mBindingURI;
+  nsCOMPtr<nsIURI> mAlternateBindingURI; // Alternate id-less URI that is only non-null on the first binding.
+  nsCOMPtr<nsIContent> mBinding; // Strong. We own a ref to our content element in the binding doc.
+  nsAutoPtr<nsXBLPrototypeHandler> mPrototypeHandler; // Strong. DocInfo owns us, and we own the handlers.
+
+  // the url of the base binding
+  nsCOMPtr<nsIURI> mBaseBindingURI;
+
+  nsXBLProtoImpl* mImplementation; // Our prototype implementation (includes methods, properties, fields,
+                                   // the constructor, and the destructor).
+
+  // Weak.  The docinfo will own our base binding.
+  mozilla::WeakPtr<nsXBLPrototypeBinding> mBaseBinding;
+  bool mInheritStyle;
+  bool mCheckedBaseProto;
+  bool mKeyHandlersRegistered;
+  bool mChromeOnlyContent;
+  bool mBindToUntrustedContent;
+
+  nsAutoPtr<nsXBLPrototypeResources> mResources; // If we have any resources, this will be non-null.
+
+  nsXBLDocumentInfo* mXBLDocInfoWeak; // A pointer back to our doc info.  Weak, since it owns us.
+
+  // A table for attribute containers. Namespace IDs are used as
+  // keys in the table. Containers are InnerAttributeTables.
+  // This table is used to efficiently handle attribute changes.
+  nsAutoPtr<nsClassHashtable<nsUint32HashKey, InnerAttributeTable>> mAttributeTable;
+
+  class IIDHashKey : public PLDHashEntryHdr
+  {
+  public:
+    typedef const nsIID& KeyType;
+    typedef const nsIID* KeyTypePointer;
+
+    explicit IIDHashKey(const nsIID* aKey)
+      : mKey(*aKey)
+    {}
+    IIDHashKey(const IIDHashKey& aOther)
+      : mKey(aOther.GetKey())
+    {}
+    ~IIDHashKey()
+    {}
+
+    KeyType GetKey() const
+    {
+      return mKey;
+    }
+    bool KeyEquals(const KeyTypePointer aKey) const
+    {
+      return mKey.Equals(*aKey);
+    }
+
+    static KeyTypePointer KeyToPointer(KeyType aKey)
+    {
+      return &aKey;
+    }
+    static PLDHashNumber HashKey(const KeyTypePointer aKey)
+    {
+      // Just use the 32-bit m0 field.
+      return aKey->m0;
+    }
+
+    enum { ALLOW_MEMMOVE = true };
+
+  private:
+    nsIID mKey;
+  };
+  nsInterfaceHashtable<IIDHashKey, nsIContent> mInterfaceTable; // A table of cached interfaces that we support.
+
+  int32_t mBaseNameSpaceID;    // If we extend a tagname/namespace, then that information will
+  nsCOMPtr<nsIAtom> mBaseTag;  // be stored in here.
+
+  nsCOMArray<nsXBLKeyEventHandler> mKeyHandlers;
+};
+
+#endif
diff --git a/dom/xbl/nsXBLPrototypeHandler.cpp b/dom/xbl/nsXBLPrototypeHandler.cpp
new file mode 100644
index 0000000000..2591a72fd9
--- /dev/null
+++ b/dom/xbl/nsXBLPrototypeHandler.cpp
@@ -0,0 +1,1016 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsCOMPtr.h"
+#include "nsQueryObject.h"
+#include "nsXBLPrototypeHandler.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsContentUtils.h"
+#include "nsGlobalWindow.h"
+#include "nsIContent.h"
+#include "nsIAtom.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsIDOMMouseEvent.h"
+#include "nsNameSpaceManager.h"
+#include "nsIDocument.h"
+#include "nsIController.h"
+#include "nsIControllers.h"
+#include "nsIDOMXULElement.h"
+#include "nsIURI.h"
+#include "nsIDOMHTMLTextAreaElement.h"
+#include "nsIDOMHTMLInputElement.h"
+#include "nsFocusManager.h"
+#include "nsIFormControl.h"
+#include "nsIDOMEventListener.h"
+#include "nsPIDOMWindow.h"
+#include "nsPIWindowRoot.h"
+#include "nsIDOMWindow.h"
+#include "nsIServiceManager.h"
+#include "nsIScriptError.h"
+#include "nsXPIDLString.h"
+#include "nsReadableUtils.h"
+#include "nsGkAtoms.h"
+#include "nsIXPConnect.h"
+#include "mozilla/AddonPathService.h"
+#include "nsDOMCID.h"
+#include "nsUnicharUtils.h"
+#include "nsCRT.h"
+#include "nsXBLEventHandler.h"
+#include "nsXBLSerialize.h"
+#include "nsJSUtils.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/JSEventHandler.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/EventHandlerBinding.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "xpcpublic.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+uint32_t nsXBLPrototypeHandler::gRefCnt = 0;
+
+int32_t nsXBLPrototypeHandler::kMenuAccessKey = -1;
+
+const int32_t nsXBLPrototypeHandler::cShift = (1<<0);
+const int32_t nsXBLPrototypeHandler::cAlt = (1<<1);
+const int32_t nsXBLPrototypeHandler::cControl = (1<<2);
+const int32_t nsXBLPrototypeHandler::cMeta = (1<<3);
+const int32_t nsXBLPrototypeHandler::cOS = (1<<4);
+
+const int32_t nsXBLPrototypeHandler::cShiftMask = (1<<5);
+const int32_t nsXBLPrototypeHandler::cAltMask = (1<<6);
+const int32_t nsXBLPrototypeHandler::cControlMask = (1<<7);
+const int32_t nsXBLPrototypeHandler::cMetaMask = (1<<8);
+const int32_t nsXBLPrototypeHandler::cOSMask = (1<<9);
+
+const int32_t nsXBLPrototypeHandler::cAllModifiers =
+  cShiftMask | cAltMask | cControlMask | cMetaMask | cOSMask;
+
+nsXBLPrototypeHandler::nsXBLPrototypeHandler(const char16_t* aEvent,
+                                             const char16_t* aPhase,
+                                             const char16_t* aAction,
+                                             const char16_t* aCommand,
+                                             const char16_t* aKeyCode,
+                                             const char16_t* aCharCode,
+                                             const char16_t* aModifiers,
+                                             const char16_t* aButton,
+                                             const char16_t* aClickCount,
+                                             const char16_t* aGroup,
+                                             const char16_t* aPreventDefault,
+                                             const char16_t* aAllowUntrusted,
+                                             nsXBLPrototypeBinding* aBinding,
+                                             uint32_t aLineNumber)
+  : mHandlerText(nullptr),
+    mLineNumber(aLineNumber),
+    mNextHandler(nullptr),
+    mPrototypeBinding(aBinding)
+{
+  Init();
+
+  ConstructPrototype(nullptr, aEvent, aPhase, aAction, aCommand, aKeyCode,
+                     aCharCode, aModifiers, aButton, aClickCount,
+                     aGroup, aPreventDefault, aAllowUntrusted);
+}
+
+nsXBLPrototypeHandler::nsXBLPrototypeHandler(nsIContent* aHandlerElement)
+  : mHandlerElement(nullptr),
+    mLineNumber(0),
+    mNextHandler(nullptr),
+    mPrototypeBinding(nullptr)
+{
+  Init();
+
+  // Make sure our prototype is initialized.
+  ConstructPrototype(aHandlerElement);
+}
+
+nsXBLPrototypeHandler::nsXBLPrototypeHandler(nsXBLPrototypeBinding* aBinding)
+  : mHandlerText(nullptr),
+    mLineNumber(0),
+    mNextHandler(nullptr),
+    mPrototypeBinding(aBinding)
+{
+  Init();
+}
+
+nsXBLPrototypeHandler::~nsXBLPrototypeHandler()
+{
+  --gRefCnt;
+  if (mType & NS_HANDLER_TYPE_XUL) {
+    NS_IF_RELEASE(mHandlerElement);
+  } else if (mHandlerText) {
+    free(mHandlerText);
+  }
+
+  // We own the next handler in the chain, so delete it now.
+  NS_CONTENT_DELETE_LIST_MEMBER(nsXBLPrototypeHandler, this, mNextHandler);
+}
+
+already_AddRefed<nsIContent>
+nsXBLPrototypeHandler::GetHandlerElement()
+{
+  if (mType & NS_HANDLER_TYPE_XUL) {
+    nsCOMPtr<nsIContent> element = do_QueryReferent(mHandlerElement);
+    return element.forget();
+  }
+
+  return nullptr;
+}
+
+void
+nsXBLPrototypeHandler::AppendHandlerText(const nsAString& aText) 
+{
+  if (mHandlerText) {
+    // Append our text to the existing text.
+    char16_t* temp = mHandlerText;
+    mHandlerText = ToNewUnicode(nsDependentString(temp) + aText);
+    free(temp);
+  }
+  else {
+    mHandlerText = ToNewUnicode(aText);
+  }
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Get the menu access key from prefs.
+// XXX Eventually pick up using CSS3 key-equivalent property or somesuch
+void
+nsXBLPrototypeHandler::InitAccessKeys()
+{
+  if (kMenuAccessKey >= 0) {
+    return;
+  }
+
+  // Compiled-in defaults, in case we can't get the pref --
+  // mac doesn't have menu shortcuts, other platforms use alt.
+#ifdef XP_MACOSX
+  kMenuAccessKey = 0;
+#else
+  kMenuAccessKey = nsIDOMKeyEvent::DOM_VK_ALT;
+#endif
+
+  // Get the menu access key value from prefs, overriding the default:
+  kMenuAccessKey =
+    Preferences::GetInt("ui.key.menuAccessKey", kMenuAccessKey);
+}
+
+nsresult
+nsXBLPrototypeHandler::ExecuteHandler(EventTarget* aTarget,
+                                      nsIDOMEvent* aEvent)
+{
+  nsresult rv = NS_ERROR_FAILURE;
+
+  // Prevent default action?
+  if (mType & NS_HANDLER_TYPE_PREVENTDEFAULT) {
+    aEvent->PreventDefault();
+    // If we prevent default, then it's okay for
+    // mHandlerElement and mHandlerText to be null
+    rv = NS_OK;
+  }
+
+  if (!mHandlerElement) // This works for both types of handlers.  In both cases, the union's var should be defined.
+    return rv;
+
+  // See if our event receiver is a content node (and not us).
+  bool isXULKey = !!(mType & NS_HANDLER_TYPE_XUL);
+  bool isXBLCommand = !!(mType & NS_HANDLER_TYPE_XBL_COMMAND);
+  NS_ASSERTION(!(isXULKey && isXBLCommand),
+               "can't be both a key and xbl command handler");
+
+  // XUL handlers and commands shouldn't be triggered by non-trusted
+  // events.
+  if (isXULKey || isXBLCommand) {
+    bool trustedEvent = false;
+    aEvent->GetIsTrusted(&trustedEvent);
+
+    if (!trustedEvent)
+      return NS_OK;
+  }
+    
+  if (isXBLCommand) {
+    return DispatchXBLCommand(aTarget, aEvent);
+  }
+
+  // If we're executing on a XUL key element, just dispatch a command
+  // event at the element.  It will take care of retargeting it to its
+  // command element, if applicable, and executing the event handler.
+  if (isXULKey) {
+    return DispatchXULKeyCommand(aEvent);
+  }
+
+  // Look for a compiled handler on the element. 
+  // Should be compiled and bound with "on" in front of the name.
+  nsCOMPtr<nsIAtom> onEventAtom = NS_Atomize(NS_LITERAL_STRING("onxbl") +
+                                             nsDependentAtomString(mEventName));
+
+  // Compile the handler and bind it to the element.
+  nsCOMPtr<nsIScriptGlobalObject> boundGlobal;
+  nsCOMPtr<nsPIWindowRoot> winRoot = do_QueryInterface(aTarget);
+  if (winRoot) {
+    if (nsCOMPtr<nsPIDOMWindowOuter> window = winRoot->GetWindow()) {
+      nsPIDOMWindowInner* innerWindow = window->GetCurrentInnerWindow();
+      NS_ENSURE_TRUE(innerWindow, NS_ERROR_UNEXPECTED);
+
+      boundGlobal = do_QueryInterface(innerWindow->GetPrivateRoot());
+    }
+  }
+  else boundGlobal = do_QueryInterface(aTarget);
+
+  if (!boundGlobal) {
+    nsCOMPtr<nsIDocument> boundDocument(do_QueryInterface(aTarget));
+    if (!boundDocument) {
+      // We must be an element.
+      nsCOMPtr<nsIContent> content(do_QueryInterface(aTarget));
+      if (!content)
+        return NS_OK;
+      boundDocument = content->OwnerDoc();
+    }
+
+    boundGlobal = do_QueryInterface(boundDocument->GetScopeObject());
+  }
+
+  if (!boundGlobal)
+    return NS_OK;
+
+  nsISupports *scriptTarget;
+
+  if (winRoot) {
+    scriptTarget = boundGlobal;
+  } else {
+    scriptTarget = aTarget;
+  }
+
+  // We're about to create a new JSEventHandler, which means that we need to
+  // Initiatize an AutoJSAPI with aTarget's bound global to make sure any errors
+  // are reported to the correct place.
+  AutoJSAPI jsapi;
+  if (NS_WARN_IF(!jsapi.Init(boundGlobal))) {
+    return NS_OK;
+  }
+  JSContext* cx = jsapi.cx();
+  JS::Rooted<JSObject*> handler(cx);
+
+  rv = EnsureEventHandler(jsapi, onEventAtom, &handler);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  JSAddonId* addonId = MapURIToAddonID(mPrototypeBinding->DocURI());
+
+  JS::Rooted<JSObject*> globalObject(cx, boundGlobal->GetGlobalJSObject());
+  JS::Rooted<JSObject*> scopeObject(cx, xpc::GetScopeForXBLExecution(cx, globalObject, addonId));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+
+  // Bind it to the bound element. Note that if we're using a separate XBL scope,
+  // we'll actually be binding the event handler to a cross-compartment wrapper
+  // to the bound element's reflector.
+
+  // First, enter our XBL scope. This is where the generic handler should have
+  // been compiled, above.
+  JSAutoCompartment ac(cx, scopeObject);
+  JS::Rooted<JSObject*> genericHandler(cx, handler.get());
+  bool ok = JS_WrapObject(cx, &genericHandler);
+  NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
+  MOZ_ASSERT(!js::IsCrossCompartmentWrapper(genericHandler));
+
+  // Build a scope chain in the XBL scope.
+  RefPtr<Element> targetElement = do_QueryObject(scriptTarget);
+  JS::AutoObjectVector scopeChain(cx);
+  ok = nsJSUtils::GetScopeChainForElement(cx, targetElement, scopeChain);
+  NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
+
+  // Next, clone the generic handler with our desired scope chain.
+  JS::Rooted<JSObject*> bound(cx, JS::CloneFunctionObject(cx, genericHandler,
+                                                          scopeChain));
+  NS_ENSURE_TRUE(bound, NS_ERROR_FAILURE);
+
+  RefPtr<EventHandlerNonNull> handlerCallback =
+    new EventHandlerNonNull(nullptr, bound, /* aIncumbentGlobal = */ nullptr);
+
+  TypedEventHandler typedHandler(handlerCallback);
+
+  // Execute it.
+  nsCOMPtr<JSEventHandler> jsEventHandler;
+  rv = NS_NewJSEventHandler(scriptTarget, onEventAtom,
+                            typedHandler,
+                            getter_AddRefs(jsEventHandler));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Handle the event.
+  jsEventHandler->HandleEvent(aEvent);
+  jsEventHandler->Disconnect();
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeHandler::EnsureEventHandler(AutoJSAPI& jsapi, nsIAtom* aName,
+                                          JS::MutableHandle<JSObject*> aHandler)
+{
+  JSContext* cx = jsapi.cx();
+
+  // Check to see if we've already compiled this
+  JS::Rooted<JSObject*> globalObject(cx, JS::CurrentGlobalOrNull(cx));
+  nsCOMPtr<nsPIDOMWindowInner> pWindow = xpc::WindowOrNull(globalObject)->AsInner();
+  if (pWindow) {
+    JS::Rooted<JSObject*> cachedHandler(cx, pWindow->GetCachedXBLPrototypeHandler(this));
+    if (cachedHandler) {
+      JS::ExposeObjectToActiveJS(cachedHandler);
+      aHandler.set(cachedHandler);
+      NS_ENSURE_TRUE(aHandler, NS_ERROR_FAILURE);
+      return NS_OK;
+    }
+  }
+
+  // Ensure that we have something to compile
+  nsDependentString handlerText(mHandlerText);
+  NS_ENSURE_TRUE(!handlerText.IsEmpty(), NS_ERROR_FAILURE);
+
+  JSAddonId* addonId = MapURIToAddonID(mPrototypeBinding->DocURI());
+
+  JS::Rooted<JSObject*> scopeObject(cx, xpc::GetScopeForXBLExecution(cx, globalObject, addonId));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+
+  nsAutoCString bindingURI;
+  nsresult rv = mPrototypeBinding->DocURI()->GetSpec(bindingURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t argCount;
+  const char **argNames;
+  nsContentUtils::GetEventArgNames(kNameSpaceID_XBL, aName, false, &argCount,
+                                   &argNames);
+
+  // Compile the event handler in the xbl scope.
+  JSAutoCompartment ac(cx, scopeObject);
+  JS::CompileOptions options(cx);
+  options.setFileAndLine(bindingURI.get(), mLineNumber)
+         .setVersion(JSVERSION_LATEST);
+
+  JS::Rooted<JSObject*> handlerFun(cx);
+  JS::AutoObjectVector emptyVector(cx);
+  rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options,
+                                  nsAtomCString(aName), argCount,
+                                  argNames, handlerText,
+                                  handlerFun.address());
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(handlerFun, NS_ERROR_FAILURE);
+
+  // Wrap the handler into the content scope, since we're about to stash it
+  // on the DOM window and such.
+  JSAutoCompartment ac2(cx, globalObject);
+  bool ok = JS_WrapObject(cx, &handlerFun);
+  NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
+  aHandler.set(handlerFun);
+  NS_ENSURE_TRUE(aHandler, NS_ERROR_FAILURE);
+
+  if (pWindow) {
+    pWindow->CacheXBLPrototypeHandler(this, aHandler);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeHandler::DispatchXBLCommand(EventTarget* aTarget, nsIDOMEvent* aEvent)
+{
+  // This is a special-case optimization to make command handling fast.
+  // It isn't really a part of XBL, but it helps speed things up.
+
+  if (aEvent) {
+    // See if preventDefault has been set.  If so, don't execute.
+    bool preventDefault = false;
+    aEvent->GetDefaultPrevented(&preventDefault);
+    if (preventDefault) {
+      return NS_OK;
+    }
+    bool dispatchStopped = aEvent->IsDispatchStopped();
+    if (dispatchStopped) {
+      return NS_OK;
+    }
+  }
+
+  // Instead of executing JS, let's get the controller for the bound
+  // element and call doCommand on it.
+  nsCOMPtr<nsIController> controller;
+
+  nsCOMPtr<nsPIDOMWindowOuter> privateWindow;
+  nsCOMPtr<nsPIWindowRoot> windowRoot = do_QueryInterface(aTarget);
+  if (windowRoot) {
+    privateWindow = windowRoot->GetWindow();
+  }
+  else {
+    privateWindow = do_QueryInterface(aTarget);
+    if (!privateWindow) {
+      nsCOMPtr<nsIContent> elt(do_QueryInterface(aTarget));
+      nsCOMPtr<nsIDocument> doc;
+      // XXXbz sXBL/XBL2 issue -- this should be the "scope doc" or
+      // something... whatever we use when wrapping DOM nodes
+      // normally.  It's not clear that the owner doc is the right
+      // thing.
+      if (elt)
+        doc = elt->OwnerDoc();
+
+      if (!doc)
+        doc = do_QueryInterface(aTarget);
+
+      if (!doc)
+        return NS_ERROR_FAILURE;
+
+      privateWindow = doc->GetWindow();
+      if (!privateWindow)
+        return NS_ERROR_FAILURE;
+    }
+
+    windowRoot = privateWindow->GetTopWindowRoot();
+  }
+
+  NS_LossyConvertUTF16toASCII command(mHandlerText);
+  if (windowRoot)
+    windowRoot->GetControllerForCommand(command.get(), getter_AddRefs(controller));
+  else
+    controller = GetController(aTarget); // We're attached to the receiver possibly.
+
+  // We are the default action for this command.
+  // Stop any other default action from executing.
+  aEvent->PreventDefault();
+
+  if (mEventName == nsGkAtoms::keypress &&
+      mDetail == nsIDOMKeyEvent::DOM_VK_SPACE &&
+      mMisc == 1) {
+    // get the focused element so that we can pageDown only at
+    // certain times.
+
+    nsCOMPtr<nsPIDOMWindowOuter> windowToCheck;
+    if (windowRoot)
+      windowToCheck = windowRoot->GetWindow();
+    else
+      windowToCheck = privateWindow->GetPrivateRoot();
+
+    nsCOMPtr<nsIContent> focusedContent;
+    if (windowToCheck) {
+      nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
+      focusedContent =
+        nsFocusManager::GetFocusedDescendant(windowToCheck, true, getter_AddRefs(focusedWindow));
+    }
+
+    // If the focus is in an editable region, don't scroll.
+    if (focusedContent && focusedContent->IsEditable()) {
+      return NS_OK;
+    }
+
+    // If the focus is in a form control, don't scroll.
+    for (nsIContent* c = focusedContent; c; c = c->GetParent()) {
+      nsCOMPtr<nsIFormControl> formControl = do_QueryInterface(c);
+      if (formControl) {
+        return NS_OK;
+      }
+    }
+  }
+  
+  if (controller)
+    controller->DoCommand(command.get());
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeHandler::DispatchXULKeyCommand(nsIDOMEvent* aEvent)
+{
+  nsCOMPtr<nsIContent> handlerElement = GetHandlerElement();
+  NS_ENSURE_STATE(handlerElement);
+  if (handlerElement->AttrValueIs(kNameSpaceID_None,
+                                  nsGkAtoms::disabled,
+                                  nsGkAtoms::_true,
+                                  eCaseMatters)) {
+    // Don't dispatch command events for disabled keys.
+    return NS_OK;
+  }
+
+  aEvent->PreventDefault();
+
+  // Copy the modifiers from the key event.
+  nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aEvent);
+  if (!keyEvent) {
+    NS_ERROR("Trying to execute a key handler for a non-key event!");
+    return NS_ERROR_FAILURE;
+  }
+
+  // XXX We should use mozilla::Modifiers for supporting all modifiers.
+
+  bool isAlt = false;
+  bool isControl = false;
+  bool isShift = false;
+  bool isMeta = false;
+  keyEvent->GetAltKey(&isAlt);
+  keyEvent->GetCtrlKey(&isControl);
+  keyEvent->GetShiftKey(&isShift);
+  keyEvent->GetMetaKey(&isMeta);
+
+  nsContentUtils::DispatchXULCommand(handlerElement, true,
+                                     nullptr, nullptr,
+                                     isControl, isAlt, isShift, isMeta);
+  return NS_OK;
+}
+
+already_AddRefed<nsIAtom>
+nsXBLPrototypeHandler::GetEventName()
+{
+  nsCOMPtr<nsIAtom> eventName = mEventName;
+  return eventName.forget();
+}
+
+already_AddRefed<nsIController>
+nsXBLPrototypeHandler::GetController(EventTarget* aTarget)
+{
+  // XXX Fix this so there's a generic interface that describes controllers,
+  // This code should have no special knowledge of what objects might have controllers.
+  nsCOMPtr<nsIControllers> controllers;
+
+  nsCOMPtr<nsIDOMXULElement> xulElement(do_QueryInterface(aTarget));
+  if (xulElement)
+    xulElement->GetControllers(getter_AddRefs(controllers));
+
+  if (!controllers) {
+    nsCOMPtr<nsIDOMHTMLTextAreaElement> htmlTextArea(do_QueryInterface(aTarget));
+    if (htmlTextArea)
+      htmlTextArea->GetControllers(getter_AddRefs(controllers));
+  }
+
+  if (!controllers) {
+    nsCOMPtr<nsIDOMHTMLInputElement> htmlInputElement(do_QueryInterface(aTarget));
+    if (htmlInputElement)
+      htmlInputElement->GetControllers(getter_AddRefs(controllers));
+  }
+
+  if (!controllers) {
+    nsCOMPtr<nsPIDOMWindowOuter> domWindow(do_QueryInterface(aTarget));
+    if (domWindow) {
+      domWindow->GetControllers(getter_AddRefs(controllers));
+    }
+  }
+
+  // Return the first controller.
+  // XXX This code should be checking the command name and using supportscommand and
+  // iscommandenabled.
+  nsCOMPtr<nsIController> controller;
+  if (controllers) {
+    controllers->GetControllerAt(0, getter_AddRefs(controller));
+  }
+
+  return controller.forget();
+}
+
+bool
+nsXBLPrototypeHandler::KeyEventMatched(
+                         nsIDOMKeyEvent* aKeyEvent,
+                         uint32_t aCharCode,
+                         const IgnoreModifierState& aIgnoreModifierState)
+{
+  if (mDetail != -1) {
+    // Get the keycode or charcode of the key event.
+    uint32_t code;
+
+    if (mMisc) {
+      if (aCharCode)
+        code = aCharCode;
+      else
+        aKeyEvent->GetCharCode(&code);
+      if (IS_IN_BMP(code))
+        code = ToLowerCase(char16_t(code));
+    }
+    else
+      aKeyEvent->GetKeyCode(&code);
+
+    if (code != uint32_t(mDetail))
+      return false;
+  }
+
+  return ModifiersMatchMask(aKeyEvent, aIgnoreModifierState);
+}
+
+bool
+nsXBLPrototypeHandler::MouseEventMatched(nsIDOMMouseEvent* aMouseEvent)
+{
+  if (mDetail == -1 && mMisc == 0 && (mKeyMask & cAllModifiers) == 0)
+    return true; // No filters set up. It's generic.
+
+  int16_t button;
+  aMouseEvent->GetButton(&button);
+  if (mDetail != -1 && (button != mDetail))
+    return false;
+
+  int32_t clickcount;
+  aMouseEvent->GetDetail(&clickcount);
+  if (mMisc != 0 && (clickcount != mMisc))
+    return false;
+
+  return ModifiersMatchMask(aMouseEvent, IgnoreModifierState());
+}
+
+struct keyCodeData {
+  const char* str;
+  uint16_t strlength;
+  uint16_t keycode;
+};
+
+// All of these must be uppercase, since the function below does
+// case-insensitive comparison by converting to uppercase.
+// XXX: be sure to check this periodically for new symbol additions!
+static const keyCodeData gKeyCodes[] = {
+
+#define NS_DEFINE_VK(aDOMKeyName, aDOMKeyCode) \
+  { #aDOMKeyName, sizeof(#aDOMKeyName) - 1, aDOMKeyCode },
+#include "mozilla/VirtualKeyCodeList.h"
+#undef NS_DEFINE_VK
+
+  { nullptr, 0, 0 }
+};
+
+int32_t nsXBLPrototypeHandler::GetMatchingKeyCode(const nsAString& aKeyName)
+{
+  nsAutoCString keyName;
+  keyName.AssignWithConversion(aKeyName);
+  ToUpperCase(keyName); // We want case-insensitive comparison with data
+                        // stored as uppercase.
+
+  uint32_t keyNameLength = keyName.Length();
+  const char* keyNameStr = keyName.get();
+  for (uint16_t i = 0; i < ArrayLength(gKeyCodes) - 1; ++i) {
+    if (keyNameLength == gKeyCodes[i].strlength &&
+        !nsCRT::strcmp(gKeyCodes[i].str, keyNameStr)) {
+      return gKeyCodes[i].keycode;
+    }
+  }
+
+  return 0;
+}
+
+int32_t nsXBLPrototypeHandler::KeyToMask(int32_t key)
+{
+  switch (key)
+  {
+    case nsIDOMKeyEvent::DOM_VK_META:
+      return cMeta | cMetaMask;
+
+    case nsIDOMKeyEvent::DOM_VK_WIN:
+      return cOS | cOSMask;
+
+    case nsIDOMKeyEvent::DOM_VK_ALT:
+      return cAlt | cAltMask;
+
+    case nsIDOMKeyEvent::DOM_VK_CONTROL:
+    default:
+      return cControl | cControlMask;
+  }
+  return cControl | cControlMask;  // for warning avoidance
+}
+
+// static
+int32_t
+nsXBLPrototypeHandler::AccelKeyMask()
+{
+  switch (WidgetInputEvent::AccelModifier()) {
+    case MODIFIER_ALT:
+      return KeyToMask(nsIDOMKeyEvent::DOM_VK_ALT);
+    case MODIFIER_CONTROL:
+      return KeyToMask(nsIDOMKeyEvent::DOM_VK_CONTROL);
+    case MODIFIER_META:
+      return KeyToMask(nsIDOMKeyEvent::DOM_VK_META);
+    case MODIFIER_OS:
+      return KeyToMask(nsIDOMKeyEvent::DOM_VK_WIN);
+    default:
+      MOZ_CRASH("Handle the new result of WidgetInputEvent::AccelModifier()");
+      return 0;
+  }
+}
+
+void
+nsXBLPrototypeHandler::GetEventType(nsAString& aEvent)
+{
+  nsCOMPtr<nsIContent> handlerElement = GetHandlerElement();
+  if (!handlerElement) {
+    aEvent.Truncate();
+    return;
+  }
+  handlerElement->GetAttr(kNameSpaceID_None, nsGkAtoms::event, aEvent);
+  
+  if (aEvent.IsEmpty() && (mType & NS_HANDLER_TYPE_XUL))
+    // If no type is specified for a XUL <key> element, let's assume that we're "keypress".
+    aEvent.AssignLiteral("keypress");
+}
+
+void
+nsXBLPrototypeHandler::ConstructPrototype(nsIContent* aKeyElement, 
+                                          const char16_t* aEvent,
+                                          const char16_t* aPhase,
+                                          const char16_t* aAction,
+                                          const char16_t* aCommand,
+                                          const char16_t* aKeyCode,
+                                          const char16_t* aCharCode,
+                                          const char16_t* aModifiers,
+                                          const char16_t* aButton,
+                                          const char16_t* aClickCount,
+                                          const char16_t* aGroup,
+                                          const char16_t* aPreventDefault,
+                                          const char16_t* aAllowUntrusted)
+{
+  mType = 0;
+
+  if (aKeyElement) {
+    mType |= NS_HANDLER_TYPE_XUL;
+    MOZ_ASSERT(!mPrototypeBinding);
+    nsCOMPtr<nsIWeakReference> weak = do_GetWeakReference(aKeyElement);
+    if (!weak) {
+      return;
+    }
+    weak.swap(mHandlerElement);
+  }
+  else {
+    mType |= aCommand ? NS_HANDLER_TYPE_XBL_COMMAND : NS_HANDLER_TYPE_XBL_JS;
+    mHandlerText = nullptr;
+  }
+
+  mDetail = -1;
+  mMisc = 0;
+  mKeyMask = 0;
+  mPhase = NS_PHASE_BUBBLING;
+
+  if (aAction)
+    mHandlerText = ToNewUnicode(nsDependentString(aAction));
+  else if (aCommand)
+    mHandlerText = ToNewUnicode(nsDependentString(aCommand));
+
+  nsAutoString event(aEvent);
+  if (event.IsEmpty()) {
+    if (mType & NS_HANDLER_TYPE_XUL)
+      GetEventType(event);
+    if (event.IsEmpty())
+      return;
+  }
+
+  mEventName = NS_Atomize(event);
+
+  if (aPhase) {
+    const nsDependentString phase(aPhase);
+    if (phase.EqualsLiteral("capturing"))
+      mPhase = NS_PHASE_CAPTURING;
+    else if (phase.EqualsLiteral("target"))
+      mPhase = NS_PHASE_TARGET;
+  }
+
+  // Button and clickcount apply only to XBL handlers and don't apply to XUL key
+  // handlers.  
+  if (aButton && *aButton)
+    mDetail = *aButton - '0';
+
+  if (aClickCount && *aClickCount)
+    mMisc = *aClickCount - '0';
+
+  // Modifiers are supported by both types of handlers (XUL and XBL).  
+  nsAutoString modifiers(aModifiers);
+  if (mType & NS_HANDLER_TYPE_XUL)
+    aKeyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::modifiers, modifiers);
+  
+  if (!modifiers.IsEmpty()) {
+    mKeyMask = cAllModifiers;
+    char* str = ToNewCString(modifiers);
+    char* newStr;
+    char* token = nsCRT::strtok( str, ", \t", &newStr );
+    while( token != nullptr ) {
+      if (PL_strcmp(token, "shift") == 0)
+        mKeyMask |= cShift | cShiftMask;
+      else if (PL_strcmp(token, "alt") == 0)
+        mKeyMask |= cAlt | cAltMask;
+      else if (PL_strcmp(token, "meta") == 0)
+        mKeyMask |= cMeta | cMetaMask;
+      else if (PL_strcmp(token, "os") == 0)
+        mKeyMask |= cOS | cOSMask;
+      else if (PL_strcmp(token, "control") == 0)
+        mKeyMask |= cControl | cControlMask;
+      else if (PL_strcmp(token, "accel") == 0)
+        mKeyMask |= AccelKeyMask();
+      else if (PL_strcmp(token, "access") == 0)
+        mKeyMask |= KeyToMask(kMenuAccessKey);
+      else if (PL_strcmp(token, "any") == 0)
+        mKeyMask &= ~(mKeyMask << 5);
+    
+      token = nsCRT::strtok( newStr, ", \t", &newStr );
+    }
+
+    free(str);
+  }
+
+  nsAutoString key(aCharCode);
+  if (key.IsEmpty()) {
+    if (mType & NS_HANDLER_TYPE_XUL) {
+      aKeyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::key, key);
+      if (key.IsEmpty()) 
+        aKeyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::charcode, key);
+    }
+  }
+
+  if (!key.IsEmpty()) {
+    if (mKeyMask == 0)
+      mKeyMask = cAllModifiers;
+    ToLowerCase(key);
+
+    // We have a charcode.
+    mMisc = 1;
+    mDetail = key[0];
+    const uint8_t GTK2Modifiers = cShift | cControl | cShiftMask | cControlMask;
+    if ((mType & NS_HANDLER_TYPE_XUL) &&
+        (mKeyMask & GTK2Modifiers) == GTK2Modifiers &&
+        modifiers.First() != char16_t(',') &&
+        (mDetail == 'u' || mDetail == 'U'))
+      ReportKeyConflict(key.get(), modifiers.get(), aKeyElement, "GTK2Conflict2");
+    const uint8_t WinModifiers = cControl | cAlt | cControlMask | cAltMask;
+    if ((mType & NS_HANDLER_TYPE_XUL) &&
+        (mKeyMask & WinModifiers) == WinModifiers &&
+        modifiers.First() != char16_t(',') &&
+        (('A' <= mDetail && mDetail <= 'Z') ||
+         ('a' <= mDetail && mDetail <= 'z')))
+      ReportKeyConflict(key.get(), modifiers.get(), aKeyElement, "WinConflict2");
+  }
+  else {
+    key.Assign(aKeyCode);
+    if (mType & NS_HANDLER_TYPE_XUL)
+      aKeyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::keycode, key);
+    
+    if (!key.IsEmpty()) {
+      if (mKeyMask == 0)
+        mKeyMask = cAllModifiers;
+      mDetail = GetMatchingKeyCode(key);
+    }
+  }
+
+  if (aGroup && nsDependentString(aGroup).EqualsLiteral("system"))
+    mType |= NS_HANDLER_TYPE_SYSTEM;
+
+  if (aPreventDefault &&
+      nsDependentString(aPreventDefault).EqualsLiteral("true"))
+    mType |= NS_HANDLER_TYPE_PREVENTDEFAULT;
+
+  if (aAllowUntrusted) {
+    mType |= NS_HANDLER_HAS_ALLOW_UNTRUSTED_ATTR;
+    if (nsDependentString(aAllowUntrusted).EqualsLiteral("true")) {
+      mType |= NS_HANDLER_ALLOW_UNTRUSTED;
+    } else {
+      mType &= ~NS_HANDLER_ALLOW_UNTRUSTED;
+    }
+  }
+}
+
+void
+nsXBLPrototypeHandler::ReportKeyConflict(const char16_t* aKey, const char16_t* aModifiers, nsIContent* aKeyElement, const char *aMessageName)
+{
+  nsCOMPtr<nsIDocument> doc;
+  if (mPrototypeBinding) {
+    nsXBLDocumentInfo* docInfo = mPrototypeBinding->XBLDocumentInfo();
+    if (docInfo) {
+      doc = docInfo->GetDocument();
+    }
+  } else {
+    doc = aKeyElement->OwnerDoc();
+  }
+
+  nsAutoString id;
+  aKeyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::id, id);
+  const char16_t* params[] = { aKey, aModifiers, id.get() };
+  nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                  NS_LITERAL_CSTRING("XBL Prototype Handler"), doc,
+                                  nsContentUtils::eXBL_PROPERTIES,
+                                  aMessageName,
+                                  params, ArrayLength(params),
+                                  nullptr, EmptyString(), mLineNumber);
+}
+
+bool
+nsXBLPrototypeHandler::ModifiersMatchMask(
+                         nsIDOMUIEvent* aEvent,
+                         const IgnoreModifierState& aIgnoreModifierState)
+{
+  WidgetInputEvent* inputEvent = aEvent->AsEvent()->WidgetEventPtr()->AsInputEvent();
+  NS_ENSURE_TRUE(inputEvent, false);
+
+  if (mKeyMask & cMetaMask) {
+    if (inputEvent->IsMeta() != ((mKeyMask & cMeta) != 0)) {
+      return false;
+    }
+  }
+
+  if ((mKeyMask & cOSMask) && !aIgnoreModifierState.mOS) {
+    if (inputEvent->IsOS() != ((mKeyMask & cOS) != 0)) {
+      return false;
+    }
+  }
+
+  if (mKeyMask & cShiftMask && !aIgnoreModifierState.mShift) {
+    if (inputEvent->IsShift() != ((mKeyMask & cShift) != 0)) {
+      return false;
+    }
+  }
+
+  if (mKeyMask & cAltMask) {
+    if (inputEvent->IsAlt() != ((mKeyMask & cAlt) != 0)) {
+      return false;
+    }
+  }
+
+  if (mKeyMask & cControlMask) {
+    if (inputEvent->IsControl() != ((mKeyMask & cControl) != 0)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+nsresult
+nsXBLPrototypeHandler::Read(nsIObjectInputStream* aStream)
+{
+  AssertInCompilationScope();
+  nsresult rv = aStream->Read8(&mPhase);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Read8(&mType);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Read8(&mMisc);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aStream->Read32(reinterpret_cast<uint32_t*>(&mKeyMask));
+  NS_ENSURE_SUCCESS(rv, rv);
+  uint32_t detail; 
+  rv = aStream->Read32(&detail);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mDetail = detail;
+
+  nsAutoString name;
+  rv = aStream->ReadString(name);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mEventName = NS_Atomize(name);
+
+  rv = aStream->Read32(&mLineNumber);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoString handlerText;
+  rv = aStream->ReadString(handlerText);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!handlerText.IsEmpty())
+    mHandlerText = ToNewUnicode(handlerText);
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeHandler::Write(nsIObjectOutputStream* aStream)
+{
+  AssertInCompilationScope();
+  // Make sure we don't write out NS_HANDLER_TYPE_XUL types, as they are used
+  // for <keyset> elements.
+  if ((mType & NS_HANDLER_TYPE_XUL) || !mEventName)
+    return NS_OK;
+
+  XBLBindingSerializeDetails type = XBLBinding_Serialize_Handler;
+
+  nsresult rv = aStream->Write8(type);
+  rv = aStream->Write8(mPhase);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Write8(mType);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Write8(mMisc);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Write32(static_cast<uint32_t>(mKeyMask));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aStream->Write32(mDetail);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aStream->WriteWStringZ(nsDependentAtomString(mEventName).get());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aStream->Write32(mLineNumber);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return aStream->WriteWStringZ(mHandlerText ? mHandlerText : u"");
+}
diff --git a/dom/xbl/nsXBLPrototypeHandler.h b/dom/xbl/nsXBLPrototypeHandler.h
new file mode 100644
index 0000000000..6898b73ede
--- /dev/null
+++ b/dom/xbl/nsXBLPrototypeHandler.h
@@ -0,0 +1,243 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLPrototypeHandler_h__
+#define nsXBLPrototypeHandler_h__
+
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "nsCOMPtr.h"
+#include "nsIController.h"
+#include "nsAutoPtr.h"
+#include "nsXBLEventHandler.h"
+#include "nsIWeakReference.h"
+#include "nsCycleCollectionParticipant.h"
+#include "js/TypeDecls.h"
+
+class nsIDOMEvent;
+class nsIContent;
+class nsIDOMUIEvent;
+class nsIDOMKeyEvent;
+class nsIDOMMouseEvent;
+class nsIObjectInputStream;
+class nsIObjectOutputStream;
+class nsXBLPrototypeBinding;
+
+namespace mozilla {
+namespace dom {
+class AutoJSAPI;
+class EventTarget;
+} // namespace dom
+} // namespace mozilla
+
+#define NS_HANDLER_TYPE_XBL_JS              (1 << 0)
+#define NS_HANDLER_TYPE_XBL_COMMAND         (1 << 1)
+#define NS_HANDLER_TYPE_XUL                 (1 << 2)
+#define NS_HANDLER_HAS_ALLOW_UNTRUSTED_ATTR (1 << 4)
+#define NS_HANDLER_ALLOW_UNTRUSTED          (1 << 5)
+#define NS_HANDLER_TYPE_SYSTEM              (1 << 6)
+#define NS_HANDLER_TYPE_PREVENTDEFAULT      (1 << 7)
+
+// XXX Use nsIDOMEvent:: codes?
+#define NS_PHASE_CAPTURING          1
+#define NS_PHASE_TARGET             2
+#define NS_PHASE_BUBBLING           3
+
+namespace mozilla {
+namespace dom {
+
+struct IgnoreModifierState
+{
+  // When mShift is true, Shift key state will be ignored.
+  bool mShift;
+  // When mOS is true, OS key state will be ignored.
+  bool mOS;
+
+  IgnoreModifierState()
+    : mShift(false)
+    , mOS(false)
+  {
+  }
+};
+
+} // namespace dom
+} // namespace mozilla
+
+class nsXBLPrototypeHandler
+{
+  typedef mozilla::dom::IgnoreModifierState IgnoreModifierState;
+
+public:
+  // This constructor is used by XBL handlers (both the JS and command shorthand variety)
+  nsXBLPrototypeHandler(const char16_t* aEvent, const char16_t* aPhase,
+                        const char16_t* aAction, const char16_t* aCommand,
+                        const char16_t* aKeyCode, const char16_t* aCharCode,
+                        const char16_t* aModifiers, const char16_t* aButton,
+                        const char16_t* aClickCount, const char16_t* aGroup,
+                        const char16_t* aPreventDefault,
+                        const char16_t* aAllowUntrusted,
+                        nsXBLPrototypeBinding* aBinding,
+                        uint32_t aLineNumber);
+
+  // This constructor is used only by XUL key handlers (e.g., <key>)
+  explicit nsXBLPrototypeHandler(nsIContent* aKeyElement);
+
+  // This constructor is used for handlers loaded from the cache
+  explicit nsXBLPrototypeHandler(nsXBLPrototypeBinding* aBinding);
+
+  ~nsXBLPrototypeHandler();
+
+  bool EventTypeEquals(nsIAtom* aEventType) const
+  {
+    return mEventName == aEventType;
+  }
+
+  // if aCharCode is not zero, it is used instead of the charCode of aKeyEvent.
+  bool KeyEventMatched(nsIDOMKeyEvent* aKeyEvent,
+                       uint32_t aCharCode,
+                       const IgnoreModifierState& aIgnoreModifierState);
+
+  bool MouseEventMatched(nsIDOMMouseEvent* aMouseEvent);
+  inline bool MouseEventMatched(nsIAtom* aEventType,
+                                  nsIDOMMouseEvent* aEvent)
+  {
+    if (!EventTypeEquals(aEventType)) {
+      return false;
+    }
+    return MouseEventMatched(aEvent);
+  }
+
+  already_AddRefed<nsIContent> GetHandlerElement();
+
+  void AppendHandlerText(const nsAString& aText);
+
+  uint8_t GetPhase() { return mPhase; }
+  uint8_t GetType() { return mType; }
+
+  nsXBLPrototypeHandler* GetNextHandler() { return mNextHandler; }
+  void SetNextHandler(nsXBLPrototypeHandler* aHandler) { mNextHandler = aHandler; }
+
+  nsresult ExecuteHandler(mozilla::dom::EventTarget* aTarget, nsIDOMEvent* aEvent);
+
+  already_AddRefed<nsIAtom> GetEventName();
+  void SetEventName(nsIAtom* aName) { mEventName = aName; }
+
+  nsXBLEventHandler* GetEventHandler()
+  {
+    if (!mHandler) {
+      mHandler = NS_NewXBLEventHandler(this, mEventName);
+    }
+
+    return mHandler;
+  }
+
+  nsXBLEventHandler* GetCachedEventHandler()
+  {
+    return mHandler;
+  }
+
+  bool HasAllowUntrustedAttr()
+  {
+    return (mType & NS_HANDLER_HAS_ALLOW_UNTRUSTED_ATTR) != 0;
+  }
+
+  // This returns a valid value only if HasAllowUntrustedEventsAttr returns
+  // true.
+  bool AllowUntrustedEvents()
+  {
+    return (mType & NS_HANDLER_ALLOW_UNTRUSTED) != 0;
+  }
+
+  nsresult Read(nsIObjectInputStream* aStream);
+  nsresult Write(nsIObjectOutputStream* aStream);
+
+public:
+  static uint32_t gRefCnt;
+
+protected:
+  void Init() {
+    ++gRefCnt;
+    if (gRefCnt == 1)
+      // Get the primary accelerator key.
+      InitAccessKeys();
+  }
+
+  already_AddRefed<nsIController> GetController(mozilla::dom::EventTarget* aTarget);
+
+  inline int32_t GetMatchingKeyCode(const nsAString& aKeyName);
+  void ConstructPrototype(nsIContent* aKeyElement,
+                          const char16_t* aEvent=nullptr, const char16_t* aPhase=nullptr,
+                          const char16_t* aAction=nullptr, const char16_t* aCommand=nullptr,
+                          const char16_t* aKeyCode=nullptr, const char16_t* aCharCode=nullptr,
+                          const char16_t* aModifiers=nullptr, const char16_t* aButton=nullptr,
+                          const char16_t* aClickCount=nullptr, const char16_t* aGroup=nullptr,
+                          const char16_t* aPreventDefault=nullptr,
+                          const char16_t* aAllowUntrusted=nullptr);
+
+  void ReportKeyConflict(const char16_t* aKey, const char16_t* aModifiers, nsIContent* aElement, const char *aMessageName);
+  void GetEventType(nsAString& type);
+  bool ModifiersMatchMask(nsIDOMUIEvent* aEvent,
+                          const IgnoreModifierState& aIgnoreModifierState);
+  nsresult DispatchXBLCommand(mozilla::dom::EventTarget* aTarget, nsIDOMEvent* aEvent);
+  nsresult DispatchXULKeyCommand(nsIDOMEvent* aEvent);
+  nsresult EnsureEventHandler(mozilla::dom::AutoJSAPI& jsapi, nsIAtom* aName,
+                              JS::MutableHandle<JSObject*> aHandler);
+  static int32_t KeyToMask(int32_t key);
+  static int32_t AccelKeyMask();
+
+  static int32_t kMenuAccessKey;
+  static void InitAccessKeys();
+
+  static const int32_t cShift;
+  static const int32_t cAlt;
+  static const int32_t cControl;
+  static const int32_t cMeta;
+  static const int32_t cOS;
+
+  static const int32_t cShiftMask;
+  static const int32_t cAltMask;
+  static const int32_t cControlMask;
+  static const int32_t cMetaMask;
+  static const int32_t cOSMask;
+
+  static const int32_t cAllModifiers;
+
+protected:
+  union {
+    nsIWeakReference* mHandlerElement;  // For XUL <key> element handlers. [STRONG]
+    char16_t*        mHandlerText;     // For XBL handlers (we don't build an
+                                        // element for the <handler>, and instead
+                                        // we cache the JS text or command name
+                                        // that we should use.
+  };
+
+  uint32_t mLineNumber;  // The line number we started at in the XBL file
+  
+  // The following four values make up 32 bits.
+  uint8_t mPhase;            // The phase (capturing, bubbling)
+  uint8_t mType;             // The type of the handler.  The handler is either a XUL key
+                             // handler, an XBL "command" event, or a normal XBL event with
+                             // accompanying JavaScript.  The high bit is used to indicate
+                             // whether this handler should prevent the default action.
+  uint8_t mMisc;             // Miscellaneous extra information.  For key events,
+                             // stores whether or not we're a key code or char code.
+                             // For mouse events, stores the clickCount.
+
+  int32_t mKeyMask;          // Which modifier keys this event handler expects to have down
+                             // in order to be matched.
+ 
+  // The primary filter information for mouse/key events.
+  int32_t mDetail;           // For key events, contains a charcode or keycode. For
+                             // mouse events, stores the button info.
+
+  // Prototype handlers are chained. We own the next handler in the chain.
+  nsXBLPrototypeHandler* mNextHandler;
+  nsCOMPtr<nsIAtom> mEventName; // The type of the event, e.g., "keypress"
+  RefPtr<nsXBLEventHandler> mHandler;
+  nsXBLPrototypeBinding* mPrototypeBinding; // the binding owns us
+};
+
+#endif
diff --git a/dom/xbl/nsXBLPrototypeResources.cpp b/dom/xbl/nsXBLPrototypeResources.cpp
new file mode 100644
index 0000000000..a1ec426635
--- /dev/null
+++ b/dom/xbl/nsXBLPrototypeResources.cpp
@@ -0,0 +1,204 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIStyleRuleProcessor.h"
+#include "nsIDocument.h"
+#include "nsIContent.h"
+#include "nsIServiceManager.h"
+#include "nsXBLResourceLoader.h"
+#include "nsXBLPrototypeResources.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsIDocumentObserver.h"
+#include "mozilla/css/Loader.h"
+#include "nsIURI.h"
+#include "nsLayoutCID.h"
+#include "nsCSSRuleProcessor.h"
+#include "nsStyleSet.h"
+#include "mozilla/dom/URL.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+
+using namespace mozilla;
+using mozilla::dom::IsChromeURI;
+
+nsXBLPrototypeResources::nsXBLPrototypeResources(nsXBLPrototypeBinding* aBinding)
+{
+  MOZ_COUNT_CTOR(nsXBLPrototypeResources);
+
+  mLoader = new nsXBLResourceLoader(aBinding, this);
+}
+
+nsXBLPrototypeResources::~nsXBLPrototypeResources()
+{
+  MOZ_COUNT_DTOR(nsXBLPrototypeResources);
+  if (mLoader) {
+    mLoader->mResources = nullptr;
+  }
+}
+
+void
+nsXBLPrototypeResources::AddResource(nsIAtom* aResourceType, const nsAString& aSrc)
+{
+  if (mLoader)
+    mLoader->AddResource(aResourceType, aSrc);
+}
+
+void
+nsXBLPrototypeResources::LoadResources(bool* aResult)
+{
+  if (mLoader)
+    mLoader->LoadResources(aResult);
+  else
+    *aResult = true; // All resources loaded.
+}
+
+void
+nsXBLPrototypeResources::AddResourceListener(nsIContent* aBoundElement)
+{
+  if (mLoader)
+    mLoader->AddResourceListener(aBoundElement);
+}
+
+nsresult
+nsXBLPrototypeResources::FlushSkinSheets()
+{
+  if (mStyleSheetList.Length() == 0)
+    return NS_OK;
+
+  nsCOMPtr<nsIDocument> doc =
+    mLoader->mBinding->XBLDocumentInfo()->GetDocument();
+
+  // If doc is null, we're in the process of tearing things down, so just
+  // return without rebuilding anything.
+  if (!doc) {
+    return NS_OK;
+  }
+
+  // We have scoped stylesheets.  Reload any chrome stylesheets we
+  // encounter.  (If they aren't skin sheets, it doesn't matter, since
+  // they'll still be in the chrome cache.  Skip inline sheets, which
+  // skin sheets can't be, and which in any case don't have a usable
+  // URL to reload.)
+
+  nsTArray<RefPtr<StyleSheet>> oldSheets;
+
+  oldSheets.SwapElements(mStyleSheetList);
+
+  mozilla::css::Loader* cssLoader = doc->CSSLoader();
+
+  for (size_t i = 0, count = oldSheets.Length(); i < count; ++i) {
+    StyleSheet* oldSheet = oldSheets[i];
+
+    nsIURI* uri = oldSheet->GetSheetURI();
+
+    RefPtr<StyleSheet> newSheet;
+    if (!oldSheet->IsInline() && IsChromeURI(uri)) {
+      if (NS_FAILED(cssLoader->LoadSheetSync(uri, &newSheet)))
+        continue;
+    }
+    else {
+      newSheet = oldSheet;
+    }
+
+    mStyleSheetList.AppendElement(newSheet);
+  }
+
+  GatherRuleProcessor();
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLPrototypeResources::Write(nsIObjectOutputStream* aStream)
+{
+  if (mLoader)
+    return mLoader->Write(aStream);
+  return NS_OK;
+}
+
+void
+nsXBLPrototypeResources::Traverse(nsCycleCollectionTraversalCallback &cb)
+{
+  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "proto mResources mLoader");
+  cb.NoteXPCOMChild(mLoader);
+
+  CycleCollectionNoteChild(cb, mRuleProcessor.get(), "mRuleProcessor");
+  ImplCycleCollectionTraverse(cb, mStyleSheetList, "mStyleSheetList");
+}
+
+void
+nsXBLPrototypeResources::Unlink()
+{
+  mStyleSheetList.Clear();
+  mRuleProcessor = nullptr;
+}
+
+void
+nsXBLPrototypeResources::ClearLoader()
+{
+  mLoader = nullptr;
+}
+
+void
+nsXBLPrototypeResources::GatherRuleProcessor()
+{
+  nsTArray<RefPtr<CSSStyleSheet>> sheets(mStyleSheetList.Length());
+  for (StyleSheet* sheet : mStyleSheetList) {
+    MOZ_ASSERT(sheet->IsGecko(),
+               "GatherRuleProcessor must only be called for "
+               "nsXBLPrototypeResources objects with Gecko-flavored style "
+               "backends");
+    sheets.AppendElement(sheet->AsGecko());
+  }
+  mRuleProcessor = new nsCSSRuleProcessor(Move(sheets),
+                                          SheetType::Doc,
+                                          nullptr,
+                                          mRuleProcessor);
+}
+
+void
+nsXBLPrototypeResources::AppendStyleSheet(StyleSheet* aSheet)
+{
+  mStyleSheetList.AppendElement(aSheet);
+}
+
+void
+nsXBLPrototypeResources::RemoveStyleSheet(StyleSheet* aSheet)
+{
+  mStyleSheetList.RemoveElement(aSheet);
+}
+
+void
+nsXBLPrototypeResources::InsertStyleSheetAt(size_t aIndex, StyleSheet* aSheet)
+{
+  mStyleSheetList.InsertElementAt(aIndex, aSheet);
+}
+
+StyleSheet*
+nsXBLPrototypeResources::StyleSheetAt(size_t aIndex) const
+{
+  return mStyleSheetList[aIndex];
+}
+
+size_t
+nsXBLPrototypeResources::SheetCount() const
+{
+  return mStyleSheetList.Length();
+}
+
+bool
+nsXBLPrototypeResources::HasStyleSheets() const
+{
+  return !mStyleSheetList.IsEmpty();
+}
+
+void
+nsXBLPrototypeResources::AppendStyleSheetsTo(
+                                      nsTArray<StyleSheet*>& aResult) const
+{
+  aResult.AppendElements(mStyleSheetList);
+}
diff --git a/dom/xbl/nsXBLPrototypeResources.h b/dom/xbl/nsXBLPrototypeResources.h
new file mode 100644
index 0000000000..5ac1923ac9
--- /dev/null
+++ b/dom/xbl/nsXBLPrototypeResources.h
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLPrototypeResources_h__
+#define nsXBLPrototypeResources_h__
+
+#include "mozilla/StyleSheet.h"
+#include "nsICSSLoaderObserver.h"
+
+class nsCSSRuleProcessor;
+class nsIAtom;
+class nsIContent;
+class nsXBLPrototypeBinding;
+class nsXBLResourceLoader;
+
+namespace mozilla {
+class CSSStyleSheet;
+} // namespace mozilla
+
+// *********************************************************************/
+// The XBLPrototypeResources class
+
+class nsXBLPrototypeResources
+{
+public:
+  explicit nsXBLPrototypeResources(nsXBLPrototypeBinding* aBinding);
+  ~nsXBLPrototypeResources();
+
+  void LoadResources(bool* aResult);
+  void AddResource(nsIAtom* aResourceType, const nsAString& aSrc);
+  void AddResourceListener(nsIContent* aElement);
+  nsresult FlushSkinSheets();
+
+  nsresult Write(nsIObjectOutputStream* aStream);
+
+  void Traverse(nsCycleCollectionTraversalCallback &cb);
+  void Unlink();
+
+  void ClearLoader();
+
+  void AppendStyleSheet(mozilla::StyleSheet* aSheet);
+  void RemoveStyleSheet(mozilla::StyleSheet* aSheet);
+  void InsertStyleSheetAt(size_t aIndex, mozilla::StyleSheet* aSheet);
+  mozilla::StyleSheet* StyleSheetAt(size_t aIndex) const;
+  size_t SheetCount() const;
+  bool HasStyleSheets() const;
+  void AppendStyleSheetsTo(nsTArray<mozilla::StyleSheet*>& aResult) const;
+
+  /**
+   * Recreates mRuleProcessor to represent the current list of style sheets
+   * stored in mStyleSheetList.  (Named GatherRuleProcessor to parallel
+   * nsStyleSet::GatherRuleProcessors.)
+   */
+  void GatherRuleProcessor();
+
+  nsCSSRuleProcessor* GetRuleProcessor() const { return mRuleProcessor; }
+
+private:
+  // A loader object. Exists only long enough to load resources, and then it dies.
+  RefPtr<nsXBLResourceLoader> mLoader;
+
+  // A list of loaded stylesheets for this binding.
+  nsTArray<RefPtr<mozilla::StyleSheet>> mStyleSheetList;
+
+  // The list of stylesheets converted to a rule processor.
+  RefPtr<nsCSSRuleProcessor> mRuleProcessor;
+};
+
+#endif
diff --git a/dom/xbl/nsXBLResourceLoader.cpp b/dom/xbl/nsXBLResourceLoader.cpp
new file mode 100644
index 0000000000..e930e6f989
--- /dev/null
+++ b/dom/xbl/nsXBLResourceLoader.cpp
@@ -0,0 +1,294 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsTArray.h"
+#include "nsString.h"
+#include "nsIStyleRuleProcessor.h"
+#include "nsIDocument.h"
+#include "nsIContent.h"
+#include "nsIPresShell.h"
+#include "nsXBLService.h"
+#include "nsIServiceManager.h"
+#include "nsXBLResourceLoader.h"
+#include "nsXBLPrototypeResources.h"
+#include "nsIDocumentObserver.h"
+#include "imgILoader.h"
+#include "imgRequestProxy.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+#include "mozilla/css/Loader.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsGkAtoms.h"
+#include "nsFrameManager.h"
+#include "nsStyleContext.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsCSSRuleProcessor.h"
+#include "nsContentUtils.h"
+#include "nsStyleSet.h"
+#include "nsIScriptSecurityManager.h"
+
+using namespace mozilla;
+
+NS_IMPL_CYCLE_COLLECTION(nsXBLResourceLoader, mBoundElements)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXBLResourceLoader)
+  NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXBLResourceLoader)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXBLResourceLoader)
+
+struct nsXBLResource
+{
+  nsXBLResource* mNext;
+  nsIAtom* mType;
+  nsString mSrc;
+
+  nsXBLResource(nsIAtom* aType, const nsAString& aSrc)
+  {
+    MOZ_COUNT_CTOR(nsXBLResource);
+    mNext = nullptr;
+    mType = aType;
+    mSrc = aSrc;
+  }
+
+  ~nsXBLResource()
+  {
+    MOZ_COUNT_DTOR(nsXBLResource);
+    NS_CONTENT_DELETE_LIST_MEMBER(nsXBLResource, this, mNext);
+  }
+};
+
+nsXBLResourceLoader::nsXBLResourceLoader(nsXBLPrototypeBinding* aBinding,
+                                         nsXBLPrototypeResources* aResources)
+:mBinding(aBinding),
+ mResources(aResources),
+ mResourceList(nullptr),
+ mLastResource(nullptr),
+ mLoadingResources(false),
+ mInLoadResourcesFunc(false),
+ mPendingSheets(0)
+{
+}
+
+nsXBLResourceLoader::~nsXBLResourceLoader()
+{
+  delete mResourceList;
+}
+
+void
+nsXBLResourceLoader::LoadResources(bool* aResult)
+{
+  mInLoadResourcesFunc = true;
+
+  if (mLoadingResources) {
+    *aResult = (mPendingSheets == 0);
+    mInLoadResourcesFunc = false;
+    return;
+  }
+
+  mLoadingResources = true;
+  *aResult = true;
+
+  // Declare our loaders.
+  nsCOMPtr<nsIDocument> doc = mBinding->XBLDocumentInfo()->GetDocument();
+
+  mozilla::css::Loader* cssLoader = doc->CSSLoader();
+  nsIURI *docURL = doc->GetDocumentURI();
+  nsIPrincipal* docPrincipal = doc->NodePrincipal();
+
+  nsCOMPtr<nsIURI> url;
+
+  for (nsXBLResource* curr = mResourceList; curr; curr = curr->mNext) {
+    if (curr->mSrc.IsEmpty())
+      continue;
+
+    if (NS_FAILED(NS_NewURI(getter_AddRefs(url), curr->mSrc,
+                            doc->GetDocumentCharacterSet().get(), docURL)))
+      continue;
+
+    if (curr->mType == nsGkAtoms::image) {
+      // Now kick off the image load...
+      // Passing nullptr for pretty much everything -- cause we don't care!
+      // XXX: initialDocumentURI is nullptr! 
+      RefPtr<imgRequestProxy> req;
+      nsContentUtils::LoadImage(url, doc, doc, docPrincipal, docURL,
+                                doc->GetReferrerPolicy(), nullptr,
+                                nsIRequest::LOAD_BACKGROUND, EmptyString(),
+                                getter_AddRefs(req));
+    }
+    else if (curr->mType == nsGkAtoms::stylesheet) {
+      // Kick off the load of the stylesheet.
+
+      // Always load chrome synchronously
+      // XXXbz should that still do a content policy check?
+      bool chrome;
+      nsresult rv;
+      if (NS_SUCCEEDED(url->SchemeIs("chrome", &chrome)) && chrome)
+      {
+        rv = nsContentUtils::GetSecurityManager()->
+          CheckLoadURIWithPrincipal(docPrincipal, url,
+                                    nsIScriptSecurityManager::ALLOW_CHROME);
+        if (NS_SUCCEEDED(rv)) {
+          RefPtr<StyleSheet> sheet;
+          rv = cssLoader->LoadSheetSync(url, &sheet);
+          NS_ASSERTION(NS_SUCCEEDED(rv), "Load failed!!!");
+          if (NS_SUCCEEDED(rv))
+          {
+            rv = StyleSheetLoaded(sheet, false, NS_OK);
+            NS_ASSERTION(NS_SUCCEEDED(rv), "Processing the style sheet failed!!!");
+          }
+        }
+      }
+      else
+      {
+        rv = cssLoader->LoadSheet(url, false, docPrincipal, EmptyCString(), this);
+        if (NS_SUCCEEDED(rv))
+          ++mPendingSheets;
+      }
+    }
+  }
+
+  *aResult = (mPendingSheets == 0);
+  mInLoadResourcesFunc = false;
+  
+  // Destroy our resource list.
+  delete mResourceList;
+  mResourceList = nullptr;
+}
+
+// nsICSSLoaderObserver
+NS_IMETHODIMP
+nsXBLResourceLoader::StyleSheetLoaded(StyleSheet* aSheet,
+                                      bool aWasAlternate,
+                                      nsresult aStatus)
+{
+  if (!mResources) {
+    // Our resources got destroyed -- just bail out
+    return NS_OK;
+  }
+   
+  mResources->AppendStyleSheet(aSheet);
+
+  if (!mInLoadResourcesFunc)
+    mPendingSheets--;
+  
+  if (mPendingSheets == 0) {
+    // All stylesheets are loaded.  
+    mResources->GatherRuleProcessor();
+
+    // XXX Check for mPendingScripts when scripts also come online.
+    if (!mInLoadResourcesFunc)
+      NotifyBoundElements();
+  }
+  return NS_OK;
+}
+
+void 
+nsXBLResourceLoader::AddResource(nsIAtom* aResourceType, const nsAString& aSrc)
+{
+  nsXBLResource* res = new nsXBLResource(aResourceType, aSrc);
+  if (!mResourceList)
+    mResourceList = res;
+  else
+    mLastResource->mNext = res;
+
+  mLastResource = res;
+}
+
+void
+nsXBLResourceLoader::AddResourceListener(nsIContent* aBoundElement) 
+{
+  if (aBoundElement) {
+    mBoundElements.AppendObject(aBoundElement);
+  }
+}
+
+void
+nsXBLResourceLoader::NotifyBoundElements()
+{
+  nsXBLService* xblService = nsXBLService::GetInstance();
+  if (!xblService)
+    return;
+
+  nsIURI* bindingURI = mBinding->BindingURI();
+
+  uint32_t eltCount = mBoundElements.Count();
+  for (uint32_t j = 0; j < eltCount; j++) {
+    nsCOMPtr<nsIContent> content = mBoundElements.ObjectAt(j);
+    
+    bool ready = false;
+    xblService->BindingReady(content, bindingURI, &ready);
+
+    if (ready) {
+      // We need the document to flush out frame construction and
+      // such, so we want to use the current document.
+      nsIDocument* doc = content->GetUncomposedDoc();
+    
+      if (doc) {
+        // Flush first to make sure we can get the frame for content
+        doc->FlushPendingNotifications(Flush_Frames);
+
+        // If |content| is (in addition to having binding |mBinding|)
+        // also a descendant of another element with binding |mBinding|,
+        // then we might have just constructed it due to the
+        // notification of its parent.  (We can know about both if the
+        // binding loads were triggered from the DOM rather than frame
+        // construction.)  So we have to check both whether the element
+        // has a primary frame and whether it's in the undisplayed map
+        // before sending a ContentInserted notification, or bad things
+        // will happen.
+        nsIPresShell *shell = doc->GetShell();
+        if (shell) {
+          nsIFrame* childFrame = content->GetPrimaryFrame();
+          if (!childFrame) {
+            // Check to see if it's in the undisplayed content map.
+            nsStyleContext* sc =
+              shell->FrameManager()->GetUndisplayedContent(content);
+
+            if (!sc) {
+              shell->RecreateFramesFor(content);
+            }
+          }
+        }
+
+        // Flush again
+        // XXXbz why is this needed?
+        doc->FlushPendingNotifications(Flush_ContentAndNotify);
+      }
+    }
+  }
+
+  // Clear out the whole array.
+  mBoundElements.Clear();
+
+  // Delete ourselves.
+  mResources->ClearLoader();
+}
+
+nsresult
+nsXBLResourceLoader::Write(nsIObjectOutputStream* aStream)
+{
+  nsresult rv;
+
+  for (nsXBLResource* curr = mResourceList; curr; curr = curr->mNext) {
+    if (curr->mType == nsGkAtoms::image)
+      rv = aStream->Write8(XBLBinding_Serialize_Image);
+    else if (curr->mType == nsGkAtoms::stylesheet)
+      rv = aStream->Write8(XBLBinding_Serialize_Stylesheet);
+    else
+      continue;
+
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aStream->WriteWStringZ(curr->mSrc.get());
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
diff --git a/dom/xbl/nsXBLResourceLoader.h b/dom/xbl/nsXBLResourceLoader.h
new file mode 100644
index 0000000000..1311f11f7f
--- /dev/null
+++ b/dom/xbl/nsXBLResourceLoader.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLResourceLoader_h
+#define nsXBLResourceLoader_h
+
+#include "mozilla/Attributes.h"
+#include "nsCOMPtr.h"
+#include "nsICSSLoaderObserver.h"
+#include "nsCOMArray.h"
+#include "nsCycleCollectionParticipant.h"
+
+class nsIContent;
+class nsIAtom;
+class nsXBLPrototypeResources;
+class nsXBLPrototypeBinding;
+struct nsXBLResource;
+class nsIObjectOutputStream;
+
+// *********************************************************************/
+// The XBLResourceLoader class
+
+class nsXBLResourceLoader : public nsICSSLoaderObserver
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(nsXBLResourceLoader)
+
+  // nsICSSLoaderObserver
+  NS_IMETHOD StyleSheetLoaded(mozilla::StyleSheet* aSheet,
+                              bool aWasAlternate,
+                              nsresult aStatus) override;
+
+  void LoadResources(bool* aResult);
+  void AddResource(nsIAtom* aResourceType, const nsAString& aSrc);
+  void AddResourceListener(nsIContent* aElement);
+
+  nsXBLResourceLoader(nsXBLPrototypeBinding* aBinding,
+                      nsXBLPrototypeResources* aResources);
+
+  void NotifyBoundElements();
+
+  nsresult Write(nsIObjectOutputStream* aStream);
+
+// MEMBER VARIABLES
+  nsXBLPrototypeBinding* mBinding; // A pointer back to our binding.
+  nsXBLPrototypeResources* mResources; // A pointer back to our resources
+                                       // information.  May be null if the
+                                       // resources have already been
+                                       // destroyed.
+  
+  nsXBLResource* mResourceList; // The list of resources we need to load.
+  nsXBLResource* mLastResource;
+
+  bool mLoadingResources;
+  // We need mInLoadResourcesFunc because we do a mixture of sync and
+  // async loads.
+  bool mInLoadResourcesFunc;
+  int16_t mPendingSheets; // The number of stylesheets that have yet to load.
+
+  // Bound elements that are waiting on the stylesheets and scripts.
+  nsCOMArray<nsIContent> mBoundElements;
+
+protected:
+  virtual ~nsXBLResourceLoader();
+};
+
+#endif
diff --git a/dom/xbl/nsXBLSerialize.cpp b/dom/xbl/nsXBLSerialize.cpp
new file mode 100644
index 0000000000..b08c259657
--- /dev/null
+++ b/dom/xbl/nsXBLSerialize.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsXBLSerialize.h"
+
+#include "jsfriendapi.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsIXPConnect.h"
+#include "nsContentUtils.h"
+
+using namespace mozilla;
+
+nsresult
+XBL_SerializeFunction(nsIObjectOutputStream* aStream,
+                      JS::Handle<JSObject*> aFunction)
+{
+  AssertInCompilationScope();
+  AutoJSContext cx;
+  MOZ_ASSERT(js::GetContextCompartment(cx) == js::GetObjectCompartment(aFunction));
+  return nsContentUtils::XPConnect()->WriteFunction(aStream, cx, aFunction);
+}
+
+nsresult
+XBL_DeserializeFunction(nsIObjectInputStream* aStream,
+                        JS::MutableHandle<JSObject*> aFunctionObjectp)
+{
+  AssertInCompilationScope();
+  AutoJSContext cx;
+  return nsContentUtils::XPConnect()->ReadFunction(aStream, cx,
+                                                   aFunctionObjectp.address());
+}
diff --git a/dom/xbl/nsXBLSerialize.h b/dom/xbl/nsXBLSerialize.h
new file mode 100644
index 0000000000..2c1dedc334
--- /dev/null
+++ b/dom/xbl/nsXBLSerialize.h
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLSerialize_h__
+#define nsXBLSerialize_h__
+
+#include "nsIObjectInputStream.h"
+#include "nsIObjectOutputStream.h"
+#include "mozilla/dom/NameSpaceConstants.h"
+#include "js/TypeDecls.h"
+
+typedef uint8_t XBLBindingSerializeDetails;
+
+// A version number to ensure we don't load cached data in a different
+// file format.
+#define XBLBinding_Serialize_Version 0x00000004
+
+// Set for the first binding in a document
+#define XBLBinding_Serialize_IsFirstBinding 1
+
+// Set to indicate that nsXBLPrototypeBinding::mInheritStyle should be true
+#define XBLBinding_Serialize_InheritStyle 2
+
+// Set to indicate that nsXBLPrototypeBinding::mChromeOnlyContent should be true
+#define XBLBinding_Serialize_ChromeOnlyContent 4
+
+// Set to indicate that nsXBLPrototypeBinding::mBindToUntrustedContent should be true
+#define XBLBinding_Serialize_BindToUntrustedContent 8
+
+// Appears at the end of the serialized data to indicate that no more bindings
+// are present for this document.
+#define XBLBinding_Serialize_NoMoreBindings 0x80
+
+// Implementation member types. The serialized value for each member contains one
+// of these values, combined with the read-only flag XBLBinding_Serialize_ReadOnly.
+// Use XBLBinding_Serialize_Mask to filter out the read-only flag and check for
+// just the member type.
+#define XBLBinding_Serialize_NoMoreItems 0 // appears at the end of the members list
+#define XBLBinding_Serialize_Field 1
+#define XBLBinding_Serialize_GetterProperty 2
+#define XBLBinding_Serialize_SetterProperty 3
+#define XBLBinding_Serialize_GetterSetterProperty 4
+#define XBLBinding_Serialize_Method 5
+#define XBLBinding_Serialize_Constructor 6
+#define XBLBinding_Serialize_Destructor 7
+#define XBLBinding_Serialize_Handler 8
+#define XBLBinding_Serialize_Image 9
+#define XBLBinding_Serialize_Stylesheet 10
+#define XBLBinding_Serialize_Attribute 0xA
+#define XBLBinding_Serialize_Mask 0x0F
+#define XBLBinding_Serialize_ReadOnly 0x80
+
+// Appears at the end of the list of insertion points to indicate that there
+// are no more. 
+#define XBLBinding_Serialize_NoMoreInsertionPoints 0xFFFFFFFF
+
+// When serializing content nodes, a single-byte namespace id is written out
+// first. The special values below can appear in place of a namespace id.
+
+// Indicates that this is not one of the built-in namespaces defined in 
+// nsNameSpaceManager.h. The string form will be serialized immediately
+// following.
+#define XBLBinding_Serialize_CustomNamespace 0xFE
+
+// Flags to indicate a non-element node. Otherwise, it is an element. 
+#define XBLBinding_Serialize_TextNode 0xFB
+#define XBLBinding_Serialize_CDATANode 0xFC
+#define XBLBinding_Serialize_CommentNode 0xFD
+
+// Indicates that there is no content to serialize/deserialize
+#define XBLBinding_Serialize_NoContent 0xFF
+
+// Appears at the end of the forwarded attributes list to indicate that there
+// are no more attributes.
+#define XBLBinding_Serialize_NoMoreAttributes 0xFF
+
+static_assert(XBLBinding_Serialize_CustomNamespace >= kNameSpaceID_LastBuiltin,
+              "The custom namespace should not be in use as a real namespace");
+
+nsresult
+XBL_SerializeFunction(nsIObjectOutputStream* aStream,
+                      JS::Handle<JSObject*> aFunctionObject);
+
+nsresult
+XBL_DeserializeFunction(nsIObjectInputStream* aStream,
+                        JS::MutableHandle<JSObject*> aFunctionObject);
+
+#endif // nsXBLSerialize_h__
diff --git a/dom/xbl/nsXBLService.cpp b/dom/xbl/nsXBLService.cpp
new file mode 100644
index 0000000000..1475b1368d
--- /dev/null
+++ b/dom/xbl/nsXBLService.cpp
@@ -0,0 +1,1090 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsCOMPtr.h"
+#include "nsNetUtil.h"
+#include "nsXBLService.h"
+#include "nsXBLWindowKeyHandler.h"
+#include "nsIInputStream.h"
+#include "nsNameSpaceManager.h"
+#include "nsIURI.h"
+#include "nsIDOMElement.h"
+#include "nsIURL.h"
+#include "nsIChannel.h"
+#include "nsXPIDLString.h"
+#include "plstr.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsIXMLContentSink.h"
+#include "nsContentCID.h"
+#include "mozilla/dom/XMLDocument.h"
+#include "nsGkAtoms.h"
+#include "nsIMemory.h"
+#include "nsIObserverService.h"
+#include "nsIDOMNodeList.h"
+#include "nsXBLContentSink.h"
+#include "nsXBLBinding.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsXBLDocumentInfo.h"
+#include "nsCRT.h"
+#include "nsContentUtils.h"
+#include "nsSyncLoadService.h"
+#include "nsContentPolicyUtils.h"
+#include "nsTArray.h"
+#include "nsError.h"
+
+#include "nsIPresShell.h"
+#include "nsIDocumentObserver.h"
+#include "nsFrameManager.h"
+#include "nsStyleContext.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsIScriptError.h"
+#include "nsXBLSerialize.h"
+
+#ifdef MOZ_XUL
+#include "nsXULPrototypeCache.h"
+#endif
+#include "nsIDOMEventListener.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/EventListenerManager.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+#define NS_MAX_XBL_BINDING_RECURSION 20
+
+nsXBLService* nsXBLService::gInstance = nullptr;
+
+static bool
+IsAncestorBinding(nsIDocument* aDocument,
+                  nsIURI* aChildBindingURI,
+                  nsIContent* aChild)
+{
+  NS_ASSERTION(aDocument, "expected a document");
+  NS_ASSERTION(aChildBindingURI, "expected a binding URI");
+  NS_ASSERTION(aChild, "expected a child content");
+
+  uint32_t bindingRecursion = 0;
+  for (nsIContent *bindingParent = aChild->GetBindingParent();
+       bindingParent;
+       bindingParent = bindingParent->GetBindingParent()) {
+    nsXBLBinding* binding = bindingParent->GetXBLBinding();
+    if (!binding) {
+      continue;
+    }
+
+    if (binding->PrototypeBinding()->CompareBindingURI(aChildBindingURI)) {
+      ++bindingRecursion;
+      if (bindingRecursion < NS_MAX_XBL_BINDING_RECURSION) {
+        continue;
+      }
+      NS_ConvertUTF8toUTF16 bindingURI(aChildBindingURI->GetSpecOrDefault());
+      const char16_t* params[] = { bindingURI.get() };
+      nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                      NS_LITERAL_CSTRING("XBL"), aDocument,
+                                      nsContentUtils::eXBL_PROPERTIES,
+                                      "TooDeepBindingRecursion",
+                                      params, ArrayLength(params));
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// Individual binding requests.
+class nsXBLBindingRequest
+{
+public:
+  nsCOMPtr<nsIURI> mBindingURI;
+  nsCOMPtr<nsIContent> mBoundElement;
+
+  void DocumentLoaded(nsIDocument* aBindingDoc)
+  {
+    // We only need the document here to cause frame construction, so
+    // we need the current doc, not the owner doc.
+    nsIDocument* doc = mBoundElement->GetUncomposedDoc();
+    if (!doc)
+      return;
+
+    // Destroy the frames for mBoundElement.
+    nsIContent* destroyedFramesFor = nullptr;
+    nsIPresShell* shell = doc->GetShell();
+    if (shell) {
+      shell->DestroyFramesFor(mBoundElement, &destroyedFramesFor);
+    }
+    MOZ_ASSERT(!mBoundElement->GetPrimaryFrame());
+
+    // Get the binding.
+    bool ready = false;
+    nsXBLService::GetInstance()->BindingReady(mBoundElement, mBindingURI, &ready);
+    if (!ready)
+      return;
+
+    // If |mBoundElement| is (in addition to having binding |mBinding|)
+    // also a descendant of another element with binding |mBinding|,
+    // then we might have just constructed it due to the
+    // notification of its parent.  (We can know about both if the
+    // binding loads were triggered from the DOM rather than frame
+    // construction.)  So we have to check both whether the element
+    // has a primary frame and whether it's in the frame manager maps
+    // before sending a ContentInserted notification, or bad things
+    // will happen.
+    MOZ_ASSERT(shell == doc->GetShell());
+    if (shell) {
+      nsIFrame* childFrame = mBoundElement->GetPrimaryFrame();
+      if (!childFrame) {
+        // Check to see if it's in the undisplayed content map...
+        nsFrameManager* fm = shell->FrameManager();
+        nsStyleContext* sc = fm->GetUndisplayedContent(mBoundElement);
+        if (!sc) {
+          // or in the display:contents map.
+          sc = fm->GetDisplayContentsStyleFor(mBoundElement);
+        }
+        if (!sc) {
+          shell->CreateFramesFor(destroyedFramesFor);
+        }
+      }
+    }
+  }
+
+  nsXBLBindingRequest(nsIURI* aURI, nsIContent* aBoundElement)
+    : mBindingURI(aURI),
+      mBoundElement(aBoundElement)
+  {
+  }
+};
+
+// nsXBLStreamListener, a helper class used for
+// asynchronous parsing of URLs
+/* Header file */
+class nsXBLStreamListener final : public nsIStreamListener,
+                                  public nsIDOMEventListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISTREAMLISTENER
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSIDOMEVENTLISTENER
+
+  nsXBLStreamListener(nsIDocument* aBoundDocument,
+                      nsIXMLContentSink* aSink,
+                      nsIDocument* aBindingDocument);
+
+  void AddRequest(nsXBLBindingRequest* aRequest) { mBindingRequests.AppendElement(aRequest); }
+  bool HasRequest(nsIURI* aURI, nsIContent* aBoundElement);
+
+private:
+  ~nsXBLStreamListener();
+
+  nsCOMPtr<nsIStreamListener> mInner;
+  AutoTArray<nsXBLBindingRequest*, 8> mBindingRequests;
+
+  nsCOMPtr<nsIWeakReference> mBoundDocument;
+  nsCOMPtr<nsIXMLContentSink> mSink; // Only set until OnStartRequest
+  nsCOMPtr<nsIDocument> mBindingDocument; // Only set until OnStartRequest
+};
+
+/* Implementation file */
+NS_IMPL_ISUPPORTS(nsXBLStreamListener,
+                  nsIStreamListener,
+                  nsIRequestObserver,
+                  nsIDOMEventListener)
+
+nsXBLStreamListener::nsXBLStreamListener(nsIDocument* aBoundDocument,
+                                         nsIXMLContentSink* aSink,
+                                         nsIDocument* aBindingDocument)
+: mSink(aSink), mBindingDocument(aBindingDocument)
+{
+  /* member initializers and constructor code */
+  mBoundDocument = do_GetWeakReference(aBoundDocument);
+}
+
+nsXBLStreamListener::~nsXBLStreamListener()
+{
+  for (uint32_t i = 0; i < mBindingRequests.Length(); i++) {
+    nsXBLBindingRequest* req = mBindingRequests.ElementAt(i);
+    delete req;
+  }
+}
+
+NS_IMETHODIMP
+nsXBLStreamListener::OnDataAvailable(nsIRequest *request, nsISupports* aCtxt,
+                                     nsIInputStream* aInStr,
+                                     uint64_t aSourceOffset, uint32_t aCount)
+{
+  if (mInner)
+    return mInner->OnDataAvailable(request, aCtxt, aInStr, aSourceOffset, aCount);
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsXBLStreamListener::OnStartRequest(nsIRequest* request, nsISupports* aCtxt)
+{
+  // Make sure we don't hold on to the sink and binding document past this point
+  nsCOMPtr<nsIXMLContentSink> sink;
+  mSink.swap(sink);
+  nsCOMPtr<nsIDocument> doc;
+  mBindingDocument.swap(doc);
+
+  nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
+  NS_ENSURE_TRUE(channel, NS_ERROR_UNEXPECTED);
+
+  nsCOMPtr<nsILoadGroup> group;
+  request->GetLoadGroup(getter_AddRefs(group));
+
+  nsresult rv = doc->StartDocumentLoad("loadAsInteractiveData",
+                                       channel,
+                                       group,
+                                       nullptr,
+                                       getter_AddRefs(mInner),
+                                       true,
+                                       sink);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Make sure to add ourselves as a listener after StartDocumentLoad,
+  // since that resets the event listners on the document.
+  doc->AddEventListener(NS_LITERAL_STRING("load"), this, false);
+
+  return mInner->OnStartRequest(request, aCtxt);
+}
+
+NS_IMETHODIMP
+nsXBLStreamListener::OnStopRequest(nsIRequest* request, nsISupports* aCtxt, nsresult aStatus)
+{
+  nsresult rv = NS_OK;
+  if (mInner) {
+     rv = mInner->OnStopRequest(request, aCtxt, aStatus);
+  }
+
+  // Don't hold onto the inner listener; holding onto it can create a cycle
+  // with the document
+  mInner = nullptr;
+
+  return rv;
+}
+
+bool
+nsXBLStreamListener::HasRequest(nsIURI* aURI, nsIContent* aElt)
+{
+  // XXX Could be more efficient.
+  uint32_t count = mBindingRequests.Length();
+  for (uint32_t i = 0; i < count; i++) {
+    nsXBLBindingRequest* req = mBindingRequests.ElementAt(i);
+    bool eq;
+    if (req->mBoundElement == aElt &&
+        NS_SUCCEEDED(req->mBindingURI->Equals(aURI, &eq)) && eq)
+      return true;
+  }
+
+  return false;
+}
+
+nsresult
+nsXBLStreamListener::HandleEvent(nsIDOMEvent* aEvent)
+{
+  nsresult rv = NS_OK;
+  uint32_t i;
+  uint32_t count = mBindingRequests.Length();
+
+  // Get the binding document; note that we don't hold onto it in this object
+  // to avoid creating a cycle
+  Event* event = aEvent->InternalDOMEvent();
+  EventTarget* target = event->GetCurrentTarget();
+  nsCOMPtr<nsIDocument> bindingDocument = do_QueryInterface(target);
+  NS_ASSERTION(bindingDocument, "Event not targeted at document?!");
+
+  // See if we're still alive.
+  nsCOMPtr<nsIDocument> doc(do_QueryReferent(mBoundDocument));
+  if (!doc) {
+    NS_WARNING("XBL load did not complete until after document went away! Modal dialog bug?\n");
+  }
+  else {
+    // We have to do a flush prior to notification of the document load.
+    // This has to happen since the HTML content sink can be holding on
+    // to notifications related to our children (e.g., if you bind to the
+    // <body> tag) that result in duplication of content.
+    // We need to get the sink's notifications flushed and then make the binding
+    // ready.
+    if (count > 0) {
+      nsXBLBindingRequest* req = mBindingRequests.ElementAt(0);
+      nsIDocument* document = req->mBoundElement->GetUncomposedDoc();
+      if (document)
+        document->FlushPendingNotifications(Flush_ContentAndNotify);
+    }
+
+    // Remove ourselves from the set of pending docs.
+    nsBindingManager *bindingManager = doc->BindingManager();
+    nsIURI* documentURI = bindingDocument->GetDocumentURI();
+    bindingManager->RemoveLoadingDocListener(documentURI);
+
+    if (!bindingDocument->GetRootElement()) {
+      // FIXME: How about an error console warning?
+      NS_WARNING("XBL doc with no root element - this usually shouldn't happen");
+      return NS_ERROR_FAILURE;
+    }
+
+    // Put our doc info in the doc table.
+    nsBindingManager *xblDocBindingManager = bindingDocument->BindingManager();
+    RefPtr<nsXBLDocumentInfo> info =
+      xblDocBindingManager->GetXBLDocumentInfo(documentURI);
+    xblDocBindingManager->RemoveXBLDocumentInfo(info); // Break the self-imposed cycle.
+    if (!info) {
+      if (nsXBLService::IsChromeOrResourceURI(documentURI)) {
+        NS_WARNING("An XBL file is malformed. Did you forget the XBL namespace on the bindings tag?");
+      }
+      nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                      NS_LITERAL_CSTRING("XBL"), nullptr,
+                                      nsContentUtils::eXBL_PROPERTIES,
+                                      "MalformedXBL",
+                                      nullptr, 0, documentURI);
+      return NS_ERROR_FAILURE;
+    }
+
+    // If the doc is a chrome URI, then we put it into the XUL cache.
+#ifdef MOZ_XUL
+    if (nsXBLService::IsChromeOrResourceURI(documentURI)) {
+      nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance();
+      if (cache && cache->IsEnabled())
+        cache->PutXBLDocumentInfo(info);
+    }
+#endif
+
+    bindingManager->PutXBLDocumentInfo(info);
+
+    // Notify all pending requests that their bindings are
+    // ready and can be installed.
+    for (i = 0; i < count; i++) {
+      nsXBLBindingRequest* req = mBindingRequests.ElementAt(i);
+      req->DocumentLoaded(bindingDocument);
+    }
+  }
+
+  target->RemoveEventListener(NS_LITERAL_STRING("load"), this, false);
+
+  return rv;
+}
+
+// Implementation /////////////////////////////////////////////////////////////////
+
+// Implement our nsISupports methods
+NS_IMPL_ISUPPORTS(nsXBLService, nsISupportsWeakReference)
+
+void
+nsXBLService::Init()
+{
+  gInstance = new nsXBLService();
+  NS_ADDREF(gInstance);
+}
+
+// Constructors/Destructors
+nsXBLService::nsXBLService(void)
+{
+}
+
+nsXBLService::~nsXBLService(void)
+{
+}
+
+// static
+bool
+nsXBLService::IsChromeOrResourceURI(nsIURI* aURI)
+{
+  bool isChrome = false;
+  bool isResource = false;
+  if (NS_SUCCEEDED(aURI->SchemeIs("chrome", &isChrome)) &&
+      NS_SUCCEEDED(aURI->SchemeIs("resource", &isResource)))
+      return (isChrome || isResource);
+  return false;
+}
+
+
+// This function loads a particular XBL file and installs all of the bindings
+// onto the element.
+nsresult
+nsXBLService::LoadBindings(nsIContent* aContent, nsIURI* aURL,
+                           nsIPrincipal* aOriginPrincipal,
+                           nsXBLBinding** aBinding, bool* aResolveStyle)
+{
+  NS_PRECONDITION(aOriginPrincipal, "Must have an origin principal");
+
+  *aBinding = nullptr;
+  *aResolveStyle = false;
+
+  nsresult rv;
+
+  nsCOMPtr<nsIDocument> document = aContent->OwnerDoc();
+
+  nsAutoCString urlspec;
+  bool ok = nsContentUtils::GetWrapperSafeScriptFilename(document, aURL,
+                                                         urlspec, &rv);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (ok) {
+    // Block an attempt to load a binding that has special wrapper
+    // automation needs.
+    return NS_OK;
+  }
+
+  nsXBLBinding *binding = aContent->GetXBLBinding();
+  if (binding) {
+    if (binding->MarkedForDeath()) {
+      FlushStyleBindings(aContent);
+      binding = nullptr;
+    }
+    else {
+      // See if the URIs match.
+      if (binding->PrototypeBinding()->CompareBindingURI(aURL))
+        return NS_OK;
+      FlushStyleBindings(aContent);
+      binding = nullptr;
+    }
+  }
+
+  bool ready;
+  RefPtr<nsXBLBinding> newBinding;
+  if (NS_FAILED(rv = GetBinding(aContent, aURL, false, aOriginPrincipal,
+                                &ready, getter_AddRefs(newBinding)))) {
+    return rv;
+  }
+
+  if (!newBinding) {
+#ifdef DEBUG
+    nsAutoCString str(NS_LITERAL_CSTRING("Failed to locate XBL binding. XBL is now using id instead of name to reference bindings. Make sure you have switched over.  The invalid binding name is: ") + aURL->GetSpecOrDefault());
+    NS_ERROR(str.get());
+#endif
+    return NS_OK;
+  }
+
+  if (::IsAncestorBinding(document, aURL, aContent)) {
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  // We loaded a style binding.  It goes on the end.
+  if (binding) {
+    // Get the last binding that is in the append layer.
+    binding->RootBinding()->SetBaseBinding(newBinding);
+  }
+  else {
+    // Install the binding on the content node.
+    aContent->SetXBLBinding(newBinding);
+  }
+
+  {
+    nsAutoScriptBlocker scriptBlocker;
+
+    // Set the binding's bound element.
+    newBinding->SetBoundElement(aContent);
+
+    // Tell the binding to build the anonymous content.
+    newBinding->GenerateAnonymousContent();
+
+    // Tell the binding to install event handlers
+    newBinding->InstallEventHandlers();
+
+    // Set up our properties
+    rv = newBinding->InstallImplementation();
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // Figure out if we have any scoped sheets.  If so, we do a second resolve.
+    *aResolveStyle = newBinding->HasStyleSheets();
+
+    newBinding.forget(aBinding);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLService::FlushStyleBindings(nsIContent* aContent)
+{
+  nsCOMPtr<nsIDocument> document = aContent->OwnerDoc();
+
+  nsXBLBinding *binding = aContent->GetXBLBinding();
+  if (binding) {
+    // Clear out the script references.
+    binding->ChangeDocument(document, nullptr);
+
+    aContent->SetXBLBinding(nullptr); // Flush old style bindings
+  }
+
+  return NS_OK;
+}
+
+//
+// AttachGlobalKeyHandler
+//
+// Creates a new key handler and prepares to listen to key events on the given
+// event receiver (either a document or an content node). If the receiver is content,
+// then extra work needs to be done to hook it up to the document (XXX WHY??)
+//
+nsresult
+nsXBLService::AttachGlobalKeyHandler(EventTarget* aTarget)
+{
+  // check if the receiver is a content node (not a document), and hook
+  // it to the document if that is the case.
+  nsCOMPtr<EventTarget> piTarget = aTarget;
+  nsCOMPtr<nsIContent> contentNode(do_QueryInterface(aTarget));
+  if (contentNode) {
+    // Only attach if we're really in a document
+    nsCOMPtr<nsIDocument> doc = contentNode->GetUncomposedDoc();
+    if (doc)
+      piTarget = doc; // We're a XUL keyset. Attach to our document.
+  }
+
+  if (!piTarget)
+    return NS_ERROR_FAILURE;
+
+  EventListenerManager* manager = piTarget->GetOrCreateListenerManager();
+  if (!manager)
+    return NS_ERROR_FAILURE;
+
+  // the listener already exists, so skip this
+  if (contentNode && contentNode->GetProperty(nsGkAtoms::listener))
+    return NS_OK;
+
+  nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(contentNode));
+
+  // Create the key handler
+  RefPtr<nsXBLWindowKeyHandler> handler =
+    NS_NewXBLWindowKeyHandler(elt, piTarget);
+
+  handler->InstallKeyboardEventListenersTo(manager);
+
+  if (contentNode)
+    return contentNode->SetProperty(nsGkAtoms::listener,
+                                    handler.forget().take(),
+                                    nsPropertyTable::SupportsDtorFunc, true);
+
+  // The reference to the handler will be maintained by the event target,
+  // and, if there is a content node, the property.
+  return NS_OK;
+}
+
+//
+// DetachGlobalKeyHandler
+//
+// Removes a key handler added by DeatchGlobalKeyHandler.
+//
+nsresult
+nsXBLService::DetachGlobalKeyHandler(EventTarget* aTarget)
+{
+  nsCOMPtr<EventTarget> piTarget = aTarget;
+  nsCOMPtr<nsIContent> contentNode(do_QueryInterface(aTarget));
+  if (!contentNode) // detaching is only supported for content nodes
+    return NS_ERROR_FAILURE;
+
+  // Only attach if we're really in a document
+  nsCOMPtr<nsIDocument> doc = contentNode->GetUncomposedDoc();
+  if (doc)
+    piTarget = do_QueryInterface(doc);
+
+  if (!piTarget)
+    return NS_ERROR_FAILURE;
+
+  EventListenerManager* manager = piTarget->GetOrCreateListenerManager();
+  if (!manager)
+    return NS_ERROR_FAILURE;
+
+  nsIDOMEventListener* handler =
+    static_cast<nsIDOMEventListener*>(contentNode->GetProperty(nsGkAtoms::listener));
+  if (!handler)
+    return NS_ERROR_FAILURE;
+
+  static_cast<nsXBLWindowKeyHandler*>(handler)->
+    RemoveKeyboardEventListenersFrom(manager);
+
+  contentNode->DeleteProperty(nsGkAtoms::listener);
+
+  return NS_OK;
+}
+
+// Internal helper methods ////////////////////////////////////////////////////////////////
+
+nsresult
+nsXBLService::BindingReady(nsIContent* aBoundElement,
+                           nsIURI* aURI,
+                           bool* aIsReady)
+{
+  // Don't do a security check here; we know this binding is set to go.
+  return GetBinding(aBoundElement, aURI, true, nullptr, aIsReady, nullptr);
+}
+
+nsresult
+nsXBLService::GetBinding(nsIContent* aBoundElement, nsIURI* aURI,
+                         bool aPeekOnly, nsIPrincipal* aOriginPrincipal,
+                         bool* aIsReady, nsXBLBinding** aResult)
+{
+  // More than 6 binding URIs are rare, see bug 55070 comment 18.
+  AutoTArray<nsCOMPtr<nsIURI>, 6> uris;
+  return GetBinding(aBoundElement, aURI, aPeekOnly, aOriginPrincipal, aIsReady,
+                    aResult, uris);
+}
+
+static bool
+MayBindToContent(nsXBLPrototypeBinding* aProtoBinding, nsIContent* aBoundElement,
+                 nsIURI* aURI)
+{
+  // If this binding explicitly allows untrusted content, we're done.
+  if (aProtoBinding->BindToUntrustedContent()) {
+    return true;
+  }
+
+  // We let XUL content and content in XUL documents through, since XUL is
+  // restricted anyway and we want to minimize remote XUL breakage.
+  if (aBoundElement->IsXULElement() ||
+      aBoundElement->OwnerDoc()->IsXULElement()) {
+    return true;
+  }
+
+  // Similarly, we make an exception for anonymous content (which
+  // lives in the XBL scope), because it's already protected from content,
+  // and tends to use a lot of bindings that we wouldn't otherwise need to
+  // whitelist.
+  if (aBoundElement->IsInAnonymousSubtree()) {
+    return true;
+  }
+
+  // Allow if the bound content subsumes the binding.
+  nsCOMPtr<nsIDocument> bindingDoc = aProtoBinding->XBLDocumentInfo()->GetDocument();
+  NS_ENSURE_TRUE(bindingDoc, false);
+  if (aBoundElement->NodePrincipal()->Subsumes(bindingDoc->NodePrincipal())) {
+    return true;
+  }
+
+  // One last special case: we need to watch out for in-document data: URI
+  // bindings from remote-XUL-whitelisted domains (especially tests), because
+  // they end up with a null principal (rather than inheriting the document's
+  // principal), which causes them to fail the check above.
+  if (nsContentUtils::AllowXULXBLForPrincipal(aBoundElement->NodePrincipal())) {
+    bool isDataURI = false;
+    nsresult rv = aURI->SchemeIs("data", &isDataURI);
+    NS_ENSURE_SUCCESS(rv, false);
+    if (isDataURI) {
+      return true;
+    }
+  }
+
+  // Disallow.
+  return false;
+}
+
+nsresult
+nsXBLService::GetBinding(nsIContent* aBoundElement, nsIURI* aURI,
+                         bool aPeekOnly, nsIPrincipal* aOriginPrincipal,
+                         bool* aIsReady, nsXBLBinding** aResult,
+                         nsTArray<nsCOMPtr<nsIURI>>& aDontExtendURIs)
+{
+  NS_ASSERTION(aPeekOnly || aResult,
+               "Must have non-null out param if not just peeking to see "
+               "whether the binding is ready");
+
+  if (aResult)
+    *aResult = nullptr;
+
+  if (!aURI)
+    return NS_ERROR_FAILURE;
+
+  nsAutoCString ref;
+  aURI->GetRef(ref);
+
+  nsCOMPtr<nsIDocument> boundDocument = aBoundElement->OwnerDoc();
+
+  RefPtr<nsXBLDocumentInfo> docInfo;
+  nsresult rv = LoadBindingDocumentInfo(aBoundElement, boundDocument, aURI,
+                                        aOriginPrincipal,
+                                        false, getter_AddRefs(docInfo));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!docInfo)
+    return NS_ERROR_FAILURE;
+
+  WeakPtr<nsXBLPrototypeBinding> protoBinding =
+    docInfo->GetPrototypeBinding(ref);
+
+  if (!protoBinding) {
+#ifdef DEBUG
+    nsAutoCString message("Unable to locate an XBL binding for URI ");
+    message += aURI->GetSpecOrDefault();
+    message += " in document ";
+    message += boundDocument->GetDocumentURI()->GetSpecOrDefault();
+    NS_WARNING(message.get());
+#endif
+    return NS_ERROR_FAILURE;
+  }
+
+  // If the binding isn't whitelisted, refuse to apply it to content that
+  // doesn't subsume it (modulo a few exceptions).
+  if (!MayBindToContent(protoBinding, aBoundElement, aURI)) {
+#ifdef DEBUG
+    nsAutoCString message("Permission denied to apply binding ");
+    message += aURI->GetSpecOrDefault();
+    message += " to unprivileged content. Set bindToUntrustedContent=true on "
+               "the binding to override this restriction.";
+    NS_WARNING(message.get());
+#endif
+   return NS_ERROR_FAILURE;
+  }
+
+  aDontExtendURIs.AppendElement(protoBinding->BindingURI());
+  nsCOMPtr<nsIURI> altBindingURI = protoBinding->AlternateBindingURI();
+  if (altBindingURI) {
+    aDontExtendURIs.AppendElement(altBindingURI);
+  }
+
+  // Our prototype binding must have all its resources loaded.
+  bool ready = protoBinding->LoadResources();
+  if (!ready) {
+    // Add our bound element to the protos list of elts that should
+    // be notified when the stylesheets and scripts finish loading.
+    protoBinding->AddResourceListener(aBoundElement);
+    return NS_ERROR_FAILURE; // The binding isn't ready yet.
+  }
+
+  rv = protoBinding->ResolveBaseBinding();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIURI> baseBindingURI;
+  WeakPtr<nsXBLPrototypeBinding> baseProto = protoBinding->GetBasePrototype();
+  if (baseProto) {
+    baseBindingURI = baseProto->BindingURI();
+  }
+  else {
+    baseBindingURI = protoBinding->GetBaseBindingURI();
+    if (baseBindingURI) {
+      uint32_t count = aDontExtendURIs.Length();
+      for (uint32_t index = 0; index < count; ++index) {
+        bool equal;
+        rv = aDontExtendURIs[index]->Equals(baseBindingURI, &equal);
+        NS_ENSURE_SUCCESS(rv, rv);
+        if (equal) {
+          NS_ConvertUTF8toUTF16
+            protoSpec(protoBinding->BindingURI()->GetSpecOrDefault());
+          NS_ConvertUTF8toUTF16 baseSpec(baseBindingURI->GetSpecOrDefault());
+          const char16_t* params[] = { protoSpec.get(), baseSpec.get() };
+          nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                          NS_LITERAL_CSTRING("XBL"), nullptr,
+                                          nsContentUtils::eXBL_PROPERTIES,
+                                          "CircularExtendsBinding",
+                                          params, ArrayLength(params),
+                                          boundDocument->GetDocumentURI());
+          return NS_ERROR_ILLEGAL_VALUE;
+        }
+      }
+    }
+  }
+
+  RefPtr<nsXBLBinding> baseBinding;
+  if (baseBindingURI) {
+    nsCOMPtr<nsIContent> child = protoBinding->GetBindingElement();
+    rv = GetBinding(aBoundElement, baseBindingURI, aPeekOnly,
+                    child->NodePrincipal(), aIsReady,
+                    getter_AddRefs(baseBinding), aDontExtendURIs);
+    if (NS_FAILED(rv))
+      return rv; // We aren't ready yet.
+  }
+
+  *aIsReady = true;
+
+  if (!aPeekOnly) {
+    // Make a new binding
+    NS_ENSURE_STATE(protoBinding);
+    nsXBLBinding *newBinding = new nsXBLBinding(protoBinding);
+
+    if (baseBinding) {
+      if (!baseProto) {
+        protoBinding->SetBasePrototype(baseBinding->PrototypeBinding());
+      }
+       newBinding->SetBaseBinding(baseBinding);
+    }
+
+    NS_ADDREF(*aResult = newBinding);
+  }
+
+  return NS_OK;
+}
+
+static bool
+IsSystemOrChromeURLPrincipal(nsIPrincipal* aPrincipal)
+{
+  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
+    return true;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  aPrincipal->GetURI(getter_AddRefs(uri));
+  NS_ENSURE_TRUE(uri, false);
+
+  bool isChrome = false;
+  return NS_SUCCEEDED(uri->SchemeIs("chrome", &isChrome)) && isChrome;
+}
+
+nsresult
+nsXBLService::LoadBindingDocumentInfo(nsIContent* aBoundElement,
+                                      nsIDocument* aBoundDocument,
+                                      nsIURI* aBindingURI,
+                                      nsIPrincipal* aOriginPrincipal,
+                                      bool aForceSyncLoad,
+                                      nsXBLDocumentInfo** aResult)
+{
+  NS_PRECONDITION(aBindingURI, "Must have a binding URI");
+  NS_PRECONDITION(!aOriginPrincipal || aBoundDocument,
+                  "If we're doing a security check, we better have a document!");
+
+  *aResult = nullptr;
+  // Allow XBL in unprivileged documents if it's specified in a privileged or
+  // chrome: stylesheet. This allows themes to specify XBL bindings.
+  if (aOriginPrincipal && !IsSystemOrChromeURLPrincipal(aOriginPrincipal)) {
+    NS_ENSURE_TRUE(!aBoundDocument || aBoundDocument->AllowXULXBL(),
+                   NS_ERROR_XBL_BLOCKED);
+  }
+
+  RefPtr<nsXBLDocumentInfo> info;
+
+  nsCOMPtr<nsIURI> documentURI;
+  nsresult rv = aBindingURI->CloneIgnoringRef(getter_AddRefs(documentURI));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsBindingManager *bindingManager = nullptr;
+
+  // The first thing to check is the binding manager, which (if it exists)
+  // should have a reference to the nsXBLDocumentInfo if this document
+  // has ever loaded this binding before.
+  if (aBoundDocument) {
+    bindingManager = aBoundDocument->BindingManager();
+    info = bindingManager->GetXBLDocumentInfo(documentURI);
+    if (aBoundDocument->IsStaticDocument() &&
+        IsChromeOrResourceURI(aBindingURI)) {
+      aForceSyncLoad = true;
+    }
+  }
+
+  // It's possible the document is already being loaded. If so, there's no
+  // document yet, but we need to glom on our request so that it will be
+  // processed whenever the doc does finish loading.
+  NodeInfo *ni = nullptr;
+  if (aBoundElement)
+    ni = aBoundElement->NodeInfo();
+
+  if (!info && bindingManager &&
+      (!ni || !(ni->Equals(nsGkAtoms::scrollbar, kNameSpaceID_XUL) ||
+                ni->Equals(nsGkAtoms::thumb, kNameSpaceID_XUL) ||
+                ((ni->Equals(nsGkAtoms::input) ||
+                  ni->Equals(nsGkAtoms::select)) &&
+                 aBoundElement->IsHTMLElement()))) && !aForceSyncLoad) {
+    nsCOMPtr<nsIStreamListener> listener;
+    if (bindingManager)
+      listener = bindingManager->GetLoadingDocListener(documentURI);
+    if (listener) {
+      nsXBLStreamListener* xblListener =
+        static_cast<nsXBLStreamListener*>(listener.get());
+      // Create a new load observer.
+      if (!xblListener->HasRequest(aBindingURI, aBoundElement)) {
+        nsXBLBindingRequest* req = new nsXBLBindingRequest(aBindingURI, aBoundElement);
+        xblListener->AddRequest(req);
+      }
+      return NS_OK;
+    }
+  }
+
+#ifdef MOZ_XUL
+  // The second line of defense is the global nsXULPrototypeCache,
+  // if it's being used.
+  nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance();
+  bool useXULCache = cache && cache->IsEnabled();
+
+  if (!info && useXULCache) {
+    // This cache crosses the entire product, so that any XBL bindings that are
+    // part of chrome will be reused across all XUL documents.
+    info = cache->GetXBLDocumentInfo(documentURI);
+  }
+
+  bool useStartupCache = useXULCache && IsChromeOrResourceURI(documentURI);
+
+  if (!info) {
+    // Next, look in the startup cache
+    if (!info && useStartupCache) {
+      rv = nsXBLDocumentInfo::ReadPrototypeBindings(documentURI, getter_AddRefs(info));
+      if (NS_SUCCEEDED(rv)) {
+        cache->PutXBLDocumentInfo(info);
+      }
+    }
+  }
+#endif
+
+  if (!info) {
+    // Finally, if all lines of defense fail, we go and fetch the binding
+    // document.
+
+    // Always load chrome synchronously
+    bool chrome;
+    if (NS_SUCCEEDED(documentURI->SchemeIs("chrome", &chrome)) && chrome)
+      aForceSyncLoad = true;
+
+    nsCOMPtr<nsIDocument> document;
+    rv = FetchBindingDocument(aBoundElement, aBoundDocument, documentURI,
+                              aBindingURI, aOriginPrincipal, aForceSyncLoad,
+                              getter_AddRefs(document));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (document) {
+      nsBindingManager *xblDocBindingManager = document->BindingManager();
+      info = xblDocBindingManager->GetXBLDocumentInfo(documentURI);
+      if (!info) {
+        NS_ERROR("An XBL file is malformed.  Did you forget the XBL namespace on the bindings tag?");
+        return NS_ERROR_FAILURE;
+      }
+      xblDocBindingManager->RemoveXBLDocumentInfo(info); // Break the self-imposed cycle.
+
+      // If the doc is a chrome URI, then we put it into the XUL cache.
+#ifdef MOZ_XUL
+      if (useStartupCache) {
+        cache->PutXBLDocumentInfo(info);
+
+        // now write the bindings into the startup cache
+        info->WritePrototypeBindings();
+      }
+#endif
+    }
+  }
+
+  if (info && bindingManager) {
+    // Cache it in our binding manager's document table. This way,
+    // we can ensure that if the document has loaded this binding
+    // before, it can continue to use it even if the XUL prototype
+    // cache gets flushed. That way, if a flush does occur, we
+    // don't get into a weird state where we're using different
+    // XBLDocumentInfos for the same XBL document in a single
+    // document that has loaded some bindings.
+    bindingManager->PutXBLDocumentInfo(info);
+  }
+
+  info.forget(aResult);
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLService::FetchBindingDocument(nsIContent* aBoundElement, nsIDocument* aBoundDocument,
+                                   nsIURI* aDocumentURI, nsIURI* aBindingURI,
+                                   nsIPrincipal* aOriginPrincipal, bool aForceSyncLoad,
+                                   nsIDocument** aResult)
+{
+  nsresult rv = NS_OK;
+  // Initialize our out pointer to nullptr
+  *aResult = nullptr;
+
+  // Now we have to synchronously load the binding file.
+  // Create an XML content sink and a parser.
+  nsCOMPtr<nsILoadGroup> loadGroup;
+  if (aBoundDocument)
+    loadGroup = aBoundDocument->GetDocumentLoadGroup();
+
+  // We really shouldn't have to force a sync load for anything here... could
+  // we get away with not doing that?  Not sure.
+  if (IsChromeOrResourceURI(aDocumentURI))
+    aForceSyncLoad = true;
+
+  // Create document and contentsink and set them up.
+  nsCOMPtr<nsIDocument> doc;
+  rv = NS_NewXMLDocument(getter_AddRefs(doc));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIXMLContentSink> xblSink;
+  rv = NS_NewXBLContentSink(getter_AddRefs(xblSink), doc, aDocumentURI, nullptr);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Open channel
+  // Note: There are some cases where aOriginPrincipal and aBoundDocument are purposely
+  // set to null (to bypass security checks) when calling LoadBindingDocumentInfo() which calls
+  // FetchBindingDocument().  LoadInfo will end up with no principal or node in those cases,
+  // so we use systemPrincipal.  This achieves the same result of bypassing security checks,
+  // but it gives the wrong information to potential future consumers of loadInfo.
+  nsCOMPtr<nsIChannel> channel;
+
+  if (aOriginPrincipal) {
+    // if there is an originPrincipal we should also have aBoundDocument
+    MOZ_ASSERT(aBoundDocument, "can not create a channel without aBoundDocument");
+
+    rv = NS_NewChannelWithTriggeringPrincipal(getter_AddRefs(channel),
+                                              aDocumentURI,
+                                              aBoundDocument,
+                                              aOriginPrincipal,
+                                              nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS |
+                                              nsILoadInfo::SEC_ALLOW_CHROME,
+                                              nsIContentPolicy::TYPE_XBL,
+                                              loadGroup);
+  }
+  else {
+    rv = NS_NewChannel(getter_AddRefs(channel),
+                       aDocumentURI,
+                       nsContentUtils::GetSystemPrincipal(),
+                       nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS,
+                       nsIContentPolicy::TYPE_XBL,
+                       loadGroup);
+  }
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!aForceSyncLoad) {
+    // We can be asynchronous
+    nsXBLStreamListener* xblListener =
+      new nsXBLStreamListener(aBoundDocument, xblSink, doc);
+
+    // Add ourselves to the list of loading docs.
+    nsBindingManager *bindingManager;
+    if (aBoundDocument)
+      bindingManager = aBoundDocument->BindingManager();
+    else
+      bindingManager = nullptr;
+
+    if (bindingManager)
+      bindingManager->PutLoadingDocListener(aDocumentURI, xblListener);
+
+    // Add our request.
+    nsXBLBindingRequest* req = new nsXBLBindingRequest(aBindingURI,
+                                                       aBoundElement);
+    xblListener->AddRequest(req);
+
+    // Now kick off the async read.
+    rv = channel->AsyncOpen2(xblListener);
+    if (NS_FAILED(rv)) {
+      // Well, we won't be getting a load.  Make sure to clean up our stuff!
+      if (bindingManager) {
+        bindingManager->RemoveLoadingDocListener(aDocumentURI);
+      }
+    }
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIStreamListener> listener;
+  rv = doc->StartDocumentLoad("loadAsInteractiveData",
+                              channel,
+                              loadGroup,
+                              nullptr,
+                              getter_AddRefs(listener),
+                              true,
+                              xblSink);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Now do a blocking synchronous parse of the file.
+  nsCOMPtr<nsIInputStream> in;
+  rv = channel->Open2(getter_AddRefs(in));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = nsSyncLoadService::PushSyncStreamToListener(in, listener, channel);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  doc.swap(*aResult);
+
+  return NS_OK;
+}
diff --git a/dom/xbl/nsXBLService.h b/dom/xbl/nsXBLService.h
new file mode 100644
index 0000000000..5082bc42b2
--- /dev/null
+++ b/dom/xbl/nsXBLService.h
@@ -0,0 +1,122 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef nsXBLService_h_
+#define nsXBLService_h_
+
+#include "nsString.h"
+#include "nsWeakReference.h"
+#include "nsTArray.h"
+#include "nsDataHashtable.h"
+#include "nsHashKeys.h"
+
+class nsXBLBinding;
+class nsXBLDocumentInfo;
+class nsIContent;
+class nsIDocument;
+class nsString;
+class nsIURI;
+class nsIPrincipal;
+
+namespace mozilla {
+namespace dom {
+class EventTarget;
+} // namespace dom
+} // namespace mozilla
+
+class nsXBLService final : public nsSupportsWeakReference
+{
+  NS_DECL_ISUPPORTS
+
+  static nsXBLService* gInstance;
+
+  static void Init();
+
+  static void Shutdown() {
+    NS_IF_RELEASE(gInstance);
+  }
+
+  static nsXBLService* GetInstance() { return gInstance; }
+
+  static bool IsChromeOrResourceURI(nsIURI* aURI);
+
+  // This function loads a particular XBL file and installs all of the bindings
+  // onto the element.  aOriginPrincipal must not be null here.
+  nsresult LoadBindings(nsIContent* aContent, nsIURI* aURL,
+                        nsIPrincipal* aOriginPrincipal,
+                        nsXBLBinding** aBinding, bool* aResolveStyle);
+
+  // Indicates whether or not a binding is fully loaded.
+  nsresult BindingReady(nsIContent* aBoundElement, nsIURI* aURI, bool* aIsReady);
+
+  // This method checks the hashtable and then calls FetchBindingDocument on a
+  // miss.  aOriginPrincipal or aBoundDocument may be null to bypass security
+  // checks.
+  nsresult LoadBindingDocumentInfo(nsIContent* aBoundElement,
+                                   nsIDocument* aBoundDocument,
+                                   nsIURI* aBindingURI,
+                                   nsIPrincipal* aOriginPrincipal,
+                                   bool aForceSyncLoad,
+                                   nsXBLDocumentInfo** aResult);
+
+  // Used by XUL key bindings and for window XBL.
+  static nsresult AttachGlobalKeyHandler(mozilla::dom::EventTarget* aTarget);
+  static nsresult DetachGlobalKeyHandler(mozilla::dom::EventTarget* aTarget);
+
+private:
+  nsXBLService();
+  virtual ~nsXBLService();
+
+protected:
+  // This function clears out the bindings on a given content node.
+  nsresult FlushStyleBindings(nsIContent* aContent);
+
+  // This method synchronously loads and parses an XBL file.
+  nsresult FetchBindingDocument(nsIContent* aBoundElement, nsIDocument* aBoundDocument,
+                                nsIURI* aDocumentURI, nsIURI* aBindingURI,
+                                nsIPrincipal* aOriginPrincipal, bool aForceSyncLoad,
+                                nsIDocument** aResult);
+
+  /**
+   * This method calls the one below with an empty |aDontExtendURIs| array.
+   */
+  nsresult GetBinding(nsIContent* aBoundElement, nsIURI* aURI,
+                      bool aPeekFlag, nsIPrincipal* aOriginPrincipal,
+                      bool* aIsReady, nsXBLBinding** aResult);
+
+  /**
+   * This method loads a binding doc and then builds the specific binding
+   * required. It can also peek without building.
+   * @param aBoundElement the element to get a binding for
+   * @param aURI the binding URI
+   * @param aPeekFlag if true then just peek to see if the binding is ready
+   * @param aIsReady [out] if the binding is ready or not
+   * @param aResult [out] where to store the resulting binding (not used if
+   *                      aPeekFlag is true, otherwise it must be non-null)
+   * @param aDontExtendURIs a set of URIs that are already bound to this
+   *        element. If a binding extends any of these then further loading
+   *        is aborted (because it would lead to the binding extending itself)
+   *        and NS_ERROR_ILLEGAL_VALUE is returned.
+   *
+   * @note This method always calls LoadBindingDocumentInfo(), so it's
+   *       enough to funnel all security checks through that function.
+   */
+  nsresult GetBinding(nsIContent* aBoundElement, nsIURI* aURI,
+                      bool aPeekFlag, nsIPrincipal* aOriginPrincipal,
+                      bool* aIsReady, nsXBLBinding** aResult,
+                      nsTArray<nsCOMPtr<nsIURI>>& aDontExtendURIs);
+
+// MEMBER VARIABLES
+public:
+  static bool gDisableChromeCache;
+  static bool     gAllowDataURIs;            // Whether we should allow data
+                                             // urls in -moz-binding. Needed for
+                                             // testing.
+};
+
+#endif
diff --git a/dom/xbl/nsXBLWindowKeyHandler.cpp b/dom/xbl/nsXBLWindowKeyHandler.cpp
new file mode 100644
index 0000000000..011b5c36bb
--- /dev/null
+++ b/dom/xbl/nsXBLWindowKeyHandler.cpp
@@ -0,0 +1,892 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsCOMPtr.h"
+#include "nsXBLPrototypeHandler.h"
+#include "nsXBLWindowKeyHandler.h"
+#include "nsIContent.h"
+#include "nsIAtom.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsXBLService.h"
+#include "nsIServiceManager.h"
+#include "nsGkAtoms.h"
+#include "nsXBLDocumentInfo.h"
+#include "nsIDOMElement.h"
+#include "nsFocusManager.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsContentUtils.h"
+#include "nsXBLPrototypeBinding.h"
+#include "nsPIDOMWindow.h"
+#include "nsIDocShell.h"
+#include "nsIPresShell.h"
+#include "mozilla/EventListenerManager.h"
+#include "mozilla/EventStateManager.h"
+#include "nsISelectionController.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/TextEvents.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/Event.h"
+#include "nsIEditor.h"
+#include "nsIHTMLEditor.h"
+#include "nsIDOMDocument.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+class nsXBLSpecialDocInfo : public nsIObserver
+{
+public:
+  RefPtr<nsXBLDocumentInfo> mHTMLBindings;
+  RefPtr<nsXBLDocumentInfo> mUserHTMLBindings;
+
+  static const char sHTMLBindingStr[];
+  static const char sUserHTMLBindingStr[];
+
+  bool mInitialized;
+
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  void LoadDocInfo();
+  void GetAllHandlers(const char* aType,
+                      nsXBLPrototypeHandler** handler,
+                      nsXBLPrototypeHandler** userHandler);
+  void GetHandlers(nsXBLDocumentInfo* aInfo,
+                   const nsACString& aRef,
+                   nsXBLPrototypeHandler** aResult);
+
+  nsXBLSpecialDocInfo() : mInitialized(false) {}
+
+protected:
+  virtual ~nsXBLSpecialDocInfo() {}
+
+};
+
+const char nsXBLSpecialDocInfo::sHTMLBindingStr[] =
+  "chrome://global/content/platformHTMLBindings.xml";
+
+NS_IMPL_ISUPPORTS(nsXBLSpecialDocInfo, nsIObserver)
+
+NS_IMETHODIMP
+nsXBLSpecialDocInfo::Observe(nsISupports* aSubject,
+                             const char* aTopic,
+                             const char16_t* aData)
+{
+  MOZ_ASSERT(!strcmp(aTopic, "xpcom-shutdown"), "wrong topic");
+
+  // On shutdown, clear our fields to avoid an extra cycle collection.
+  mHTMLBindings = nullptr;
+  mUserHTMLBindings = nullptr;
+  mInitialized = false;
+  nsContentUtils::UnregisterShutdownObserver(this);
+
+  return NS_OK;
+}
+
+void nsXBLSpecialDocInfo::LoadDocInfo()
+{
+  if (mInitialized)
+    return;
+  mInitialized = true;
+  nsContentUtils::RegisterShutdownObserver(this);
+
+  nsXBLService* xblService = nsXBLService::GetInstance();
+  if (!xblService)
+    return;
+
+  // Obtain the platform doc info
+  nsCOMPtr<nsIURI> bindingURI;
+  NS_NewURI(getter_AddRefs(bindingURI), sHTMLBindingStr);
+  if (!bindingURI) {
+    return;
+  }
+  xblService->LoadBindingDocumentInfo(nullptr, nullptr,
+                                      bindingURI,
+                                      nullptr,
+                                      true, 
+                                      getter_AddRefs(mHTMLBindings));
+
+  const nsAdoptingCString& userHTMLBindingStr =
+    Preferences::GetCString("dom.userHTMLBindings.uri");
+  if (!userHTMLBindingStr.IsEmpty()) {
+    NS_NewURI(getter_AddRefs(bindingURI), userHTMLBindingStr);
+    if (!bindingURI) {
+      return;
+    }
+
+    xblService->LoadBindingDocumentInfo(nullptr, nullptr,
+                                        bindingURI,
+                                        nullptr,
+                                        true, 
+                                        getter_AddRefs(mUserHTMLBindings));
+  }
+}
+
+//
+// GetHandlers
+//
+// 
+void
+nsXBLSpecialDocInfo::GetHandlers(nsXBLDocumentInfo* aInfo,
+                                 const nsACString& aRef,
+                                 nsXBLPrototypeHandler** aResult)
+{
+  nsXBLPrototypeBinding* binding = aInfo->GetPrototypeBinding(aRef);
+  
+  NS_ASSERTION(binding, "No binding found for the XBL window key handler.");
+  if (!binding)
+    return;
+
+  *aResult = binding->GetPrototypeHandlers();
+}
+
+void
+nsXBLSpecialDocInfo::GetAllHandlers(const char* aType,
+                                    nsXBLPrototypeHandler** aHandler,
+                                    nsXBLPrototypeHandler** aUserHandler)
+{
+  if (mUserHTMLBindings) {
+    nsAutoCString type(aType);
+    type.AppendLiteral("User");
+    GetHandlers(mUserHTMLBindings, type, aUserHandler);
+  }
+  if (mHTMLBindings) {
+    GetHandlers(mHTMLBindings, nsDependentCString(aType), aHandler);
+  }
+}
+
+// Init statics
+nsXBLSpecialDocInfo* nsXBLWindowKeyHandler::sXBLSpecialDocInfo = nullptr;
+uint32_t nsXBLWindowKeyHandler::sRefCnt = 0;
+
+nsXBLWindowKeyHandler::nsXBLWindowKeyHandler(nsIDOMElement* aElement,
+                                             EventTarget* aTarget)
+  : mTarget(aTarget),
+    mHandler(nullptr),
+    mUserHandler(nullptr)
+{
+  mWeakPtrForElement = do_GetWeakReference(aElement);
+  ++sRefCnt;
+}
+
+nsXBLWindowKeyHandler::~nsXBLWindowKeyHandler()
+{
+  // If mWeakPtrForElement is non-null, we created a prototype handler.
+  if (mWeakPtrForElement)
+    delete mHandler;
+
+  --sRefCnt;
+  if (!sRefCnt) {
+    NS_IF_RELEASE(sXBLSpecialDocInfo);
+  }
+}
+
+NS_IMPL_ISUPPORTS(nsXBLWindowKeyHandler,
+                  nsIDOMEventListener)
+
+static void
+BuildHandlerChain(nsIContent* aContent, nsXBLPrototypeHandler** aResult)
+{
+  *aResult = nullptr;
+
+  // Since we chain each handler onto the next handler,
+  // we'll enumerate them here in reverse so that when we
+  // walk the chain they'll come out in the original order
+  for (nsIContent* key = aContent->GetLastChild();
+       key;
+       key = key->GetPreviousSibling()) {
+
+    if (key->NodeInfo()->Equals(nsGkAtoms::key, kNameSpaceID_XUL)) {
+      // Check whether the key element has empty value at key/char attribute.
+      // Such element is used by localizers for alternative shortcut key
+      // definition on the locale. See bug 426501.
+      nsAutoString valKey, valCharCode, valKeyCode;
+      bool attrExists =
+        key->GetAttr(kNameSpaceID_None, nsGkAtoms::key, valKey) ||
+        key->GetAttr(kNameSpaceID_None, nsGkAtoms::charcode, valCharCode) ||
+        key->GetAttr(kNameSpaceID_None, nsGkAtoms::keycode, valKeyCode);
+      if (attrExists &&
+          valKey.IsEmpty() && valCharCode.IsEmpty() && valKeyCode.IsEmpty())
+        continue;
+
+      nsXBLPrototypeHandler* handler = new nsXBLPrototypeHandler(key);
+
+      handler->SetNextHandler(*aResult);
+      *aResult = handler;
+    }
+  }
+}
+
+//
+// EnsureHandlers
+//    
+// Lazily load the XBL handlers. Overridden to handle being attached
+// to a particular element rather than the document
+//
+nsresult
+nsXBLWindowKeyHandler::EnsureHandlers()
+{
+  nsCOMPtr<Element> el = GetElement();
+  NS_ENSURE_STATE(!mWeakPtrForElement || el);
+  if (el) {
+    // We are actually a XUL <keyset>.
+    if (mHandler)
+      return NS_OK;
+
+    nsCOMPtr<nsIContent> content(do_QueryInterface(el));
+    BuildHandlerChain(content, &mHandler);
+  } else { // We are an XBL file of handlers.
+    if (!sXBLSpecialDocInfo) {
+      sXBLSpecialDocInfo = new nsXBLSpecialDocInfo();
+      NS_ADDREF(sXBLSpecialDocInfo);
+    }
+    sXBLSpecialDocInfo->LoadDocInfo();
+
+    // Now determine which handlers we should be using.
+    if (IsHTMLEditableFieldFocused()) {
+      sXBLSpecialDocInfo->GetAllHandlers("editor", &mHandler, &mUserHandler);
+    }
+    else {
+      sXBLSpecialDocInfo->GetAllHandlers("browser", &mHandler, &mUserHandler);
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLWindowKeyHandler::WalkHandlers(nsIDOMKeyEvent* aKeyEvent, nsIAtom* aEventType)
+{
+  bool prevent;
+  aKeyEvent->AsEvent()->GetDefaultPrevented(&prevent);
+  if (prevent)
+    return NS_OK;
+
+  bool trustedEvent = false;
+  // Don't process the event if it was not dispatched from a trusted source
+  aKeyEvent->AsEvent()->GetIsTrusted(&trustedEvent);
+
+  if (!trustedEvent)
+    return NS_OK;
+
+  nsresult rv = EnsureHandlers();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool isDisabled;
+  nsCOMPtr<Element> el = GetElement(&isDisabled);
+  if (!el) {
+    if (mUserHandler) {
+      WalkHandlersInternal(aKeyEvent, aEventType, mUserHandler, true);
+      aKeyEvent->AsEvent()->GetDefaultPrevented(&prevent);
+      if (prevent)
+        return NS_OK; // Handled by the user bindings. Our work here is done.
+    }
+  }
+
+  // skip keysets that are disabled
+  if (el && isDisabled) {
+    return NS_OK;
+  }
+
+  WalkHandlersInternal(aKeyEvent, aEventType, mHandler, true);
+
+  return NS_OK;
+}
+
+void
+nsXBLWindowKeyHandler::InstallKeyboardEventListenersTo(
+                         EventListenerManager* aEventListenerManager)
+{
+  // For marking each keyboard event as if it's reserved by chrome,
+  // nsXBLWindowKeyHandlers need to listen each keyboard events before
+  // web contents.
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keydown"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keyup"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keypress"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeydownonplugin"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeyuponplugin"),
+                           TrustedEventsAtCapture());
+
+  // For reducing the IPC cost, preventing to dispatch reserved keyboard
+  // events into the content process.
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keydown"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keyup"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keypress"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeydownonplugin"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeyuponplugin"),
+                           TrustedEventsAtSystemGroupCapture());
+
+  // Handle keyboard events in bubbling phase of the system event group.
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keydown"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keyup"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("keypress"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeydownonplugin"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->AddEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeyuponplugin"),
+                           TrustedEventsAtSystemGroupBubble());
+}
+
+void
+nsXBLWindowKeyHandler::RemoveKeyboardEventListenersFrom(
+                         EventListenerManager* aEventListenerManager)
+{
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keydown"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keyup"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keypress"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeydownonplugin"),
+                           TrustedEventsAtCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeyuponplugin"),
+                           TrustedEventsAtCapture());
+
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keydown"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keyup"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keypress"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeydownonplugin"),
+                           TrustedEventsAtSystemGroupCapture());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeyuponplugin"),
+                           TrustedEventsAtSystemGroupCapture());
+
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keydown"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keyup"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("keypress"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeydownonplugin"),
+                           TrustedEventsAtSystemGroupBubble());
+  aEventListenerManager->RemoveEventListenerByType(
+                           this, NS_LITERAL_STRING("mozkeyuponplugin"),
+                           TrustedEventsAtSystemGroupBubble());
+}
+
+nsIAtom*
+nsXBLWindowKeyHandler::ConvertEventToDOMEventType(
+                         const WidgetKeyboardEvent& aWidgetKeyboardEvent) const
+{
+  if (aWidgetKeyboardEvent.IsKeyDownOrKeyDownOnPlugin()) {
+    return nsGkAtoms::keydown;
+  }
+  if (aWidgetKeyboardEvent.IsKeyUpOrKeyUpOnPlugin()) {
+    return nsGkAtoms::keyup;
+  }
+  if (aWidgetKeyboardEvent.mMessage == eKeyPress) {
+    return nsGkAtoms::keypress;
+  }
+  MOZ_ASSERT_UNREACHABLE(
+    "All event messages which this instance listens to should be handled");
+  return nullptr;
+}
+
+NS_IMETHODIMP
+nsXBLWindowKeyHandler::HandleEvent(nsIDOMEvent* aEvent)
+{
+  nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aEvent));
+  NS_ENSURE_TRUE(keyEvent, NS_ERROR_INVALID_ARG);
+
+  uint16_t eventPhase;
+  aEvent->GetEventPhase(&eventPhase);
+  if (eventPhase == nsIDOMEvent::CAPTURING_PHASE) {
+    if (aEvent->WidgetEventPtr()->mFlags.mInSystemGroup) {
+      HandleEventOnCaptureInSystemEventGroup(keyEvent);
+    } else {
+      HandleEventOnCaptureInDefaultEventGroup(keyEvent);
+    }
+    return NS_OK;
+  }
+
+  WidgetKeyboardEvent* widgetKeyboardEvent =
+    aEvent->WidgetEventPtr()->AsKeyboardEvent();
+  if (widgetKeyboardEvent->IsKeyEventOnPlugin()) {
+    // key events on plugin shouldn't execute shortcut key handlers which are
+    // not reserved.
+    if (!widgetKeyboardEvent->mIsReserved) {
+      return NS_OK;
+    }
+
+    // If the event is untrusted event or was already consumed, do nothing.
+    if (!widgetKeyboardEvent->IsTrusted() ||
+        widgetKeyboardEvent->DefaultPrevented()) {
+      return NS_OK;
+    }
+
+    // XXX Don't check isReserved here because even if the handler in this
+    //     instance isn't reserved but another instance reserves the key
+    //     combination, it will be executed when the event is normal keyboard
+    //     events...
+    bool isReserved = false;
+    if (!HasHandlerForEvent(keyEvent, &isReserved)) {
+      return NS_OK;
+    }
+  }
+
+  nsCOMPtr<nsIAtom> eventTypeAtom =
+    ConvertEventToDOMEventType(*widgetKeyboardEvent);
+  return WalkHandlers(keyEvent, eventTypeAtom);
+}
+
+void
+nsXBLWindowKeyHandler::HandleEventOnCaptureInDefaultEventGroup(
+                         nsIDOMKeyEvent* aEvent)
+{
+  WidgetKeyboardEvent* widgetKeyboardEvent =
+    aEvent->AsEvent()->WidgetEventPtr()->AsKeyboardEvent();
+
+  if (widgetKeyboardEvent->mIsReserved) {
+    MOZ_RELEASE_ASSERT(
+      widgetKeyboardEvent->mFlags.mOnlySystemGroupDispatchInContent);
+    MOZ_RELEASE_ASSERT(
+      widgetKeyboardEvent->mFlags.mNoCrossProcessBoundaryForwarding);
+    return;
+  }
+
+  bool isReserved = false;
+  if (HasHandlerForEvent(aEvent, &isReserved) && isReserved) {
+    widgetKeyboardEvent->mIsReserved = true;
+    // For reserved commands (such as Open New Tab), we don't to wait for
+    // the content to answer (so mWantReplyFromContentProcess remains false),
+    // neither to give a chance for content to override its behavior.
+    widgetKeyboardEvent->StopCrossProcessForwarding();
+    // If the key combination is reserved by chrome, we shouldn't expose the
+    // keyboard event to web contents because such keyboard events shouldn't be
+    // cancelable.  So, it's not good behavior to fire keyboard events but
+    // to ignore the defaultPrevented attribute value in chrome.
+    widgetKeyboardEvent->mFlags.mOnlySystemGroupDispatchInContent = true;
+  }
+}
+
+void
+nsXBLWindowKeyHandler::HandleEventOnCaptureInSystemEventGroup(
+                         nsIDOMKeyEvent* aEvent)
+{
+  WidgetKeyboardEvent* widgetEvent =
+    aEvent->AsEvent()->WidgetEventPtr()->AsKeyboardEvent();
+
+  if (widgetEvent->mFlags.mNoCrossProcessBoundaryForwarding ||
+      widgetEvent->mFlags.mOnlySystemGroupDispatchInContent) {
+    return;
+  }
+
+  nsCOMPtr<mozilla::dom::Element> originalTarget =
+    do_QueryInterface(aEvent->AsEvent()->WidgetEventPtr()->mOriginalTarget);
+  if (!EventStateManager::IsRemoteTarget(originalTarget)) {
+    return;
+  }
+
+  if (!HasHandlerForEvent(aEvent)) {
+    return;
+  }
+
+  // Inform the child process that this is a event that we want a reply
+  // from.
+  widgetEvent->mFlags.mWantReplyFromContentProcess = true;
+  // If this event hadn't been marked as mNoCrossProcessBoundaryForwarding
+  // yet, it means it wasn't processed by content. We'll not call any
+  // of the handlers at this moment, and will wait for the event to be
+  // redispatched with mNoCrossProcessBoundaryForwarding = 1 to process it.
+  // XXX Why not StopImmediatePropagation()?
+  aEvent->AsEvent()->StopPropagation();
+}
+
+bool
+nsXBLWindowKeyHandler::IsHTMLEditableFieldFocused()
+{
+  nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+  if (!fm)
+    return false;
+
+  nsCOMPtr<mozIDOMWindowProxy> focusedWindow;
+  fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
+  if (!focusedWindow)
+    return false;
+
+  auto* piwin = nsPIDOMWindowOuter::From(focusedWindow);
+  nsIDocShell *docShell = piwin->GetDocShell();
+  if (!docShell) {
+    return false;
+  }
+
+  nsCOMPtr<nsIEditor> editor;
+  docShell->GetEditor(getter_AddRefs(editor));
+  nsCOMPtr<nsIHTMLEditor> htmlEditor = do_QueryInterface(editor);
+  if (!htmlEditor) {
+    return false;
+  }
+
+  nsCOMPtr<nsIDOMDocument> domDocument;
+  editor->GetDocument(getter_AddRefs(domDocument));
+  nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDocument);
+  if (doc->HasFlag(NODE_IS_EDITABLE)) {
+    // Don't need to perform any checks in designMode documents.
+    return true;
+  }
+
+  nsCOMPtr<nsIDOMElement> focusedElement;
+  fm->GetFocusedElement(getter_AddRefs(focusedElement));
+  nsCOMPtr<nsINode> focusedNode = do_QueryInterface(focusedElement);
+  if (focusedNode) {
+    // If there is a focused element, make sure it's in the active editing host.
+    // Note that GetActiveEditingHost finds the current editing host based on
+    // the document's selection.  Even though the document selection is usually
+    // collapsed to where the focus is, but the page may modify the selection
+    // without our knowledge, in which case this check will do something useful.
+    nsCOMPtr<Element> activeEditingHost = htmlEditor->GetActiveEditingHost();
+    if (!activeEditingHost) {
+      return false;
+    }
+    return nsContentUtils::ContentIsDescendantOf(focusedNode, activeEditingHost);
+  }
+
+  return false;
+}
+
+//
+// WalkHandlersInternal and WalkHandlersAndExecute
+//
+// Given a particular DOM event and a pointer to the first handler in the list,
+// scan through the list to find something to handle the event. If aExecute = true,
+// the handler will be executed; otherwise just return an answer telling if a handler
+// for that event was found.
+//
+bool
+nsXBLWindowKeyHandler::WalkHandlersInternal(nsIDOMKeyEvent* aKeyEvent,
+                                            nsIAtom* aEventType, 
+                                            nsXBLPrototypeHandler* aHandler,
+                                            bool aExecute,
+                                            bool* aOutReservedForChrome)
+{
+  WidgetKeyboardEvent* nativeKeyboardEvent =
+    aKeyEvent->AsEvent()->WidgetEventPtr()->AsKeyboardEvent();
+  MOZ_ASSERT(nativeKeyboardEvent);
+
+  AutoShortcutKeyCandidateArray shortcutKeys;
+  nativeKeyboardEvent->GetShortcutKeyCandidates(shortcutKeys);
+
+  if (shortcutKeys.IsEmpty()) {
+    return WalkHandlersAndExecute(aKeyEvent, aEventType, aHandler,
+                                  0, IgnoreModifierState(),
+                                  aExecute, aOutReservedForChrome);
+  }
+
+  for (uint32_t i = 0; i < shortcutKeys.Length(); ++i) {
+    ShortcutKeyCandidate& key = shortcutKeys[i];
+    IgnoreModifierState ignoreModifierState;
+    ignoreModifierState.mShift = key.mIgnoreShift;
+    if (WalkHandlersAndExecute(aKeyEvent, aEventType, aHandler,
+                               key.mCharCode, ignoreModifierState,
+                               aExecute, aOutReservedForChrome)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool
+nsXBLWindowKeyHandler::WalkHandlersAndExecute(
+                         nsIDOMKeyEvent* aKeyEvent,
+                         nsIAtom* aEventType,
+                         nsXBLPrototypeHandler* aFirstHandler,
+                         uint32_t aCharCode,
+                         const IgnoreModifierState& aIgnoreModifierState,
+                         bool aExecute,
+                         bool* aOutReservedForChrome)
+{
+  if (aOutReservedForChrome) {
+    *aOutReservedForChrome = false;
+  }
+
+  WidgetKeyboardEvent* widgetKeyboardEvent =
+    aKeyEvent->AsEvent()->WidgetEventPtr()->AsKeyboardEvent();
+  if (NS_WARN_IF(!widgetKeyboardEvent)) {
+    return false;
+  }
+
+  // Try all of the handlers until we find one that matches the event.
+  for (nsXBLPrototypeHandler* handler = aFirstHandler;
+       handler;
+       handler = handler->GetNextHandler()) {
+    bool stopped = aKeyEvent->AsEvent()->IsDispatchStopped();
+    if (stopped) {
+      // The event is finished, don't execute any more handlers
+      return false;
+    }
+
+    if (aExecute) {
+      // If the event is eKeyDownOnPlugin, it should execute either keydown
+      // handler or keypress handler because eKeyDownOnPlugin events are
+      // never followed by keypress events.
+      if (widgetKeyboardEvent->mMessage == eKeyDownOnPlugin) {
+        if (!handler->EventTypeEquals(nsGkAtoms::keydown) &&
+            !handler->EventTypeEquals(nsGkAtoms::keypress)) {
+          continue;
+        }
+      // The other event types should exactly be matched with the handler's
+      // event type.
+      } else if (!handler->EventTypeEquals(aEventType)) {
+        continue;
+      }
+    } else {
+      if (handler->EventTypeEquals(nsGkAtoms::keypress)) {
+        // If the handler is a keypress event handler, we also need to check
+        // if coming keydown event is a preceding event of reserved key
+        // combination because if default action of a keydown event is
+        // prevented, following keypress event won't be fired.  However, if
+        // following keypress event is reserved, we shouldn't allow web
+        // contents to prevent the default of the preceding keydown event.
+        if (aEventType != nsGkAtoms::keydown &&
+            aEventType != nsGkAtoms::keypress) {
+          continue;
+        }
+      } else if (!handler->EventTypeEquals(aEventType)) {
+        // Otherwise, aEventType should exactly be matched.
+        continue;
+      }
+    }
+
+    // Check if the keyboard event *may* execute the handler.
+    if (!handler->KeyEventMatched(aKeyEvent, aCharCode, aIgnoreModifierState)) {
+      continue;  // try the next one
+    }
+
+    // Before executing this handler, check that it's not disabled,
+    // and that it has something to do (oncommand of the <key> or its
+    // <command> is non-empty).
+    nsCOMPtr<Element> commandElement;
+    if (!GetElementForHandler(handler, getter_AddRefs(commandElement))) {
+      continue;
+    }
+
+    bool isReserved = false;
+    if (commandElement) {
+      if (aExecute && !IsExecutableElement(commandElement)) {
+        continue;
+      }
+
+      isReserved =
+        commandElement->AttrValueIs(kNameSpaceID_None, nsGkAtoms::reserved,
+                                    nsGkAtoms::_true, eCaseMatters);
+      if (aOutReservedForChrome) {
+        *aOutReservedForChrome = isReserved;
+      }
+    }
+
+    if (!aExecute) {
+      if (handler->EventTypeEquals(aEventType)) {
+        return true;
+      }
+      // If the command is reserved and the event is keydown, check also if
+      // the handler is for keypress because if following keypress event is
+      // reserved, we shouldn't dispatch the event into web contents.
+      if (isReserved &&
+          aEventType == nsGkAtoms::keydown &&
+          handler->EventTypeEquals(nsGkAtoms::keypress)) {
+        return true;
+      }
+      // Otherwise, we've not found a handler for the event yet.
+      continue;
+    }
+
+    // If it's not reserved and the event is a key event on a plugin,
+    // the handler shouldn't be executed.
+    if (!isReserved && widgetKeyboardEvent->IsKeyEventOnPlugin()) {
+      return false;
+    }
+
+    nsCOMPtr<EventTarget> target;
+    nsCOMPtr<Element> chromeHandlerElement = GetElement();
+    if (chromeHandlerElement) {
+      // XXX commandElement may be nullptr...
+      target = commandElement;
+    } else {
+      target = mTarget;
+    }
+
+    // XXX Do we execute only one handler even if the handler neither stops
+    //     propagation nor prevents default of the event?
+    nsresult rv = handler->ExecuteHandler(target, aKeyEvent->AsEvent());
+    if (NS_SUCCEEDED(rv)) {
+      return true;
+    }
+  }
+
+#ifdef XP_WIN
+  // Windows native applications ignore Windows-Logo key state when checking
+  // shortcut keys even if the key is pressed.  Therefore, if there is no
+  // shortcut key which exactly matches current modifier state, we should
+  // retry to look for a shortcut key without the Windows-Logo key press.
+  if (!aIgnoreModifierState.mOS && widgetKeyboardEvent->IsOS()) {
+    IgnoreModifierState ignoreModifierState(aIgnoreModifierState);
+    ignoreModifierState.mOS = true;
+    return WalkHandlersAndExecute(aKeyEvent, aEventType, aFirstHandler,
+                                  aCharCode, ignoreModifierState, aExecute);
+  }
+#endif
+
+  return false;
+}
+
+bool
+nsXBLWindowKeyHandler::HasHandlerForEvent(nsIDOMKeyEvent* aEvent,
+                                          bool* aOutReservedForChrome)
+{
+  WidgetKeyboardEvent* widgetKeyboardEvent =
+    aEvent->AsEvent()->WidgetEventPtr()->AsKeyboardEvent();
+  if (NS_WARN_IF(!widgetKeyboardEvent) || !widgetKeyboardEvent->IsTrusted()) {
+    return false;
+  }
+
+  nsresult rv = EnsureHandlers();
+  NS_ENSURE_SUCCESS(rv, false);
+
+  bool isDisabled;
+  nsCOMPtr<Element> el = GetElement(&isDisabled);
+  if (el && isDisabled) {
+    return false;
+  }
+
+  nsCOMPtr<nsIAtom> eventTypeAtom =
+    ConvertEventToDOMEventType(*widgetKeyboardEvent);
+  return WalkHandlersInternal(aEvent, eventTypeAtom, mHandler, false,
+                              aOutReservedForChrome);
+}
+
+already_AddRefed<Element>
+nsXBLWindowKeyHandler::GetElement(bool* aIsDisabled)
+{
+  nsCOMPtr<Element> element = do_QueryReferent(mWeakPtrForElement);
+  if (element && aIsDisabled) {
+    *aIsDisabled = element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
+                                        nsGkAtoms::_true, eCaseMatters);
+  }
+  return element.forget();
+}
+
+bool
+nsXBLWindowKeyHandler::GetElementForHandler(nsXBLPrototypeHandler* aHandler,
+                                            Element** aElementForHandler)
+{
+  MOZ_ASSERT(aElementForHandler);
+  *aElementForHandler = nullptr;
+
+  nsCOMPtr<nsIContent> keyContent = aHandler->GetHandlerElement();
+  if (!keyContent) {
+    return true; // XXX Even though no key element?
+  }
+
+  nsCOMPtr<Element> chromeHandlerElement = GetElement();
+  if (!chromeHandlerElement) {
+    NS_WARNING_ASSERTION(keyContent->IsInUncomposedDoc(), "uncomposed");
+    nsCOMPtr<Element> keyElement = do_QueryInterface(keyContent);
+    keyElement.swap(*aElementForHandler);
+    return true;
+  }
+
+  // We are in a XUL doc.  Obtain our command attribute.
+  nsAutoString command;
+  keyContent->GetAttr(kNameSpaceID_None, nsGkAtoms::command, command);
+  if (command.IsEmpty()) {
+    // There is no command element associated with the key element.
+    NS_WARNING_ASSERTION(keyContent->IsInUncomposedDoc(), "uncomposed");
+    nsCOMPtr<Element> keyElement = do_QueryInterface(keyContent);
+    keyElement.swap(*aElementForHandler);
+    return true;
+  }
+
+  // XXX Shouldn't we check this earlier?
+  nsIDocument* doc = keyContent->GetUncomposedDoc();
+  if (NS_WARN_IF(!doc)) {
+    return false;
+  }
+
+  nsCOMPtr<Element> commandElement =
+    do_QueryInterface(doc->GetElementById(command));
+  if (!commandElement) {
+    NS_ERROR("A XUL <key> is observing a command that doesn't exist. "
+             "Unable to execute key binding!");
+    return false;
+  }
+
+  commandElement.swap(*aElementForHandler);
+  return true;
+}
+
+bool
+nsXBLWindowKeyHandler::IsExecutableElement(Element* aElement) const
+{
+  if (!aElement) {
+    return false;
+  }
+
+  nsAutoString value;
+  aElement->GetAttribute(NS_LITERAL_STRING("disabled"), value);
+  if (value.EqualsLiteral("true")) {
+    return false;
+  }
+
+  aElement->GetAttribute(NS_LITERAL_STRING("oncommand"), value);
+  if (value.IsEmpty()) {
+    return false;
+  }
+
+  return true;
+}
+
+///////////////////////////////////////////////////////////////////////////////////
+
+already_AddRefed<nsXBLWindowKeyHandler>
+NS_NewXBLWindowKeyHandler(nsIDOMElement* aElement, EventTarget* aTarget)
+{
+  RefPtr<nsXBLWindowKeyHandler> result =
+    new nsXBLWindowKeyHandler(aElement, aTarget);
+  return result.forget();
+}
diff --git a/dom/xbl/nsXBLWindowKeyHandler.h b/dom/xbl/nsXBLWindowKeyHandler.h
new file mode 100644
index 0000000000..0509e85e46
--- /dev/null
+++ b/dom/xbl/nsXBLWindowKeyHandler.h
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsXBLWindowKeyHandler_h__
+#define nsXBLWindowKeyHandler_h__
+
+#include "mozilla/EventForwards.h"
+#include "nsWeakPtr.h"
+#include "nsIDOMEventListener.h"
+
+class nsIAtom;
+class nsIDOMElement;
+class nsIDOMKeyEvent;
+class nsXBLSpecialDocInfo;
+class nsXBLPrototypeHandler;
+
+namespace mozilla {
+class EventListenerManager;
+namespace dom {
+class Element;
+class EventTarget;
+struct IgnoreModifierState;
+} // namespace dom
+} // namespace mozilla
+
+class nsXBLWindowKeyHandler : public nsIDOMEventListener
+{
+  typedef mozilla::dom::IgnoreModifierState IgnoreModifierState;
+  typedef mozilla::EventListenerManager EventListenerManager;
+
+public:
+  nsXBLWindowKeyHandler(nsIDOMElement* aElement, mozilla::dom::EventTarget* aTarget);
+
+  void InstallKeyboardEventListenersTo(
+         EventListenerManager* aEventListenerManager);
+  void RemoveKeyboardEventListenersFrom(
+         EventListenerManager* aEventListenerManager);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIDOMEVENTLISTENER
+
+protected:
+  virtual ~nsXBLWindowKeyHandler();
+
+  nsresult WalkHandlers(nsIDOMKeyEvent* aKeyEvent, nsIAtom* aEventType);
+
+  // walk the handlers, looking for one to handle the event
+  bool WalkHandlersInternal(nsIDOMKeyEvent* aKeyEvent,
+                            nsIAtom* aEventType,
+                            nsXBLPrototypeHandler* aHandler,
+                            bool aExecute,
+                            bool* aOutReservedForChrome = nullptr);
+
+  // walk the handlers for aEvent, aCharCode and aIgnoreModifierState. Execute
+  // it if aExecute = true.
+  bool WalkHandlersAndExecute(nsIDOMKeyEvent* aKeyEvent, nsIAtom* aEventType,
+                              nsXBLPrototypeHandler* aHandler,
+                              uint32_t aCharCode,
+                              const IgnoreModifierState& aIgnoreModifierState,
+                              bool aExecute,
+                              bool* aOutReservedForChrome = nullptr);
+
+  // HandleEvent function for the capturing phase in the default event group.
+  void HandleEventOnCaptureInDefaultEventGroup(nsIDOMKeyEvent* aEvent);
+  // HandleEvent function for the capturing phase in the system event group.
+  void HandleEventOnCaptureInSystemEventGroup(nsIDOMKeyEvent* aEvent);
+
+  // Check if any handler would handle the given event. Optionally returns
+  // whether the command handler for the event is marked with the "reserved"
+  // attribute.
+  bool HasHandlerForEvent(nsIDOMKeyEvent* aEvent,
+                          bool* aOutReservedForChrome = nullptr);
+
+  // Returns event type for matching between aWidgetKeyboardEvent and
+  // shortcut key handlers.  This is used for calling WalkHandlers(),
+  // WalkHandlersInternal() and WalkHandlersAndExecute().
+  nsIAtom* ConvertEventToDOMEventType(
+             const mozilla::WidgetKeyboardEvent& aWidgetKeyboardEvent) const;
+
+  // lazily load the handlers. Overridden to handle being attached
+  // to a particular element rather than the document
+  nsresult EnsureHandlers();
+
+  // Is an HTML editable element focused
+  bool IsHTMLEditableFieldFocused();
+
+  // Returns the element which was passed as a parameter to the constructor,
+  // unless the element has been removed from the document. Optionally returns
+  // whether the disabled attribute is set on the element (assuming the element
+  // is non-null).
+  already_AddRefed<mozilla::dom::Element> GetElement(bool* aIsDisabled = nullptr);
+
+  /**
+   * GetElementForHandler() retrieves an element for the handler.  The element
+   * may be a command element or a key element.
+   *
+   * @param aHandler           The handler.
+   * @param aElementForHandler Must not be nullptr.  The element is returned to
+   *                           this.
+   * @return                   true if the handler is valid.  Otherwise, false.
+   */
+  bool GetElementForHandler(nsXBLPrototypeHandler* aHandler,
+                            mozilla::dom::Element** aElementForHandler);
+
+  /**
+   * IsExecutableElement() returns true if aElement is executable.
+   * Otherwise, false. aElement should be a command element or a key element.
+   */
+  bool IsExecutableElement(mozilla::dom::Element* aElement) const;
+
+  // Using weak pointer to the DOM Element.
+  nsWeakPtr              mWeakPtrForElement;
+  mozilla::dom::EventTarget* mTarget; // weak ref
+
+  // these are not owning references; the prototype handlers are owned
+  // by the prototype bindings which are owned by the docinfo.
+  nsXBLPrototypeHandler* mHandler;     // platform bindings
+  nsXBLPrototypeHandler* mUserHandler; // user-specific bindings
+
+  // holds document info about bindings
+  static nsXBLSpecialDocInfo* sXBLSpecialDocInfo;
+  static uint32_t sRefCnt;
+};
+
+already_AddRefed<nsXBLWindowKeyHandler>
+NS_NewXBLWindowKeyHandler(nsIDOMElement* aElement,
+                          mozilla::dom::EventTarget* aTarget);
+
+#endif
diff --git a/dom/xbl/test/bug310107-resource.xhtml b/dom/xbl/test/bug310107-resource.xhtml
new file mode 100644
index 0000000000..2a3f1df358
--- /dev/null
+++ b/dom/xbl/test/bug310107-resource.xhtml
@@ -0,0 +1,21 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <style>
+      #bar {
+        -moz-binding: url("#binding");
+      }
+    </style>
+    <bindings xmlns="http://www.mozilla.org/xbl">
+      <binding id="binding">
+        <implementation>
+          <property name="prop" readonly="true" exposeToUntrustedContent="true"
+            onget="return 2;"/>
+        </implementation>
+      </binding>
+    </bindings>
+  </head>
+  <!-- Use a timeout so that we get bfcached -->
+  <body onload="setTimeout(window.opener.runTest, 100)">
+    <div id="bar"></div>
+  </body>
+</html>
diff --git a/dom/xbl/test/chrome.ini b/dom/xbl/test/chrome.ini
new file mode 100644
index 0000000000..40606de12c
--- /dev/null
+++ b/dom/xbl/test/chrome.ini
@@ -0,0 +1,15 @@
+[DEFAULT]
+support-files =
+  file_bug944407.xml
+  file_bug950909.xml
+  file_fieldScopeChain.xml
+
+[test_bug378518.xul]
+[test_bug398135.xul]
+[test_bug398492.xul]
+[test_bug721452.xul]
+[test_bug723676.xul]
+[test_bug772966.xul]
+[test_bug944407.xul]
+[test_bug950909.xul]
+[test_fieldScopeChain.html]
diff --git a/dom/xbl/test/file_bug372769.xhtml b/dom/xbl/test/file_bug372769.xhtml
new file mode 100644
index 0000000000..79a36be854
--- /dev/null
+++ b/dom/xbl/test/file_bug372769.xhtml
@@ -0,0 +1,181 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=372769
+-->
+<head>
+  <title>Test for Bug 372769</title>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test1">
+      <implementation>
+        <field name="one">1</field>
+        <field name="two">9</field>
+        <field name="three">3</field>
+        <field name="four">10</field>
+        <field name="five">11</field>
+        <field name="six">this.four = 4; 6;</field>
+        <field name="seven">this.five = 5; 7;</field>
+      </implementation>
+    </binding>
+
+    <binding id="test2">
+      <implementation>
+        <!-- Tests for recursive resolves -->
+        <field name="eight">this.eight</field>
+        <field name="nine">this.ten</field>
+        <field name="ten">this.nine</field>
+        <!-- Tests for non-DOM overrides -->
+        <field name="eleven">11</field>
+        <field name="twelve">12</field>
+        <!-- Tests for DOM overrides -->
+        <field name="parentNode">this.parentNode</field>
+        <field name="ownerDocument">"ownerDocument override"</field>
+      </implementation>
+    </binding>
+
+    <binding id="test3-ancestor">
+      <implementation>
+        <field name="thirteen">"13 ancestor"</field>
+        <field name="fourteen">"14 ancestor"</field>
+        <property name="fifteen" readonly="true" onget="return '15 ancestor'"/>
+      </implementation>
+    </binding>
+
+    <binding id="test3" extends="#test3-ancestor">
+      <implementation>
+        <field name="thirteen">13</field>
+        <field name="fifteen">15</field>
+        <field name="sixteen">16</field>
+        <field name="sixteen">"16 later"</field>
+        <field name="seventeen">17</field>
+        <field name="eighteen">"18 field"</field>
+        <property name="eighteen" readonly="true" onget="return 18"/>
+        <property name="nineteen" readonly="true" onget="return 19"/>
+        <field name="nineteen">"19 field"</field>
+      </implementation>
+    </binding>
+
+    <binding id="test4">
+      <implementation>
+        <field name="twenty">for (var i in this) ; 20;</field>
+      </implementation>
+    </binding>
+
+      <binding id="test5">
+      <implementation>
+        <field name="twenty-one">for (var i in this) ; 21;</field>
+      </implementation>
+    </binding>
+</bindings>  
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=372769">Mozilla Bug 372769</a>
+<p id="display1" style="-moz-binding: url(#test1)"></p>
+<p id="display2" style="-moz-binding: url(#test2)"></p>
+<p id="display3" style="-moz-binding: url(#test3)"></p>
+<p id="display4" style="-moz-binding: url(#test4)"></p>
+<p id="display5" style="-moz-binding: url(#test5)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+/** Test for Bug 372769 **/
+
+SimpleTest = parent.SimpleTest;
+ok = parent.ok;
+is = parent.is;
+$ = function(x) { return document.getElementById(x); }
+
+window.onload = function() {
+  var d = $("display1");
+  is(d.one, 1, "Should be able to read field");
+
+  d.two = 2;
+  is(d.two, 2, "Should be able to write field");
+
+  is("three" in d, true, 'Should have a property named "three"');
+  is(d.three, 3, "Should be 3");
+
+  is(d.four, 10, "Unexpected value so far");
+
+  // Save "five" for now
+
+  is(d.six, 6, "Should be 6");
+
+  is(d.four, 4, "Now should be 4");
+
+  d.four = 9;
+  is(d.four, 9, "Just set it to 9");
+  
+  var found = false;
+  for (var prop in d) {
+    if (prop == "seven") {
+      found = true;
+      break;
+    }
+  }
+  is(found, true, "Enumeration is broken");
+
+  is(d.four, 9, "Shouldn't have rerun field six");
+  is(d.five, 11, "Shouldn't have run field 7");
+  is(d.seven, 7, "Should be 7")
+  is(d.five, 5, "Should have run field 7");
+
+  d = $("display2");
+  is(typeof(d.eight), "undefined", "Recursive resolve should bail out");
+  is(typeof(d.nine), "undefined", "Recursive double resolve should bail out");
+  is(typeof(d.ten), "undefined",
+     "This recursive double resolve should bail out too");
+
+  // Get .eleven so it's resolved now
+  is(d.eleven, 11, "Unexpected value for .eleven");
+  var newProto = {};
+  newProto.eleven = "Proto 11";
+  newProto.twelve = "Proto 12";  
+  newProto.__proto__ = d.__proto__;
+  d.__proto__ = newProto;
+  is(d.eleven, 11, "Proto should not have affected this");
+  is(d.twelve, "Proto 12", "Proto should have overridden 'twelve'");
+  
+  is(d.parentNode, undefined, "We overrode this, yes we did");
+  is(typeof(d.parentNode), "undefined", "This is a recursive resolve too");
+  is(d.ownerDocument, "ownerDocument override",
+     "Should have overridden ownerDocument");
+
+  d = $("display3");
+  is(d.thirteen, 13, "descendant should win here");
+  is(d.fourteen, "14 ancestor",
+     "ancestor should win if descendant does nothing")
+  is(d.fifteen, 15,
+     "Field beats ancestor's property, since the latter lives on higher proto")
+  is(d.sixteen, 16, "First field wins");
+  is(d.__proto__.seventeen, undefined, "Shouldn't have this on proto");
+  is(typeof(d.__proto__.seventeen), "undefined",
+     "Really, should be undefined");
+  is(d.seventeen, 17, "Should have this prop on the node itself, though");
+  is(d.eighteen, 18, "Property beats field");
+  is(d.nineteen, 19, "Property still beats field");
+
+  d = $("display4");
+  is(d.twenty, 20, "Should be 20");
+
+  d = $("display5");
+  found = false;
+  for (var prop2 in d) {
+    if (prop2 == "twenty-one") {
+      found = true;
+      break;
+    }
+  }
+  is(found, true, "Enumeration is broken");
+  is(d["twenty-one"], 21, "Should be 21");
+  SimpleTest.finish();
+}
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/file_bug379959_cross.html b/dom/xbl/test/file_bug379959_cross.html
new file mode 100644
index 0000000000..80e2be97d4
--- /dev/null
+++ b/dom/xbl/test/file_bug379959_cross.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<style>
+#div1 {
+  color: green;
+  -moz-binding: url(file_bug379959_xbl.xml#xbltest);
+}
+#div2 {
+  color: green;
+  -moz-binding: url(http://example.com/tests/dom/xbl/test/file_bug379959_xbl.xml#xbltest);
+}
+</style>
+<body>
+<div id="div1"></div>
+<div id="div2"></div>
+<script>
+onload = function() {
+  // same origin should be allowed
+  var nodes1 = SpecialPowers.wrap(document).getAnonymousNodes(document.getElementById('div1'));
+  parent.postMessage({test: "sameOriginIsAllowed",
+                      result: nodes1 ? nodes1.length : 0,
+                      senderURL: "http://mochi.test:8888"}, "*");
+
+  // cross origin should be blocked
+  var nodes2 = SpecialPowers.wrap(document).getAnonymousNodes(document.getElementById('div2'));
+  parent.postMessage({test: "crossOriginIsBlocked",
+                      result: nodes2 ? nodes2.length : 0,
+                      senderURL: "http://mochi.test:8888"}, "*");
+}
+</script>
+</html>
diff --git a/dom/xbl/test/file_bug379959_data.html b/dom/xbl/test/file_bug379959_data.html
new file mode 100644
index 0000000000..64fe3e45a7
--- /dev/null
+++ b/dom/xbl/test/file_bug379959_data.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<style>
+#d {
+  color: green;
+  -moz-binding: url(data:text/xml;charset=utf-8,%3C%3Fxml%20version%3D%221.0%22%3F%3E%0A%3Cbindings%20id%3D%22xbltestBindings%22%20xmlns%3D%22http%3A//www.mozilla.org/xbl%22%3E%0A%20%20%3Cbinding%20id%3D%22xbltest%22%3E%3Ccontent%3EPASS%3C/content%3E%3C/binding%3E%0A%3C/bindings%3E%0A);
+}
+</style>
+<body>
+<div id="d"></div>
+<script>
+onload = function() {
+  var nodes = SpecialPowers.wrap(document).getAnonymousNodes(document.getElementById('d'));
+  parent.postMessage({test: "dataIsAllowed",
+                      result: nodes ? nodes.length : 0,
+                      senderURL: "http://mochi.test:8888"}, "*");
+}
+</script>
+</html>
diff --git a/dom/xbl/test/file_bug379959_xbl.xml b/dom/xbl/test/file_bug379959_xbl.xml
new file mode 100644
index 0000000000..c791a2e2b4
--- /dev/null
+++ b/dom/xbl/test/file_bug379959_xbl.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0"?>

+<bindings id="xbltestBindings" xmlns="http://www.mozilla.org/xbl">

+  <binding id="xbltest"><content>PASS</content></binding>

+</bindings>

diff --git a/dom/xbl/test/file_bug397934.xhtml b/dom/xbl/test/file_bug397934.xhtml
new file mode 100644
index 0000000000..c8505aab47
--- /dev/null
+++ b/dom/xbl/test/file_bug397934.xhtml
@@ -0,0 +1,117 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=397934
+-->
+<head>
+  <title>Test for Bug 397934</title>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="ancestor">
+      <implementation>
+        <field name="testAncestor">"ancestor"</field>
+      </implementation>
+    </binding>
+    <binding id="test1" extends="#ancestor">
+      <implementation>
+        <constructor>
+          this.storage = window;
+        </constructor>
+        <field name="window"></field>
+        <field name="storage">null</field>
+        <field name="parentNode"></field>
+        <field name="ownerDocument">"ownerDocument"</field>
+        <field name="emptyTest1"></field>
+        <field name="emptyTest1">"empty1"</field>
+        <field name="emptyTest2">"empty2"</field>        
+        <field name="emptyTest2"></field>
+        <field name="testAncestor"></field>
+        <field name="testEvalOnce">XPCNativeWrapper.unwrap(window).counter++; undefined</field>
+      </implementation>
+    </binding>
+    <binding id="test2" extends="#ancestor">
+      <implementation>
+        <constructor>
+          this.storage = window;
+        </constructor>
+        <field name="window">undefined</field>
+        <field name="storage">null</field>
+        <field name="parentNode">undefined</field>
+        <field name="ownerDocument">"ownerDocument"</field>
+        <field name="emptyTest1">undefined</field>
+        <field name="emptyTest1">"empty1"</field>
+        <field name="emptyTest2">"empty2"</field>        
+        <field name="emptyTest2">undefined</field>
+        <field name="testAncestor">undefined</field>
+      </implementation>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=397934">Mozilla Bug 397934</a>
+<p id="display1" style="-moz-binding: url(#test1)"></p>
+<p id="display2" style="-moz-binding: url(#test2)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+/** Test for Bug 397934 **/
+SimpleTest = parent.SimpleTest;
+ok = parent.ok;
+is = parent.is;
+$ = function(x) { return document.getElementById(x); }
+window.onload = function() {
+  var d;
+  d = $("display1");
+  is(d.storage, window,
+     "test1" +
+       ": |window| in the constructor should have resolved to our window");
+  is(d.ownerDocument, "ownerDocument",
+     "test1" + ": Control to test field overriding DOM prop");
+  is(d.parentNode, document.body, "test1" + ": unexpected parent");
+  is(d.emptyTest1, undefined,
+     "test1" + ": First field wins even if undefined");
+  is(typeof(d.emptyTest1), "undefined",
+     "test1" + ": First field wins even if undefined, double-check");
+  is(d.emptyTest2, "empty2",
+     "test1" + ": First field wins");
+  is(d.testAncestor, "ancestor",
+     "test1" + ": Empty field should not override ancestor binding");
+
+  var win = window;
+  win.counter = 0;
+  d.testEvalOnce;
+  d.testEvalOnce;
+  is(win.counter, 1, "Field should have evaluated once and only once");
+
+  d = $("display2");
+  is(d.storage, undefined,
+     "test2" +
+       ": |window| in the constructor should have resolved to undefined");
+  is(typeof(d.storage), "undefined",
+     "test2" +
+       ": |window| in the constructor should really have resolved to undefined");
+  is(d.ownerDocument, "ownerDocument",
+     "test2" + ": Control to test field overriding DOM prop");
+  is(d.parentNode, undefined, "test2" + ": unexpected parent");
+  is(typeof(d.parentNode), "undefined", "test2" + ": unexpected parent for real");
+  is(d.emptyTest1, undefined,
+     "test2" + ": First field wins even if undefined");
+  is(typeof(d.emptyTest1), "undefined",
+     "test2" + ": First field wins even if undefined, double-check");
+  is(d.emptyTest2, "empty2",
+     "test2" + ": First field wins");
+  is(d.testAncestor, undefined,
+     "test2" + ": Undefined field should override ancestor binding");
+  is(typeof(d.testAncestor), "undefined",
+     "test2" + ": Undefined field should really override ancestor binding");
+  SimpleTest.finish();
+}
+
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/file_bug481558.xbl b/dom/xbl/test/file_bug481558.xbl
new file mode 100644
index 0000000000..f9ae7be1c9
--- /dev/null
+++ b/dom/xbl/test/file_bug481558.xbl
@@ -0,0 +1,14 @@
+<bindings xmlns="http://www.mozilla.org/xbl"
+          xmlns:xbl="http://www.mozilla.org/xbl"
+          xmlns:html="http://www.w3.org/1999/xhtml">
+<binding id="test">
+  <content>
+    <children/>
+    Binding Attached
+  </content>
+  <implementation>
+    <property name="xblBoundProperty" onget="return 1;"
+              exposeToUntrustedContent="true"/>
+  </implementation>
+</binding>
+</bindings>
diff --git a/dom/xbl/test/file_bug481558css.sjs b/dom/xbl/test/file_bug481558css.sjs
new file mode 100644
index 0000000000..a44cb9c956
--- /dev/null
+++ b/dom/xbl/test/file_bug481558css.sjs
@@ -0,0 +1,17 @@
+function handleRequest(request, response)
+{
+  var query = {};
+  request.queryString.split('&').forEach(function (val) {
+    [name, value] = val.split('=');
+    query[name] = unescape(value);
+  });
+
+  response.setHeader("Content-Type", "text/css", false);
+  css = "#" + query.id + " { -moz-binding: url(\"";
+  if (query.server) {
+    css += "http://" + query.server + "/tests/dom/xbl/test/";
+  }
+  css += "file_bug481558.xbl#test\"); }";
+
+  response.write(css);
+}
diff --git a/dom/xbl/test/file_bug591198_inner.html b/dom/xbl/test/file_bug591198_inner.html
new file mode 100644
index 0000000000..89b547a39f
--- /dev/null
+++ b/dom/xbl/test/file_bug591198_inner.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <style>
+      #b {
+        -moz-binding: url("file_bug591198_xbl.xml#xbltest");
+      }
+      span {
+        white-space: nowrap;
+      }
+    </style>
+    <script>
+function sendResults() {
+  var res = {
+    widths: []
+  };
+
+  ps = document.getElementsByTagName('span');
+  for (var i = 0; i < ps.length; i++) {
+    res.widths.push(ps[i].offsetWidth);
+  }
+  
+  try {
+    res.anonChildCount =
+      SpecialPowers.wrap(document).getAnonymousNodes(document.getElementById('b')).length;
+  }
+  catch (ex) {}
+
+  parent.postMessage(JSON.stringify(res), "*");
+}
+    </script>
+  </head>
+  <body onload="sendResults();">
+    <div><span id=b>long long text here</span></div>
+    <div><span>long long text here</span></div>
+    <div><span>PASS</span></div>
+  </body>
+</html>
diff --git a/dom/xbl/test/file_bug591198_xbl.xml b/dom/xbl/test/file_bug591198_xbl.xml
new file mode 100644
index 0000000000..f69959b47c
--- /dev/null
+++ b/dom/xbl/test/file_bug591198_xbl.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0"?>

+<bindings id="xbltestBindings" xmlns="http://www.mozilla.org/xbl"

+          xmlns:html="http://www.w3.org/1999/xhtml">

+  <binding id="xbltest"><content>PASS<html:b style="display:none"><children/></html:b></content></binding>

+</bindings>

diff --git a/dom/xbl/test/file_bug821850.xhtml b/dom/xbl/test/file_bug821850.xhtml
new file mode 100644
index 0000000000..0d68a908f8
--- /dev/null
+++ b/dom/xbl/test/file_bug821850.xhtml
@@ -0,0 +1,299 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=821850
+-->
+<head>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="testBinding">
+      <implementation>
+        <constructor>
+          // Store a property as an expando on the bound element.
+          this._prop = "propVal";
+
+          // Wait for both constructors to fire.
+          window.constructorCount = (window.constructorCount + 1) || 1;
+          if (window.constructorCount != 3)
+            return;
+
+          // Grab some basic infrastructure off the content window.
+          var win = XPCNativeWrapper.unwrap(window);
+          SpecialPowers = win.SpecialPowers;
+          Cu = SpecialPowers.Cu;
+          is = win.is;
+          ok = win.ok;
+          SimpleTest = win.SimpleTest;
+
+          // Stick some expandos on the content window.
+          window.xrayExpando = 3;
+          win.primitiveExpando = 11;
+          win.stringExpando = "stringExpando";
+          win.objectExpando = { foo: 12 };
+          win.globalExpando = SpecialPowers.unwrap(Cu.getGlobalForObject({}));
+          win.functionExpando = function() { return "called" };
+          win.functionExpando.prop = 2;
+
+          // Make sure we're Xraying.
+          ok(Cu.isXrayWrapper(window), "Window is Xrayed");
+          ok(Cu.isXrayWrapper(document), "Document is Xrayed");
+
+          var bound = document.getElementById('bound');
+          var bound2 = document.getElementById('bound2');
+          var bound3 = document.getElementById('bound3');
+          ok(bound, "bound is non-null");
+          is(bound.method('baz'), "method:baz", "Xray methods work");
+          is(bound.prop, "propVal", "Property Xrays work");
+          is(bound.primitiveField, undefined, "Xrays don't show fields");
+          is(bound.wrappedJSObject.primitiveField, 2, "Waiving Xrays show fields");
+
+          // Check exposure behavior.
+          is(typeof bound.unexposedMethod, 'function',
+             "Unexposed method should be visible to XBL");
+          is(typeof bound.wrappedJSObject.unexposedMethod, 'undefined',
+             "Unexposed method should not be defined in content");
+          is(typeof bound.unexposedProperty, 'number',
+             "Unexposed property should be visible to XBL");
+          is(typeof bound.wrappedJSObject.unexposedProperty, 'undefined',
+             "Unexposed property should not be defined in content");
+
+          // Check that here HTMLImageElement.QueryInterface works
+          var img = document.querySelector("img");
+          ok("QueryInterface" in img,
+             "Should have a img.QueryInterface here");
+          is(img.QueryInterface(Components.interfaces.nsIImageLoadingContent),
+             img, "Should be able to QI the image");
+
+          // Make sure standard constructors work right in the presence of
+          // sandboxPrototype and Xray-resolved constructors.
+          is(window.Function, XPCNativeWrapper(window.wrappedJSObject.Function),
+             "window.Function comes from the window, not the global");
+          ok(Function != window.Function, "Function constructors are distinct");
+          is(Object.getPrototypeOf(Function.prototype), Object.getPrototypeOf({foo: 42}),
+             "Function constructor is local");
+
+          ok(Object.getPrototypeOf(bound.wrappedJSObject) == Object.getPrototypeOf(bound2.wrappedJSObject),
+             "Div and div should have the same content-side prototype");
+          ok(Object.getPrototypeOf(bound.wrappedJSObject) != Object.getPrototypeOf(bound3.wrappedJSObject),
+             "Div and span should have different content-side prototypes");
+          ok(bound.wrappedJSObject.method == bound3.wrappedJSObject.method,
+             "Methods should be shared");
+
+          // This gets invoked by an event handler.
+          window.finish = function() {
+            // Content messed with stuff. Make sure we still see the right thing.
+            is(bound.method('bay'), "method:bay", "Xray methods work");
+            is(bound.wrappedJSObject.method('bay'), "hah", "Xray waived methods work");
+            is(bound.prop, "set:someOtherVal", "Xray props work");
+            is(bound.wrappedJSObject.prop, "redefined", "Xray waived props work");
+            is(bound.wrappedJSObject.primitiveField, 321, "Can't do anything about redefined fields");
+
+            SimpleTest.finish();
+          }
+
+          // Hand things off to content. Content will call us back.
+          win.go();
+        </constructor>
+        <field name="primitiveField">2</field>
+        <method name="unexposedMethod"><body></body></method>
+        <property name="unexposedProperty" onget="return 2;" readonly="true"></property>
+        <method name="method" exposeToUntrustedContent="true">
+          <parameter name="arg" />
+          <body>
+            return "method:" + arg;
+          </body>
+        </method>
+        <method name="passMeAJSObject" exposeToUntrustedContent="true">
+          <parameter name="arg" />
+          <body>
+            is(typeof arg.prop, 'undefined', "No properties");
+            is(arg.wrappedJSObject.prop, 2, "Underlying object has properties");
+            is(Object.getOwnPropertyNames(arg).length, 0, "Should have no own properties");
+            is(Object.getOwnPropertyNames(arg.wrappedJSObject).length, 1, "Underlying object has properties");
+            arg.foo = 2;
+            is(arg.foo, 2, "Should place expandos");
+            is(typeof arg.wrappedJSObject.foo, 'undefined', "Expandos should be invisible to content");
+          </body>
+        </method>
+        <property name="prop" exposeToUntrustedContent="true">
+          <getter>return this._prop;</getter>
+          <setter>this._prop = "set:" + val;</setter>
+        </property>
+      </implementation>
+      <handlers>
+        <handler event="testevent" action="ok(true, 'called event handler'); finish();" allowuntrusted="true"/>
+        <handler event="testtrusted" action="ok(true, 'called trusted handler'); window.wrappedJSObject.triggeredTrustedHandler = true;"/>
+        <handler event="keyup" action="ok(true, 'called untrusted key handler'); window.wrappedJSObject.triggeredUntrustedKeyHandler = true;" allowuntrusted="true"/>
+        <handler event="keydown" action="ok(true, 'called trusted key handler'); window.wrappedJSObject.triggeredTrustedKeyHandler = true;"/>
+      </handlers>
+    </binding>
+  </bindings>
+  <script type="application/javascript">
+  <![CDATA[
+
+  ok = parent.ok;
+  is = parent.is;
+  SimpleTest = parent.SimpleTest;
+  SpecialPowers = parent.SpecialPowers;
+
+  // Test the Xray waiving behavior when accessing fields. We should be able to
+  // see sequential JS-implemented properties, but should regain Xrays when we
+  // hit a native property.
+  window.contentVal = { foo: 10, rabbit: { hole: { bar: 100, win: window} } };
+  ok(true, "Set contentVal");
+
+  // Check that we're not exposing QueryInterface to non-XBL code
+  ok(!("QueryInterface" in document),
+     "Should not have a document.QueryInterface here");
+
+  function go() {
+    "use strict";
+
+    // Test what we can and cannot access in the XBL scope.
+    is(typeof window.xrayExpando, "undefined", "Xray expandos are private to the caller");
+    is(window.primitiveExpando, 11, "Can see waived expandos");
+    is(window.stringExpando, "stringExpando", "Can see waived expandos");
+    is(typeof window.objectExpando, "object", "object expando exists");
+    checkThrows(() => window.objectExpando.foo);
+    is(SpecialPowers.wrap(window.objectExpando).foo, 12, "SpecialPowers sees the right thing");
+    is(typeof window.globalExpando, "object", "Can see global object");
+    checkThrows(() => window.globalExpando.win);
+    is(window.functionExpando(), "called", "XBL functions are callable");
+    checkThrows(() => window.functionExpando.prop);
+
+    // Inspect the bound element.
+    var bound = document.getElementById('bound');
+    is(bound.primitiveField, 2, "Can see primitive fields");
+    is(bound.method("foo"), "method:foo", "Can invoke XBL method from content");
+    is(bound.prop, "propVal", "Can access properties from content");
+    bound.prop = "someOtherVal";
+    is(bound.prop, "set:someOtherVal", "Can set properties from content");
+
+    // Make sure that XBL scopes get opaque wrappers.
+    //
+    // Note: Now that we have object Xrays, we have to pass in a more obscure
+    // ES type that we don't Xray to test this.
+    var proto = bound.__proto__;
+    var nonXrayableObject = new WeakMap();
+    nonXrayableObject.prop = 2;
+    proto.passMeAJSObject(nonXrayableObject);
+
+    //
+    // Try sticking a bunch of stuff on the prototype object.
+    //
+
+    proto.someExpando = 201;
+    is(bound.someExpando, 201, "Can stick non-XBL properties on the proto");
+
+    // Previously, this code checked that content couldn't tamper with its XBL
+    // prototype. But we decided to allow this to reduce regression risk, so for
+    // now just check that this works.
+    function checkMayTamper(obj, propName, desc) {
+      var accessor = !('value' in Object.getOwnPropertyDescriptor(obj, propName));
+      if (!accessor)
+        checkAllowed(function() { obj[propName] = function() {} }, desc + ": assign");
+      checkAllowed(function() { Object.defineProperty(obj, propName, {configurable: true, value: 3}) }, desc + ": define with value");
+      checkAllowed(function() { Object.defineProperty(obj, propName, {configurable: true, writable: true}) }, desc + ": make writable");
+      checkAllowed(function() { Object.defineProperty(obj, propName, {configurable: true}) }, desc + ": make configurable");
+      checkAllowed(function() { Object.defineProperty(obj, propName, {configurable: true, get: function() {}}) }, desc + ": define with getter");
+      checkAllowed(function() { Object.defineProperty(obj, propName, {configurable: true, set: function() {}}) }, desc + ": define with setter");
+
+      // Windows are implemented as proxies, and Proxy::delete_ doesn't currently
+      // pass strict around. Work around it in the window.binding case by just
+      // checking if delete returns false.
+      // manually.
+      checkAllowed(function() { delete obj[propName]; }, desc + ": delete");
+
+      if (!accessor)
+        checkAllowed(function() { obj[propName] = function() {} }, desc + ": assign (again)");
+    }
+
+    // Make sure content can do whatever it wants with the prototype.
+    checkMayTamper(proto, 'method', "XBL Proto Method");
+    checkMayTamper(proto, 'prop', "XBL Proto Prop");
+    checkMayTamper(proto, 'primitiveField', "XBL Field Accessor");
+
+    // Tamper with the derived object. This doesn't affect the XBL scope thanks
+    // to Xrays.
+    bound.method = function() { return "heh"; };
+    Object.defineProperty(bound, 'method', {value: function() { return "hah" }});
+    Object.defineProperty(bound, 'prop', {value: "redefined"});
+    bound.primitiveField = 321;
+
+    // Untrusted events should not trigger event handlers without
+    // exposeToUntrustedContent=true.
+    window.triggeredTrustedHandler = false;
+    var untrustedEvent = new CustomEvent('testtrusted');
+    is(untrustedEvent.type, 'testtrusted', "Constructor should see type");
+    bound.dispatchEvent(untrustedEvent);
+    ok(!window.triggeredTrustedHandler, "untrusted events should not trigger trusted handler");
+    var trustedEvent = new CustomEvent('testtrusted');
+    is(trustedEvent.type, 'testtrusted', "Wrapped constructor should see type");
+    SpecialPowers.wrap(bound).dispatchEvent(trustedEvent); // Dispatch over SpecialPowers to make the event trusted.
+    ok(window.triggeredTrustedHandler, "trusted events should trigger trusted handler");
+
+    //
+    // We check key events as well, since they're implemented differently.
+    //
+    // NB: We don't check isTrusted on the events we create here, because
+    // according to smaug, old-style event initialization doesn't mark the
+    // event as trusted until it's dispatched.
+    //
+
+    window.triggeredUntrustedKeyHandler = false;
+    window.triggeredTrustedKeyHandler = false;
+
+    // Untrusted event, permissive handler.
+    var untrustedKeyEvent = document.createEvent('KeyboardEvent');
+    untrustedKeyEvent.initEvent('keyup', true, true);
+    bound.dispatchEvent(untrustedKeyEvent);
+    ok(window.triggeredUntrustedKeyHandler, "untrusted key events should trigger untrusted handler");
+
+    // Untrusted event, strict handler.
+    var fakeTrustedKeyEvent = document.createEvent('KeyboardEvent');
+    fakeTrustedKeyEvent.initEvent('keydown', true, true);
+    bound.dispatchEvent(fakeTrustedKeyEvent);
+    ok(!window.triggeredTrustedKeyHandler, "untrusted key events should not trigger trusted handler");
+
+    // Trusted event, strict handler. Dispatch using SpecialPowers to make the event trusted.
+    var trustedKeyEvent = document.createEvent('KeyboardEvent');
+    trustedKeyEvent.initEvent('keydown', true, true);
+    SpecialPowers.wrap(bound).dispatchEvent(trustedKeyEvent);
+    ok(window.triggeredTrustedKeyHandler, "trusted key events should trigger trusted handler");
+
+    // Hand control back to the XBL scope by dispatching an event on the bound element.
+    bound.dispatchEvent(new CustomEvent('testevent'));
+  }
+
+  function checkThrows(fn) {
+    try { fn(); ok(false, "Should have thrown"); }
+    catch (e) { ok(!!/denied|insecure/.exec(e), "Should have thrown security exception: " + e); }
+  }
+
+  function checkAllowed(fn, desc) {
+    try { fn(); ok(true, desc + ": Didn't throw"); }
+    catch (e) { ok(false, desc + ": Threw: " + e); }
+  }
+
+  function setup() {
+    // When the bindings are applied, the constructor will be invoked and the
+    // test will continue.
+    document.getElementById('bound').style.MozBinding = 'url(#testBinding)';
+    document.getElementById('bound2').style.MozBinding = 'url(#testBinding)';
+    document.getElementById('bound3').style.MozBinding = 'url(#testBinding)';
+  }
+
+  ]]>
+</script>
+</head>
+<body onload="setup()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=821850">Mozilla Bug 821850</a>
+<p id="display"></p>
+<div id="content">
+  <div id="bound">Bound element</div>
+  <div id="bound2">Bound element</div>
+  <span id="bound3">Bound element</span>
+  <img/>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/file_bug844783.xhtml b/dom/xbl/test/file_bug844783.xhtml
new file mode 100644
index 0000000000..a2e04edf28
--- /dev/null
+++ b/dom/xbl/test/file_bug844783.xhtml
@@ -0,0 +1,54 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=844783
+-->
+<head>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="testBinding">
+      <implementation>
+        <constructor>
+          is(windowExpando, 42, "Expandos show up without explicit waiving");
+          someFunction();
+          ok(called, "Function called");
+          go();
+        </constructor>
+      </implementation>
+      <handlers>
+        <handler event="testevent" action="is(boundExpando, 11, 'See expandos on |this|'); SimpleTest.finish();"/>
+      </handlers>
+    </binding>
+  </bindings>
+  <script type="application/javascript">
+  <![CDATA[
+
+  is = parent.is;
+  ok = parent.ok;
+  SimpleTest = parent.SimpleTest;
+  window.windowExpando = 42;
+  window.someFunction = function() { ok(true, "Called"); window.called = true; };
+
+  function go() {
+    var bound = document.getElementById('bound');
+    bound.boundExpando = 11;
+    bound.dispatchEvent(new CustomEvent('testevent'));
+  }
+
+  function setup() {
+    // When the bindings are applied, the constructor will be invoked and the
+    // test will continue.
+    document.getElementById('bound').style.MozBinding = 'url(#testBinding)';
+  }
+
+  ]]>
+</script>
+</head>
+<body onload="setup()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=844783">Mozilla Bug 844783</a>
+<p id="display"></p>
+<div id="content">
+  <div id="bound">Bound element</div>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/file_bug944407.html b/dom/xbl/test/file_bug944407.html
new file mode 100644
index 0000000000..3e4a0e80f6
--- /dev/null
+++ b/dom/xbl/test/file_bug944407.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html>
+<body>
+<div id="deny" style="-moz-binding: url(file_bug944407.xml#testAllowScript)"></div>
+<div id="allow" style="-moz-binding: url(chrome://mochitests/content/chrome/dom/xbl/test/file_bug944407.xml#testAllowScript)"</div>
+<script>/* Flush layout with a script tab - see bug 944407 comment 37. */</script>
+</body>
+</html>
diff --git a/dom/xbl/test/file_bug944407.xml b/dom/xbl/test/file_bug944407.xml
new file mode 100644
index 0000000000..e48271b9f3
--- /dev/null
+++ b/dom/xbl/test/file_bug944407.xml
@@ -0,0 +1,76 @@
+<?xml version="1.0"?>
+<bindings id="testBindings" xmlns="http://www.mozilla.org/xbl"
+          xmlns:html="http://www.w3.org/1999/xhtml">
+  <binding id="testAllowScript" bindToUntrustedContent="true">
+    <implementation>
+       <property name="someProp" onget="return 2;" readonly="true"></property>
+       <method name="someMethod"><body> return 3; </body></method>
+       <method name="startTest">
+         <body>
+         <![CDATA[
+           // Make sure we only get constructed when we're loaded from a domain
+           // with script enabled.
+           is(this.id, 'allow', "XBL should only be bound when the origin of the binding allows scripts");
+
+           var t = this;
+           doFinish = function() {
+             // Take a moment to make sure that other constructors don't run when they shouldn't.
+             if (t.id == 'allow')
+               setTimeout(SpecialPowers.wrap(window.parent).finish, 100);
+           }
+
+           onTestEvent = function(target) {
+             ok(true, 'called event handler');
+
+             // Try calling event handlers on anonymous content.
+             var e = new MouseEvent('click');
+             document.getAnonymousNodes(target)[1].dispatchEvent(e);
+             ok(window.calledEventHandlerOnAC, "Should invoke event handler on AC");
+
+             // Now, dispatch a key event to test key handlers and move the test along.
+             var k = document.createEvent('KeyboardEvent');
+             k.initEvent('keyup', true, true);
+             target.dispatchEvent(k);
+           }
+
+           // Check the implementation.
+           is(this.someProp, 2, "Properties work");
+           is(this.someMethod(), 3, "Methods work");
+
+           // Kick over to the event handlers. This tests XBL event handlers,
+           // XBL key handlers, and event handlers on anonymous content.
+           this.dispatchEvent(new CustomEvent('testEvent'));
+         ]]>
+         </body>
+       </method>
+
+      <constructor>
+      <![CDATA[
+        win = XPCNativeWrapper.unwrap(window);
+        SpecialPowers = win.SpecialPowers;
+        ok = win.ok = SpecialPowers.wrap(window.parent).ok;
+        is = win.is = SpecialPowers.wrap(window.parent).is;
+        info = win.info = SpecialPowers.wrap(window.parent).info;
+
+        info("Invoked constructor for " + this.id);
+
+        var t = this;
+        window.addEventListener('load', function loadListener() {
+          window.removeEventListener('load', loadListener);
+          // Wait two refresh-driver ticks to make sure that the constructor runs
+          // for both |allow| and |deny| if it's ever going to.
+          //
+          // See bug 944407 comment 37.
+          info("Invoked load listener for " + t.id);
+          window.requestAnimationFrame(function() { window.requestAnimationFrame(t.startTest.bind(t)); });
+        });
+      ]]>
+      </constructor>
+    </implementation>
+    <handlers>
+      <handler event="testEvent" action="onTestEvent(this)" allowuntrusted="true"/>
+      <handler event="keyup" action="ok(true, 'called key handler'); doFinish();" allowuntrusted="true"/>
+    </handlers>
+    <content>Anonymous Content<html:div onclick="window.calledEventHandlerOnAC = true;"></html:div><html:b style="display:none"><children/></html:b></content>
+  </binding>
+</bindings>
diff --git a/dom/xbl/test/file_bug946815.xhtml b/dom/xbl/test/file_bug946815.xhtml
new file mode 100644
index 0000000000..ca8718b7ba
--- /dev/null
+++ b/dom/xbl/test/file_bug946815.xhtml
@@ -0,0 +1,97 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=946815
+-->
+<head>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="testBinding">
+      <implementation>
+        <constructor>
+          // Grab some basic infrastructure off the content window.
+          var win = XPCNativeWrapper.unwrap(window);
+          SpecialPowers = win.SpecialPowers;
+          Cu = SpecialPowers.Cu;
+          is = win.is;
+          ok = win.ok;
+          SimpleTest = win.SimpleTest;
+
+          var bound = document.getElementById('bound');
+
+          // This gets invoked by an event handler.
+          window.finish = function() {
+            // XBL scope, with 'wifi-manage' scope
+            testWifiPermissionFromXbl(true, true /* with wifi-manage permission */);
+            SimpleTest.finish();
+          }
+
+          eval('var testWifiPermissionFromXbl = ' + win.testWifiPermissionFromContent.toSource());
+
+          // XBL scope, with no 'wifi-manage' permission
+          testWifiPermissionFromXbl(true, false /* without wifi-manage permission */);
+
+          // Hand things off to content. Content will call us back.
+          win.go();
+        </constructor>
+      </implementation>
+      <handlers>
+        <handler event="testevent" action="ok(true, 'called event handler'); finish();" allowuntrusted="true"/>
+      </handlers>
+    </binding>
+  </bindings>
+  <script type="application/javascript">
+  <![CDATA[
+
+  ok = parent.ok;
+  is = parent.is;
+  SimpleTest = parent.SimpleTest;
+  SpecialPowers = parent.SpecialPowers;
+
+  function go() {
+    "use strict";
+
+    // Content scope, with no 'wifi-manage' permission
+    testWifiPermissionFromContent(false, false /* without wifi-manage permission */);
+
+    SpecialPowers.pushPermissions([{ "type": "wifi-manage", "allow": 1, "context": window.document }], function() {
+      testWifiPermissionFromContent(false, true /* with wifi-manage permission */);
+      // Hand control back to the XBL scope by dispatching an event on the bound element.
+      bound.dispatchEvent(new CustomEvent('testevent'));
+    });
+  }
+
+  function testWifiPermissionFromContent(aIsXblScope, aExpectedWifiPermission) {
+    // Even though the function name has suggested we are either in content or
+    // XBL scope, the argument |aIsXblScope| is still required to print
+    // descriptive enough message for the test.
+
+    // If this test fails, something must be wrong with the permission manipulation.
+    // Check test_bug946815.html to see if we removed wifi-manage permission in
+    // the beginning and if we forgot to add permission back during testing.
+    is(aExpectedWifiPermission, SpecialPowers.hasPermission("wifi-manage", window.document),
+       "'wifi-manage' permission is not as expected! Expected: " + aExpectedWifiPermission);
+
+    is(typeof window.MozWifiP2pManager, (aExpectedWifiPermission ? "function" : "undefined"),
+       (aIsXblScope ? "XBL" : "Content") + " should" + (aExpectedWifiPermission ? "" : " NOT") +
+       " see MozWifiP2pManager with" + (aExpectedWifiPermission ? "" : "out") +
+       " 'wifi-manage' permission." );
+  }
+
+  function setup() {
+    // When the bindings are applied, the constructor will be invoked and the
+    // test will continue.
+    document.getElementById('bound').style.MozBinding = 'url(#testBinding)';
+  }
+
+  ]]>
+</script>
+</head>
+<body onload="setup()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=946815">Mozilla Bug 946815</a>
+<p id="display"></p>
+<div id="content">
+  <div id="bound">Bound element</div>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/file_bug950909.html b/dom/xbl/test/file_bug950909.html
new file mode 100644
index 0000000000..a33d9bbf8d
--- /dev/null
+++ b/dom/xbl/test/file_bug950909.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html>
+<head>
+</head>
+<body>
+<div style="-moz-binding: url(chrome://mochitests/content/chrome/dom/xbl/test/file_bug950909.xml#testBinding"></div>
+</body>
+</html>
diff --git a/dom/xbl/test/file_bug950909.xml b/dom/xbl/test/file_bug950909.xml
new file mode 100644
index 0000000000..c711d9ed42
--- /dev/null
+++ b/dom/xbl/test/file_bug950909.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0"?>
+<bindings id="chromeTestBindings" xmlns="http://www.mozilla.org/xbl">
+  <binding id="testBinding" bindToUntrustedContent="true">
+    <implementation implements="nsIObserver">
+      <constructor>
+      <![CDATA[
+        // This binding gets applied to a content object, and thus is actually
+        // running in a content XBL scope.
+        var win = XPCNativeWrapper.unwrap(window);
+        var SpecialPowers = win.SpecialPowers;
+        var ok = SpecialPowers.unwrap(SpecialPowers.wrap(window).parent.ok);
+        ok(win != window, "Should be running in an XBL scope with Xrays");
+
+        // Generate an XPCWrappedJS for the reflector. We need to do this
+        // explicitly with a testing helper, because we're converging on
+        // removing XPConnect from the web, which means that it won't be
+        // possible to generate an XPCWrappedJS from content (or XBL) code.
+        var scope = {};
+        var holder = SpecialPowers.Cu.generateXPCWrappedJS(this, scope);
+
+        // Now, QI |this|, which will generate an aggregated native.
+        this.QueryInterface(Components.interfaces.nsIObserver);
+
+        ok(true, "Didn't assert or crash");
+
+        SpecialPowers.wrap(window).parent.SimpleTest.finish();
+      ]]>
+      </constructor>
+      <method name="observe">
+        <parameter name="aSubject"/>
+        <parameter name="aTopic"/>
+        <parameter name="aData"/>
+        <body><![CDATA[]]></body>
+      </method>
+    </implementation>
+  </binding>
+</bindings>
diff --git a/dom/xbl/test/file_fieldScopeChain.xml b/dom/xbl/test/file_fieldScopeChain.xml
new file mode 100644
index 0000000000..80e6cf4776
--- /dev/null
+++ b/dom/xbl/test/file_fieldScopeChain.xml
@@ -0,0 +1,8 @@
+<bindings xmlns="http://www.mozilla.org/xbl"
+          xmlns:html="http://www.w3.org/1999/xhtml">
+  <binding id="foo">
+    <implementation>
+      <field name="bar">baz</field>
+    </implementation>
+  </binding>
+</bindings>
diff --git a/dom/xbl/test/mochitest.ini b/dom/xbl/test/mochitest.ini
new file mode 100644
index 0000000000..2804d501f7
--- /dev/null
+++ b/dom/xbl/test/mochitest.ini
@@ -0,0 +1,43 @@
+[DEFAULT]
+support-files =
+  bug310107-resource.xhtml
+  file_bug372769.xhtml
+  file_bug379959_cross.html
+  file_bug379959_data.html
+  file_bug379959_xbl.xml
+  file_bug397934.xhtml
+  file_bug481558.xbl
+  file_bug481558css.sjs
+  file_bug591198_inner.html
+  file_bug591198_xbl.xml
+  file_bug821850.xhtml
+  file_bug844783.xhtml
+  file_bug944407.html
+  file_bug944407.xml
+  file_bug946815.xhtml
+  file_bug950909.html
+
+[test_bug310107.html]
+[test_bug366770.html]
+[test_bug371724.xhtml]
+[test_bug372769.html]
+[test_bug378866.xhtml]
+[test_bug379959.html]
+[test_bug389322.xhtml]
+[test_bug397934.html]
+[test_bug400705.xhtml]
+[test_bug401907.xhtml]
+[test_bug403162.xhtml]
+[test_bug468210.xhtml]
+[test_bug481558.html]
+[test_bug526178.xhtml]
+[test_bug542406.xhtml]
+[test_bug591198.html]
+[test_bug639338.xhtml]
+[test_bug790265.xhtml]
+[test_bug821850.html]
+[test_bug844783.html]
+[test_bug872273.xhtml]
+[test_bug1086996.xhtml]
+[test_bug1098628_throw_from_construct.xhtml]
+[test_bug1359859.xhtml]
\ No newline at end of file
diff --git a/dom/xbl/test/test_bug1086996.xhtml b/dom/xbl/test/test_bug1086996.xhtml
new file mode 100644
index 0000000000..c60855a005
--- /dev/null
+++ b/dom/xbl/test/test_bug1086996.xhtml
@@ -0,0 +1,62 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1086996
+-->
+<head>
+  <bindings xmlns="http://www.mozilla.org/xbl"
+            xmlns:html="http://www.w3.org/1999/xhtml">
+    <binding id="handlerBinding">
+      <implementation>
+        <constructor>
+          <![CDATA[XPCNativeWrapper.unwrap(window).constructedHandlerBinding();]]>
+        </constructor>
+      </implementation>
+      <handlers>
+        <handler event="testevent" action="XPCNativeWrapper.unwrap(window).gotEvent();" allowuntrusted="true"/>
+      </handlers>
+    </binding>
+    <binding id="mainBinding">
+      <content>
+        <html:p id="acWithBinding" style="-moz-binding: url(#handlerBinding)"> Anonymous Content</html:p>
+      </content>
+      <implementation>
+        <method name="doEventDispatch" exposeToUntrustedContent="true">
+          <body>
+            <![CDATA[document.getAnonymousNodes(this)[0].dispatchEvent(new CustomEvent('testevent'));]]>
+          </body>
+        </method>
+      </implementation>
+    </binding>
+  </bindings>
+  <title>Test for Bug 1086996</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1086996">Mozilla Bug 1086996</a>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 1086996 **/
+SimpleTest.waitForExplicitFinish();
+function constructedHandlerBinding() {
+  ok(true, "Constructed handler binding!");
+  setTimeout(function() { $('boundContent').doEventDispatch(); }, 0);
+}
+
+function gotEvent() {
+  ok(true, "Successfully triggered event handler");
+  SimpleTest.finish();
+}
+
+]]>
+</script>
+</pre>
+<!-- This div needs to come after the <script> so we don't run the binding ctor
+     before the <script> has been parsed -->
+<div id="boundContent" style="-moz-binding: url(#mainBinding)"></div>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug1098628_throw_from_construct.xhtml b/dom/xbl/test/test_bug1098628_throw_from_construct.xhtml
new file mode 100644
index 0000000000..22bc88798d
--- /dev/null
+++ b/dom/xbl/test/test_bug1098628_throw_from_construct.xhtml
@@ -0,0 +1,40 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1098628
+-->
+<head>
+  <title>Test for Bug 1098628</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script class="testbody" type="text/javascript">
+  <![CDATA[
+
+  /** Test for Bug 1098628 **/
+  SimpleTest.waitForExplicitFinish();
+  SimpleTest.monitorConsole(SimpleTest.finish, [{errorMessage: new RegExp('flimfniffle')}]);
+  addLoadEvent(function() {
+    SimpleTest.executeSoon(SimpleTest.endMonitorConsole);
+  });
+  ]]>
+  </script>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test">
+      <implementation>
+        <constructor><![CDATA[
+          throw "flimfniffle";
+        ]]></constructor>
+      </implementation>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1098628">Mozilla Bug 1098628</a>
+<p id="display" style="-moz-binding: url(#test)"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug1359859.xhtml b/dom/xbl/test/test_bug1359859.xhtml
new file mode 100644
index 0000000000..564c2f96d8
--- /dev/null
+++ b/dom/xbl/test/test_bug1359859.xhtml
@@ -0,0 +1,41 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <!--
+  https://bugzilla.mozilla.org/show_bug.cgi?id=1359859
+  -->
+  <head>
+    <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+    <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+    <bindings xmlns="http://www.mozilla.org/xbl">
+      <binding id="testBinding">
+        <implementation>
+          <constructor>
+            XPCNativeWrapper.unwrap(window).running();
+            this.constructed = true;
+            throw new Error("Constructor threw");
+          </constructor>
+          <field name="throwingField">throw new Error("field threw")</field>
+          <field name="normalField">"hello"</field>
+        </implementation>
+      </binding>
+    </bindings>
+    <script>
+      // We need to wait for the binding to load.
+      SimpleTest.waitForExplicitFinish();
+      function running() {
+        // Wait for the rest of the constructor to run
+        SimpleTest.executeSoon(function() {
+          is(document.getElementById("bound").throwingField, undefined,
+             "Should not have a value for a throwing field");
+          is(document.getElementById("bound").normalField, "hello",
+             "Binding should be installed");
+          // The real test is that we haven't gotten any error events so far.
+          SimpleTest.finish();
+        });
+      }
+    </script>
+  </head>
+  <body>
+    <div id="bound" style="-moz-binding: url(#testBinding)"/>
+  </body>
+</html>
+    
diff --git a/dom/xbl/test/test_bug310107.html b/dom/xbl/test/test_bug310107.html
new file mode 100644
index 0000000000..17e642b974
--- /dev/null
+++ b/dom/xbl/test/test_bug310107.html
@@ -0,0 +1,53 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=310107
+-->
+<head>
+  <title>Test for Bug 310107</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=310107">Mozilla Bug 310107</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+/** Test for Bug 310107 **/
+SimpleTest.waitForExplicitFinish();
+
+var win = window.open("bug310107-resource.xhtml", "", "width=10, height=10");
+
+function runTest() {
+  window.el = win.document.getElementById("bar");
+  window.doc = win.document;
+  is(window.el.prop, 2, "Unexpected prop value at load");
+
+  win.location = "data:text/html,<body onload='window.opener.loadDone()'>";
+}
+
+function loadDone() {
+  is(window.el.prop, 2, "Prop still 2 because we're in bfcache");
+  is(window.el, window.doc.getElementById("bar"),
+     "document didn't get bfcached?");
+
+  // Remove our node from the DOM
+  window.el.parentNode.removeChild(window.el);
+
+  is(window.el.prop, undefined, "Binding should have been detached");
+  is(typeof(window.el.prop), "undefined", "Really undefined");
+
+  win.close();
+
+  SimpleTest.finish();
+}
+
+
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug366770.html b/dom/xbl/test/test_bug366770.html
new file mode 100644
index 0000000000..d3314ecca4
--- /dev/null
+++ b/dom/xbl/test/test_bug366770.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=366770
+-->
+<head>
+  <title>Test for Bug 366770</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=366770">Mozilla Bug 366770</a>
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+
+  <!-- data: URI below corresponds to:
+  <?xml version="1.0"?>
+  <bindings id="xbltestBindings" xmlns="http://www.mozilla.org/xbl">
+    <binding id="xbltest">
+      <content>PASS</content>
+      <implementation>
+        <constructor>
+          var win = XPCNativeWrapper.unwrap(window);
+          win.document.bindingConstructorRan = true;
+          win.ok(true, "binding URI with no fragment applied");
+          win.SimpleTest.finish();
+        </constructor>
+      </implementation>
+    </binding>
+  </bindings>
+  -->
+  <span id="span" style="-moz-binding: url(data:text/xml;base64,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);"></span>
+
+  <pre id="test">
+    <script class="testbody" type="text/javascript">
+      /** Test for Bug 366770 **/
+      SimpleTest.waitForExplicitFinish();
+    </script>
+  </pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug371724.xhtml b/dom/xbl/test/test_bug371724.xhtml
new file mode 100644
index 0000000000..69a317fde4
--- /dev/null
+++ b/dom/xbl/test/test_bug371724.xhtml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=371724
+-->
+<head>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>        
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="rd">
+      <implementation>
+        <property name="hallo" onget="return true;" readonly="true" exposeToUntrustedContent="true"/>
+      </implementation>
+    </binding>
+  </bindings>
+</head>
+<body>
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=371724">Mozilla Bug 371724</a>
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <div id="a" style="-moz-binding:url('#rd');">Success!</div>
+  <pre id="test">
+    <script class="testbody" type="text/javascript">  
+      /** Test for Bug 371724 **/
+      SimpleTest.waitForExplicitFinish();
+      function checkReadOnly() {
+        var elt = document.getElementById('a');
+        var oldValue = elt.hallo;
+        var actual;
+        try {
+          elt.hallo = false;
+          actual = elt.hallo;
+        } catch (ex) {
+          actual = "" + ex;
+        }
+        is(actual, true,
+           "Setting a readonly xbl property should do nothing if !strict");
+        checkReadOnlyStrict();
+      }
+      function checkReadOnlyStrict() {
+        "use strict";
+        var elt = document.getElementById('a');
+        var actual;
+        try {
+          elt.hallo = false;
+          actual = "should have thrown";
+        } catch (ex) {
+          actual = ex instanceof TypeError;
+        }
+        is(actual, true,
+           "Setting a readonly xbl property should throw a TypeError exception if strict");
+        SimpleTest.finish();
+      }
+      addLoadEvent(checkReadOnly);
+    </script>
+  </pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug372769.html b/dom/xbl/test/test_bug372769.html
new file mode 100644
index 0000000000..c5cbbb7dea
--- /dev/null
+++ b/dom/xbl/test/test_bug372769.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=372769
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 372769</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  SimpleTest.waitForExplicitFinish();
+
+  // Embed the real test. It will take care of everything else.
+  function setup() {
+    SpecialPowers.pushPrefEnv({'set': [['dom.use_xbl_scopes_for_remote_xul', false]]}, go);
+  }
+  function go() {
+    $('ifr').setAttribute('src', 'file_bug372769.xhtml');
+  }
+
+  </script>
+</head>
+<body onload="setup();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=372769">Mozilla Bug 372769</a>
+<p id="display"></p>
+<div id="content">
+<iframe id="ifr"></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug378518.xul b/dom/xbl/test/test_bug378518.xul
new file mode 100644
index 0000000000..0486f34806
--- /dev/null
+++ b/dom/xbl/test/test_bug378518.xul
@@ -0,0 +1,83 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=378518
+-->
+<window title="Mozilla Bug 378518"
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+    
+  <script type="application/javascript"
+    src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <bindings xmlns="http://www.mozilla.org/xbl"
+    xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+      <binding id="mybinding" extends="xul:checkbox">
+          <content>
+          </content>
+      </binding>
+
+  </bindings>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+      <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=378518"
+         target="_blank">Mozilla Bug 378518</a>
+  </body>
+
+   <!-- The elements we're testing with -->
+  <command id="myBoxCommand" oncommand="myBoxClicked = true;"/>
+  <command id="myCheckBoxCommand" oncommand="myCheckBoxClicked = true;"/>
+  <command id="myExtendedBoxCommand" oncommand="myExtendedBoxClicked = true;"/>
+
+  <box id="myBox" command="myBoxCommand">
+    <label>myBox</label>
+  </box>
+
+  <checkbox id="myCheckBox" command="myCheckBoxCommand" label="myCheckBox"/>
+
+  <box id="myExtendedBox" command="myExtendedBoxCommand"
+    style="-moz-binding:url(#mybinding)">
+    <label>myExtendedBox</label>
+  </box>
+
+  <!-- test code goes here -->
+  <script type="application/javascript"> <![CDATA[
+
+    SimpleTest.expectAssertions(1);
+
+    var myBoxClicked = false;
+    var myCheckBoxClicked = false;
+    var myExtendedBoxClicked = false;
+
+    function testClick(elemName) {
+      var wu  =
+        window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+              .getInterface(Components.interfaces.nsIDOMWindowUtils);
+
+      var a = document.getElementById(elemName).getBoundingClientRect();
+      wu.sendMouseEvent('mousedown',  a.left + 1, a.top + 1, 0, 1, 0);
+      wu.sendMouseEvent('mouseup',  a.left + 1, a.top + 1, 0, 1, 0);
+    }
+
+    function doTest() {
+      testClick('myBox');
+      testClick('myCheckBox');
+      testClick('myExtendedBox');
+      ok(!myBoxClicked, "Shouldn't fire");
+      ok(myCheckBoxClicked, "Should fire");
+      ok(!myExtendedBoxClicked, "Shouldn't fire");
+      SimpleTest.finish();
+    }
+
+    /** Test for Bug 378518 **/
+    SimpleTest.waitForExplicitFinish();
+
+    addLoadEvent(function() {
+      setTimeout(doTest, 0);
+    });
+
+    ]]>
+    </script>
+</window>
diff --git a/dom/xbl/test/test_bug378866.xhtml b/dom/xbl/test/test_bug378866.xhtml
new file mode 100644
index 0000000000..5a5b9a09a7
--- /dev/null
+++ b/dom/xbl/test/test_bug378866.xhtml
@@ -0,0 +1,57 @@
+<?xml version="1.0"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=378866
+-->
+<head>
+  <title>Test for Bug 378866</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl" xmlns:html="http://www.w3.org/1999/xhtml">
+    <binding id="b1">
+      <content><html:span><html:span>
+        <children/>
+      </html:span></html:span></content>
+  </binding>
+</bindings>
+
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=378866">Mozilla Bug 378866</a>
+<p id="display"></p>
+<div id="content">
+  <span id="grandparent" style="-moz-binding: url(#b1);">
+    <span id="parent">
+      <span id="child"/>
+    </span>
+  </span>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+/** Test for Bug 378866 **/
+
+function runTest() {
+  var anon = SpecialPowers.wrap(document).getAnonymousNodes(document.getElementById('grandparent'));
+  var child = SpecialPowers.wrap(document).getElementById('child');
+  var insertionPoint = anon[0].childNodes[0];
+  insertionPoint.parentNode.removeChild(insertionPoint);
+  child.appendChild(insertionPoint);
+
+  var e = document.createEvent("Event");
+  e.initEvent("foo", true, true);
+  child.dispatchEvent(e);
+  ok(true, "Moving insertion point shouldn't cause problems in event dispatching");
+  addLoadEvent(SimpleTest.finish);
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug379959.html b/dom/xbl/test/test_bug379959.html
new file mode 100644
index 0000000000..2b31b54c57
--- /dev/null
+++ b/dom/xbl/test/test_bug379959.html
@@ -0,0 +1,69 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=379959
+-->
+<head>
+  <title>Test for Bug 379959</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body onload="runTest();">
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=379959">Mozilla Bug 379959</a>
+  <p id="display">
+    Note: In order to re-run this test correctly you need to shift-reload
+    rather than simply reload. If you just reload we will restore the
+    previous url in the iframe which will result in an extra unexpected
+    message.
+  </p>
+  <div id="content" style="display: none"></div>
+  <iframe id="dataFrame"></iframe>
+  <iframe id="originFrame"></iframe>
+
+  <pre id="test">
+    <script class="testbody" type="application/javascript;version=1.7">
+
+SimpleTest.waitForExplicitFinish();
+
+var seenData = false;
+var seenSameOrigin = false;
+var seenCrossOrign = false;
+
+function receiveMessage(e) {
+  is(e.origin, "http://mochi.test:8888", "wrong sender!");
+
+  if (e.data.test === "dataIsAllowed") {
+    is(e.data.result, 1, "data-url load should have succeeded");
+    seenData = true;
+  }
+  else if (e.data.test === "sameOriginIsAllowed") {
+    is(e.data.result, 1, "same site load should have succeeded");
+    seenSameOrigin = true;
+  }
+  else if (e.data.test === "crossOriginIsBlocked") {
+    is(e.data.result, 0, "cross site load should have failed");
+    seenCrossOrign = true;
+  }
+  else {
+    ok (false, "unrecognized test");
+  }
+
+  if (seenData && seenSameOrigin && seenCrossOrign) {
+    window.removeEventListener("message", receiveMessage, false);
+    SimpleTest.finish();
+  }
+}
+
+window.addEventListener("message", receiveMessage, false);
+
+function runTest() {
+  // make sure data: is allowed
+  document.getElementById('dataFrame').src = "file_bug379959_data.html";
+  // make sure same-origin is allowed but cross site is blocked
+  document.getElementById('originFrame').src = "file_bug379959_cross.html";
+}
+
+    </script>
+  </pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug389322.xhtml b/dom/xbl/test/test_bug389322.xhtml
new file mode 100644
index 0000000000..4b80346bd2
--- /dev/null
+++ b/dom/xbl/test/test_bug389322.xhtml
@@ -0,0 +1,126 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=389322
+-->
+<head>
+  <title>Test for Bug 389322</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script>var ctorRan = false;</script>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test">
+      <implementation>
+        <field name="field"><![CDATA[
+          (function () {
+             try {
+               eval("let x = 1;");
+               var success = true;
+             }
+             catch (e) { success = false; }
+             XPCNativeWrapper.unwrap(window).report("XBL fields", success)
+             return ""
+           }())
+        ]]></field>
+        <property name="property">
+          <getter><![CDATA[
+             try {
+               eval("let x = 1;");
+               var success = true;
+             }
+             catch (e) { success = false; }
+             XPCNativeWrapper.unwrap(window).report("XBL property getters", success)
+             return 1
+           ]]></getter>
+          <setter><![CDATA[
+            try {
+              eval("let x = 1;");
+              var success = true
+            }
+            catch (e) { success = false }
+            XPCNativeWrapper.unwrap(window).report("XBL property setters", success)
+            return val
+          ]]></setter>
+        </property>
+        <method name="method">
+          <body><![CDATA[
+            try {
+              eval("let x = 1;");
+              var success = true;
+
+            }
+            catch (e) { success = false; }
+            XPCNativeWrapper.unwrap(window).report("XBL methods", success)
+          ]]></body>
+        </method>
+        <constructor><![CDATA[
+          this.property += 1
+          var x = this.field;
+          this.method()
+          try {
+            eval("let x = 1;");
+            var success = true
+          }
+          catch (e) { success = false }
+          var win = XPCNativeWrapper.unwrap(window);
+          win.report("XBL constructors", success)
+        
+          var ev = document.createEvent("Events")
+          ev.initEvent("custom", false, false)
+          this.dispatchEvent(ev)
+          win.ctorRan = true;
+        ]]></constructor>
+      </implementation>
+      <handlers>
+        <handler action='
+          try {
+            eval("let x = 1;");
+            var success = true
+          }
+          catch (e) { success = false }
+          report("XBL event handlers", success);
+        ' event="custom"/>
+      </handlers>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=389322">Mozilla Bug 389322</a>
+<p id="display" style="-moz-binding: url(#test)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+/** Test for Bug 389322 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  is(ctorRan, true, "Constructor should have run");
+});
+addLoadEvent(SimpleTest.finish);
+
+function report(testName, success) {
+  is(success, true, "JS 1.7 should work in " + testName);
+}
+]]>
+</script>
+<script type="text/javascript; version=1.7"><![CDATA[
+  try {
+    eval("let x = 1;");
+    var success = true;
+  }
+  catch (e) { success = false; }
+  report("HTML script tags with explicit version", success)
+]]></script>
+<script type="text/javascript"><![CDATA[
+  try {
+    eval("let x = 1;");
+    var success = true;
+  }
+  catch (e) { success = false; }
+  is(success, true, "let should work in versionless HTML script tags");
+]]></script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug397934.html b/dom/xbl/test/test_bug397934.html
new file mode 100644
index 0000000000..098b4c7b54
--- /dev/null
+++ b/dom/xbl/test/test_bug397934.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=397934
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 397934</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  SimpleTest.waitForExplicitFinish();
+
+  // Embed the real test. It will take care of everything else.
+  function setup() {
+    SpecialPowers.pushPrefEnv({'set': [['dom.use_xbl_scopes_for_remote_xul', false]]}, go);
+  }
+  function go() {
+    $('ifr').setAttribute('src', 'file_bug397934.xhtml');
+  }
+
+  </script>
+</head>
+<body onload="setup();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=397934">Mozilla Bug 397934</a>
+<p id="display"></p>
+<div id="content">
+<iframe id="ifr"></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug398135.xul b/dom/xbl/test/test_bug398135.xul
new file mode 100644
index 0000000000..6b0b68c626
--- /dev/null
+++ b/dom/xbl/test/test_bug398135.xul
@@ -0,0 +1,135 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=398135
+-->
+<window title="Mozilla Bug 398135"
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript">window.log = ""</script>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="ancestor">
+      <implementation>
+        <constructor>
+          window.log += "ancestorConstructor:";
+        </constructor>
+        <destructor>
+          window.log += "ancestorDestructor:";
+        </destructor>
+        <field name="ancestorField">"ancestorField"</field>
+        <property name="ancestorProp" onget="return 'ancestorProp'"/>
+        <method name="ancestorMethod">
+          <body>
+            return "ancestorMethod";
+          </body>
+        </method>
+      </implementation>
+    </binding>
+    <binding id="test" extends="#ancestor">
+      <implementation>
+        <constructor>
+          window.log += "descendantConstructor:";
+        </constructor>
+        <destructor>
+          window.log += "descendantDestructor:";
+        </destructor>
+        <field name="descendantField">"descendantField"</field>
+        <field name="contentField">
+          document.getAnonymousNodes(this)[0];
+        </field>
+        <property name="descendantProp" onget="return 'descendantProp'"/>
+        <method name="descendantMethod">
+          <body>
+            return "descendantMethod";
+          </body>
+        </method>
+      </implementation>
+      <content>
+        <span/>
+        <children/>
+      </content>
+    </binding>
+  </bindings>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=398135"
+     target="_blank">Mozilla Bug 398135</a>
+  </body>
+
+  <hbox id="display" style="-moz-binding: url(#test)"></hbox>
+
+<script type="application/javascript">
+<![CDATA[
+/** Test for Bug 398135 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var d;
+  d = $("display");
+
+  function testInTree(type) {
+    is(d.ancestorField, "ancestorField", "Wrong ancestor field " + type);
+    is(d.descendantField, "descendantField", "Wrong descendant field " + type);
+    is(d.ancestorProp, "ancestorProp", "Wrong ancestor prop " + type);
+    is(d.descendantProp, "descendantProp", "Wrong descendant prop " + type);
+    is(d.ancestorMethod(), "ancestorMethod", "Wrong ancestor method " + type);
+    is(d.descendantMethod(), "descendantMethod",
+       "Wrong descendant method " + type);
+    is(d.contentField, document.getAnonymousNodes(d)[0],
+       "Unexpected content field " + type);
+  }
+
+  function testNotInTree(type) {
+    is(typeof(d.ancestorField), "undefined", "Wrong ancestor field " + type);
+    is(typeof(d.descendantField), "undefined",
+       "Wrong descendant field " + type);
+    is(typeof(d.ancestorProp), "undefined", "Wrong ancestor prop " + type);
+    is(typeof(d.descendantProp), "undefined", "Wrong descendant prop " + type);
+    is(typeof(d.ancestorMethod), "undefined", "Wrong ancestor method " + type);
+    is(typeof(d.descendantMethod), "undefined",
+       "Wrong descendant method " + type);
+    is(typeof(d.contentField), "undefined",
+       "Unexpected content field " + type);
+  }
+
+  is(window.log, "ancestorConstructor:descendantConstructor:",
+     "Constructors did not fire?");
+  window.log = "";
+  testInTree("before removal");
+
+  var parent = d.parentNode;
+  var nextSibling = d.nextSibling;
+  parent.removeChild(d);
+  testNotInTree("after first removal");
+
+  todo(window.log == "descendantDestructor:ancestorDestructor:",
+     "Destructors did not fire");
+  window.log = "";
+  
+  parent.insertBefore(d, nextSibling);
+  is(window.log, "ancestorConstructor:descendantConstructor:",
+     "Constructors did not fire a second time?");
+  window.log = "";
+  testInTree("after reinsertion");
+
+  // Now munge the proto chain to test the robustness of the proto-unhooking
+  // code
+  var origProto = d.__proto__;
+  var origProtoProto = origProto.__proto__;
+  var newProto = new Object();
+  origProto.__proto__ = newProto;
+  newProto.__proto__ = origProtoProto;
+
+  parent.removeChild(d);
+  todo(window.log == "descendantDestructor:ancestorDestructor:",
+     "Destructors did not fire a second time?");
+
+  testNotInTree("after second removal");
+});
+addLoadEvent(SimpleTest.finish);
+
+]]>
+</script>
+</window>
+
diff --git a/dom/xbl/test/test_bug398492.xul b/dom/xbl/test/test_bug398492.xul
new file mode 100644
index 0000000000..a854d50fc9
--- /dev/null
+++ b/dom/xbl/test/test_bug398492.xul
@@ -0,0 +1,91 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=398492
+-->
+<window title="Mozilla Bug 398492"
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test">
+      <content>
+        <xul:hbox id="xxx"
+            xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+          <children/>
+        </xul:hbox>
+      </content>
+    </binding>
+  </bindings>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=398492"
+     target="_blank">Mozilla Bug 398492</a>
+  </body>
+
+  <hbox id="testbox" style="-moz-binding: url(#test)">Text</hbox>
+  
+  <!-- test code goes here -->
+  <script type="application/javascript"><![CDATA[
+
+    /** Test for Bug 398492 **/
+    SimpleTest.waitForExplicitFinish();
+
+    function getXBLParent(node) {
+      var utils = Components.classes["@mozilla.org/inspector/dom-utils;1"]
+                            .getService(Components.interfaces.inIDOMUtils);
+      return utils.getParentForNode(node, true);
+    }
+
+    addLoadEvent(function() {
+      var n = $("testbox");
+      var kid = n.firstChild;
+      var anonKid = document.getAnonymousNodes(n)[0];
+      is(anonKid instanceof XULElement, true, "Must be a XUL element");
+      is(anonKid, getXBLParent(kid), "Unexpected anonymous nodes");
+
+      var n2 = n.cloneNode(true);
+      var kid2 = n2.firstChild;
+      var anonKid2 = document.getAnonymousNodes(n2)[0];
+      is(anonKid2 instanceof XULElement, true,
+         "Must be a XUL element after clone");
+      is(anonKid2, getXBLParent(kid2),
+         "Unexpected anonymous nodes after clone");
+
+      var n3 = document.createElement("hbox");
+      document.documentElement.appendChild(n3);
+      var kid3 = document.createTextNode("Text");
+      n3.appendChild(kid3);
+
+      // Note - we rely on the fact that the binding is preloaded
+      // by the other hbox here, so that the binding will be applied
+      // sync.
+      n3.style.MozBinding = "url(" + document.location.href + "#test)";
+      n3.getBoundingClientRect(); // Flush styles.
+
+      var anonKid3 = document.getAnonymousNodes(n3)[0];
+      is(anonKid3 instanceof XULElement, true,
+         "Must be a XUL element after addBinding");
+      is(anonKid3, getXBLParent(kid3),
+         "Unexpected anonymous nodes after addBinding");
+      
+
+      n.removeChild(kid);
+      isnot(anonKid, getXBLParent(kid),
+            "Should have removed kid from insertion point");
+
+      n2.removeChild(kid2);
+      isnot(anonKid2, getXBLParent(kid2),
+            "Should have removed kid2 from insertion point");
+    
+      n3.removeChild(kid3);
+      isnot(anonKid3, getXBLParent(kid3),
+            "Should have removed kid3 from insertion point");
+    
+      SimpleTest.finish();
+    });
+
+
+  ]]></script>
+</window>
diff --git a/dom/xbl/test/test_bug400705.xhtml b/dom/xbl/test/test_bug400705.xhtml
new file mode 100644
index 0000000000..6ed687d595
--- /dev/null
+++ b/dom/xbl/test/test_bug400705.xhtml
@@ -0,0 +1,48 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=400705
+-->
+<head>
+  <title>Test for Bug 400705</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test">
+      <implementation>
+        <field name="a">XPCNativeWrapper.unwrap(window).countera++</field>
+        <field name="b">XPCNativeWrapper.unwrap(window).counterb++</field>
+      </implementation>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=400705">Mozilla Bug 400705</a>
+<p id="display" style="-moz-binding: url(#test)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+/** Test for Bug 400705 **/
+SimpleTest.waitForExplicitFinish();
+
+addLoadEvent(function() {
+  window.countera = 0;
+  window.counterb = 0;
+
+  var d = $("display");
+  // Control to make sure fields are lazy and all
+  d.a;
+  is(window.countera, 1, "Should have evaluated field");
+
+  d.parentNode.removeChild(d);
+  is(window.counterb, 0, "Should not evaluate field on binding teardown");
+  SimpleTest.finish();
+});
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug401907.xhtml b/dom/xbl/test/test_bug401907.xhtml
new file mode 100644
index 0000000000..0bc368e29f
--- /dev/null
+++ b/dom/xbl/test/test_bug401907.xhtml
@@ -0,0 +1,58 @@
+<?xml version="1.0"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=401907
+-->
+<head>
+  <title>Test for Bug 401907</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="binding">
+      <implementation>
+        <constructor>
+          var win = XPCNativeWrapper.unwrap(window);
+          win.ok(true, "First binding with ID 'binding' should be used!");
+          win.testRun = true;
+          if (win.needsFinish) {
+            win.SimpleTest.finish();
+          }
+        </constructor>
+      </implementation>
+    </binding>
+    <binding id="binding">
+      <implementation>
+        <constructor>
+          var win = XPCNativeWrapper.unwrap(window);
+          win.ok(false, "First binding with ID 'binding' should be used!");
+          win.testRun = true;
+          if (win.needsFinish) {
+            win.SimpleTest.finish();
+          }
+        </constructor>
+      </implementation>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=401907">Mozilla Bug 401907</a>
+<p id="display"></p>
+<div id="content">
+  <div style="-moz-binding: url(#binding)">Bound element</div>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+/** Test for Bug 401907 **/
+if (!window.testRun) {
+  window.needsFinish = true;
+  SimpleTest.waitForExplicitFinish();
+}
+
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug403162.xhtml b/dom/xbl/test/test_bug403162.xhtml
new file mode 100644
index 0000000000..96c9d77ed9
--- /dev/null
+++ b/dom/xbl/test/test_bug403162.xhtml
@@ -0,0 +1,57 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=403162
+-->
+<head>
+  <title>Test for Bug 403162</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test">
+      <handlers>
+        <handler event="foo" action="XPCNativeWrapper.unwrap(window).triggerCount++" allowuntrusted="true"/>
+      </handlers>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=403162">Mozilla Bug 403162</a>
+<p id="display" style="-moz-binding: url(#test)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+var triggerCount = 0;
+
+function dispatchEvent(t) {
+  var ev = document.createEvent("Events");
+  ev.initEvent("foo", true, true);
+  t.dispatchEvent(ev);  
+}
+
+/** Test for Bug 403162 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var t = $("display");
+  is(triggerCount, 0, "Haven't dispatched event");
+
+  dispatchEvent(t);
+  is(triggerCount, 1, "Dispatched once");
+
+  dispatchEvent(t);
+  is(triggerCount, 2, "Dispatched twice");
+
+  t.parentNode.removeChild(t);
+  dispatchEvent(t);
+  is(triggerCount, 2, "Listener should be gone now");
+
+  SimpleTest.finish();
+});
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug468210.xhtml b/dom/xbl/test/test_bug468210.xhtml
new file mode 100644
index 0000000000..72834d241d
--- /dev/null
+++ b/dom/xbl/test/test_bug468210.xhtml
@@ -0,0 +1,51 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=468210
+-->
+<head>
+  <title>Test for Bug 468210</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <!-- Keep the stuff inside <content> without spaces, so that the getAnonymousNodes works right -->
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="foo">
+      <content><span xmlns='http://www.w3.org/1999/xhtml'><children xmlns="http://www.mozilla.org/xbl"/></span></content>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=468210">Mozilla Bug 468210</a>
+<p id="display">
+  <div id="d" style="-moz-binding: url(#foo);"></div>
+  <a name="foo"></a>
+</p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 468210 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var div = $("d");
+  var n = document.anchors.length;
+  is(n, 1, "Unexpected number of anchors");
+  var anon = SpecialPowers.wrap(document).getAnonymousNodes(div)[0];
+  ok(SpecialPowers.call_Instanceof(anon, HTMLSpanElement), "Unexpected node");
+  is(SpecialPowers.unwrap(anon.parentNode), div, "Unexpected parent");
+  document.body.appendChild(div);
+  is(anon.parentNode, null, "Parent should have become null");
+  // An attr set to test notifications
+  anon.setAttribute("h", "i");
+});
+addLoadEvent(SimpleTest.finish);
+
+
+
+]]>
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug481558.html b/dom/xbl/test/test_bug481558.html
new file mode 100644
index 0000000000..72b418987f
--- /dev/null
+++ b/dom/xbl/test/test_bug481558.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=481558
+-->
+<head>
+  <title>Test for Bug 481558</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+  <link rel="stylesheet" type="text/css"
+        href="file_bug481558css.sjs?id=id1">
+  <link rel="stylesheet" type="text/css"
+        href="file_bug481558css.sjs?id=id2&server=example.com">
+  <link rel="stylesheet" type="text/css" href="http://example.com/tests/dom/xbl/test/file_bug481558css.sjs?id=id3">
+  <link rel="stylesheet" type="text/css" href="http://example.com/tests/dom/xbl/test/file_bug481558css.sjs?id=id4&server=localhost:8888">
+</head>
+<body onload="runTest();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=481558">Mozilla Bug 481558</a>
+<p id="id1"></p>
+<p id="id2"></p>
+<p id="id3"></p>
+<p id="id4"></p>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+function runTest() {
+  is ($('id1').xblBoundProperty, 1, "XBL should be attached");
+  is ($('id2').xblBoundProperty, undefined, "XBL shouldn't be attached");
+  is ($('id3').xblBoundProperty, undefined, "XBL shouldn't be attached");
+  is ($('id4').xblBoundProperty, undefined, "XBL shouldn't be attached");
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug526178.xhtml b/dom/xbl/test/test_bug526178.xhtml
new file mode 100644
index 0000000000..602a405a1f
--- /dev/null
+++ b/dom/xbl/test/test_bug526178.xhtml
@@ -0,0 +1,80 @@
+<html xmlns="http://www.w3.org/1999/xhtml" style="display: none">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=526178
+-->
+<head>
+  <title>Test for Bug 526178</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style id="sheet">
+    #content * {
+      display: block;
+      -moz-binding: url("#binding");
+    }
+  </style>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="binding">
+      <implementation>
+        <constructor>
+          var win = XPCNativeWrapper.unwrap(window);
+          win.logString += this.localName;
+          win.bindingDone();
+        </constructor>
+      </implementation>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=526178">Mozilla Bug 526178</a>
+<div id="content">
+  <a>
+    <b>
+      <c/>
+    </b>
+    <d/>
+    <e style="display: inline">
+      <f style="display: inline">
+        <g style="display: inline"/>
+        <h style="display: none"/>
+        <i style="display: inline"/>
+      </f>
+      <j style="display: none"/>
+      <k style="display: inline">
+        <l style="display: inline"/>
+        <m/>
+        <n style="display: inline"/>
+      </k>
+    </e>
+    <o style="display: none"/>
+    <p/>
+  </a>
+</div>
+<p id="display">
+</p>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 526178 **/
+var logString = "";
+// Add one for the root
+var pendingBindings = $("content").getElementsByTagName("*").length + 1;
+function bindingDone() {
+  if (--pendingBindings == 0) {
+    is(logString, "apoeknmljfihgdbchtml");
+    SimpleTest.finish();
+  }
+}
+
+SimpleTest.waitForExplicitFinish();
+
+// Have to add the rule for the root dynamically so the binding doesn't try
+//  to load before bindingDone() is defined.
+$("sheet").sheet.insertRule(':root { -moz-binding: url("#binding"); }', 0);
+document.documentElement.style.display = "";
+
+]]>
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug542406.xhtml b/dom/xbl/test/test_bug542406.xhtml
new file mode 100644
index 0000000000..880d69a8e2
--- /dev/null
+++ b/dom/xbl/test/test_bug542406.xhtml
@@ -0,0 +1,44 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=542406
+-->
+<head>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="foo">
+      <content><children/></content>
+      <implementation>
+        <field name="one" readonly="true">1</field>
+        <field name="three">3</field>
+      </implementation>
+    </binding>
+  </bindings>
+  <title>Test for Bug 542406</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=542406">Mozilla Bug 542406</a>
+<p id="display" style="-moz-binding: url(#foo)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 542406 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  is($("display").one, 1, "Field one not installed?");
+  $("display").one = 2;
+  is($("display").one, 1, "Field one not readonly");
+  is($("display").three, 3, "Field three not installed?");
+  $("display").three = 4;
+  is($("display").three, 4, "Field three readonly?");
+  SimpleTest.finish();
+});
+]]>
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug591198.html b/dom/xbl/test/test_bug591198.html
new file mode 100644
index 0000000000..2c7df3613d
--- /dev/null
+++ b/dom/xbl/test/test_bug591198.html
@@ -0,0 +1,46 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=591198
+-->
+<head>
+  <title>Test for Bug 591198</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+</head>
+<body onload="gen.next();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=591198">Mozilla Bug 591198</a>
+<iframe id=iframe></iframe>
+<pre id="test">
+<script class="testbody" type="text/javascript;version=1.8">
+
+SimpleTest.waitForExplicitFinish();
+
+gen = runTest();
+
+function runTest() {
+  let iframe = $('iframe');
+  window.addEventListener("message", function(e) {
+    gen.send(JSON.parse(e.data));
+  }, false);
+  
+  iframe.src = "file_bug591198_inner.html";
+  let res = (yield);
+  is(res.widths[0], res.widths[2], "binding was rendered");
+  isnot(res.widths[0], res.widths[1], "binding was rendered");
+  is(res.anonChildCount, 2, "correct number of anon children");
+
+  iframe.src = "http://noxul.example.com/tests/dom/xbl/test/file_bug591198_inner.html";
+  res = (yield);
+  is(res.widths[0], res.widths[1], "binding was not rendered");
+  isnot(res.widths[0], res.widths[2], "binding was not rendered");
+  is("anonChildCount" in res, false, "no anon children");
+
+  SimpleTest.finish();
+  yield undefined;
+}
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug639338.xhtml b/dom/xbl/test/test_bug639338.xhtml
new file mode 100644
index 0000000000..e88ff1abcc
--- /dev/null
+++ b/dom/xbl/test/test_bug639338.xhtml
@@ -0,0 +1,66 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=403162
+-->
+<head>
+  <title>Test for Bug 639338</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="test">
+      <handlers>
+        <handler event="DOMMouseScroll" action="XPCNativeWrapper.unwrap(window).triggerCount++" allowuntrusted="true"/>
+        <handler event="DOMMouseScroll" modifiers="shift" action="XPCNativeWrapper.unwrap(window).shiftCount++" allowuntrusted="true"/>
+        <handler event="DOMMouseScroll" modifiers="control" action="XPCNativeWrapper.unwrap(window).controlCount++" allowuntrusted="true"/>
+      </handlers>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=639338">Mozilla Bug 639338</a>
+<p id="display" style="-moz-binding: url(#test)"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+var triggerCount = 0;
+var shiftCount = 0;
+var controlCount = 0;
+
+function dispatchEvent(t, controlKey, shiftKey) {
+  var ev = document.createEvent("MouseScrollEvents");
+  ev.initMouseScrollEvent("DOMMouseScroll", true, true, window, 0, 0, 0, 0, 0, controlKey, false, shiftKey, false, 0, null, 0);
+  t.dispatchEvent(ev);  
+}
+
+/** Test for Bug 403162 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var t = $("display");
+  is(triggerCount, 0, "Haven't dispatched event");
+
+  dispatchEvent(t, false, false);
+  is(triggerCount, 1, "Dispatched once");
+  is(shiftCount, 0, "Not shift");
+  is(controlCount, 0, "Not control");
+
+  dispatchEvent(t, false, true);
+  is(triggerCount, 2, "Dispatched twice");
+  is(shiftCount, 1, "Shift");
+  is(controlCount, 0, "Not control");
+
+  dispatchEvent(t, true, false);
+  is(triggerCount, 3, "Dispatched thrice");
+  is(shiftCount, 1, "Not shift");
+  is(controlCount, 1, "Control");
+
+  SimpleTest.finish();
+});
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug721452.xul b/dom/xbl/test/test_bug721452.xul
new file mode 100644
index 0000000000..d1393d5422
--- /dev/null
+++ b/dom/xbl/test/test_bug721452.xul
@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>      
+
+<script>
+ok(true, "Handler with empty action didn't crash")
+</script>
+
+<body xmlns="http://www.w3.org/1999/xhtml"/>
+
+<box style="-moz-binding: url(#binding)"/>
+
+<xbl:bindings xmlns:xbl="http://www.mozilla.org/xbl">
+  <xbl:binding id="binding">
+    <xbl:content/>
+    <xbl:handlers>
+      <xbl:handler nt="action" action=""/>
+    </xbl:handlers>
+  </xbl:binding>
+</xbl:bindings>
+
+</window>
diff --git a/dom/xbl/test/test_bug723676.xul b/dom/xbl/test/test_bug723676.xul
new file mode 100644
index 0000000000..29561a57e7
--- /dev/null
+++ b/dom/xbl/test/test_bug723676.xul
@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>      
+
+<script>
+ok(true, "Method with empty body didn't crash");
+</script>
+
+<body xmlns="http://www.w3.org/1999/xhtml"/>
+
+<box style="-moz-binding: url(#binding)"/>
+
+<xbl:bindings xmlns:xbl="http://www.mozilla.org/xbl">
+  <xbl:binding id="binding">
+    <xbl:implementation>
+      <xbl:method name="init"/>
+    </xbl:implementation>
+  </xbl:binding>
+</xbl:bindings>
+
+
+</window>
diff --git a/dom/xbl/test/test_bug772966.xul b/dom/xbl/test/test_bug772966.xul
new file mode 100644
index 0000000000..d58d5525d2
--- /dev/null
+++ b/dom/xbl/test/test_bug772966.xul
@@ -0,0 +1,42 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=772966
+-->
+<window title="Mozilla Bug 772966"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="runTest()">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=772966"
+     target="_blank">Mozilla Bug 772966</a>
+  </body>
+
+  <script>
+    function runTest() {
+      is(document.getElementById('b').test(123, 123, 123), 2, "Should have 2 params.");
+    }
+  </script>
+  
+  <box id="b" style="-moz-binding: url(#binding)"/>
+  
+  <xbl:bindings xmlns:xbl="http://www.mozilla.org/xbl">
+    <xbl:binding id="binding">
+      <xbl:implementation>
+        <xbl:method name="test">
+          <xbl:parameter name="p1"/>
+          <xbl:parameter name=""/>
+          <xbl:parameter name="p2"/>
+          <xbl:body><![CDATA[
+            return arguments.callee.length;
+          ]]></xbl:body>
+        </xbl:method>
+      </xbl:implementation>
+    </xbl:binding>
+  </xbl:bindings>
+  
+
+</window>
diff --git a/dom/xbl/test/test_bug790265.xhtml b/dom/xbl/test/test_bug790265.xhtml
new file mode 100644
index 0000000000..1ce8363a7e
--- /dev/null
+++ b/dom/xbl/test/test_bug790265.xhtml
@@ -0,0 +1,55 @@
+<?xml version="1.0"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=790265
+-->
+<head>
+  <title>Test for Bug 790265</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="binding">
+      <implementation>
+        <method name="foo" exposeToUntrustedContent="true">
+          <body><![CDATA[
+            return this;
+          ]]></body>
+        </method>
+      </implementation>
+    </binding>
+  </bindings>
+  <style>
+    #toBind { display: none; }
+    #toBind.bound { -moz-binding: url(#binding); }
+  </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=790265">Mozilla Bug 790265</a>
+<p id="display"></p>
+<div id="content">
+  <div id="toBind">Bound element</div>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+  SimpleTest.waitForExplicitFinish();
+  // Flush out style on $("toBind")
+  $("toBind").offsetWidth;
+  ok(!("foo" in $("toBind")), "Should not have binding applied");
+  is(getComputedStyle($("toBind")).MozBinding, "none",
+     "Computed binding should be none");
+  $("toBind").className = "bound";
+  // Flush the style change, so we kick off the binding load before onload
+  // fires and thus block onload.
+  $("toBind").offsetWidth;
+  addLoadEvent(function() {
+    ok("foo" in $("toBind"), "Should have binding applied");
+    is($("toBind").foo(), $("toBind"), "Should have correct return value");
+    SimpleTest.finish();
+  });
+]]>
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/xbl/test/test_bug821850.html b/dom/xbl/test/test_bug821850.html
new file mode 100644
index 0000000000..9ac7cdc61a
--- /dev/null
+++ b/dom/xbl/test/test_bug821850.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=821850
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 821850</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for XBL scope behavior. **/
+  SimpleTest.waitForExplicitFinish();
+
+  // Embed the real test. It will take care of everything else.
+  //
+  // NB: This two-layer setup used to exist because XBL scopes were behind a
+  // pref, and we wanted to make sure that we properly set the pref before
+  // loading the real test. This stuff is no longer behind a pref, but we just
+  // leave the structure as-is for expediency.
+  function setup() {
+    $('ifr').setAttribute('src', 'file_bug821850.xhtml');
+  }
+
+  </script>
+</head>
+<body onload="setup();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=821850">Mozilla Bug 821850</a>
+<p id="display"></p>
+<div id="content">
+<iframe id="ifr"></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug844783.html b/dom/xbl/test/test_bug844783.html
new file mode 100644
index 0000000000..ba99f08f11
--- /dev/null
+++ b/dom/xbl/test/test_bug844783.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=844783
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 844783</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for XBL running in content scope for XUL-whitelisted domains. **/
+  SimpleTest.waitForExplicitFinish();
+
+  // Disable the automation pref before loading the test to make sure we load
+  // the proper configuration.
+  function setup() {
+    SpecialPowers.pushPrefEnv({clear: [['dom.use_xbl_scopes_for_remote_xul']] }, continueSetup);
+  }
+
+  // Embed the real test. It will take care of everything else.
+  function continueSetup() {
+    $('ifr').setAttribute('src', 'file_bug844783.xhtml');
+  }
+
+  </script>
+</head>
+<body onload="setup();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=844783">Mozilla Bug 844783</a>
+<p id="display"></p>
+<div id="content">
+<iframe id="ifr"></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug872273.xhtml b/dom/xbl/test/test_bug872273.xhtml
new file mode 100644
index 0000000000..18417028c3
--- /dev/null
+++ b/dom/xbl/test/test_bug872273.xhtml
@@ -0,0 +1,53 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=872273
+-->
+<head>
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="foo">
+      <implementation>
+        <method name="throwSomething" exposeToUntrustedContent="true">
+          <body>
+            throw new Error("foopy");
+          </body>
+        </method>
+      </implementation>
+    </binding>
+  </bindings>
+  <title>Test for Bug 872273</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=872273">Mozilla Bug 872273</a>
+<p id="display" style="-moz-binding: url(#foo)"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 872273 **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+
+  // Prevent the test from failing when the exception hits onerror.
+  SimpleTest.expectUncaughtException();
+
+  // Tell the test to expect exactly one console error with the given parameters,
+  // with SimpleTest.finish as a continuation function.
+  SimpleTest.monitorConsole(SimpleTest.finish, [{errorMessage: new RegExp('foopy')}]);
+
+  // Schedule the console accounting (and continuation) to run next, right
+  // after we throw (below).
+  SimpleTest.executeSoon(SimpleTest.endMonitorConsole);
+
+  // Throw.
+  $('display').throwSomething();
+});
+
+]]>
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/xbl/test/test_bug944407.xul b/dom/xbl/test/test_bug944407.xul
new file mode 100644
index 0000000000..1efc82c038
--- /dev/null
+++ b/dom/xbl/test/test_bug944407.xul
@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=944407
+-->
+<window title="Mozilla Bug 944407"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=944407"
+     target="_blank">Mozilla Bug 944407</a>
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript">
+  <![CDATA[
+
+  /** Test for XBL bindings with script disabled. **/
+  SimpleTest.waitForExplicitFinish();
+  const Cu = Components.utils;
+  Cu.import('resource://gre/modules/Services.jsm');
+
+  function go() {
+
+    // Disable javascript, and load the frame.
+    function loadFrame() {
+      ok(!Services.prefs.getBoolPref('javascript.enabled'), "Javascript should be disabled");
+      $('ifr').setAttribute('src', 'http://mochi.test:8888/tests/dom/xbl/test/file_bug944407.html');
+    }
+    SpecialPowers.pushPrefEnv({ set: [['javascript.enabled', false]] }, loadFrame);
+  }
+
+  function finish() {
+    SimpleTest.finish();
+  }
+
+  addLoadEvent(go);
+  ]]>
+  </script>
+  <iframe id='ifr' />
+</window>
diff --git a/dom/xbl/test/test_bug950909.xul b/dom/xbl/test/test_bug950909.xul
new file mode 100644
index 0000000000..2147b0fcd2
--- /dev/null
+++ b/dom/xbl/test/test_bug950909.xul
@@ -0,0 +1,36 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=950909
+-->
+<window title="Mozilla Bug 950909"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=950909"
+     target="_blank">Mozilla Bug 950909</a>
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript">
+  <![CDATA[
+
+  /*
+   * Test for bug 950909. This has to be a chrome tests because content needs
+   * to apply a chrome binding (file_bug950909.xml), which will only be registered
+   * as a chrome:// URI during mochitest-chrome runs. And the binding has to be
+   * served from a chrome origin, because otherwise implements="nsIFoo" attributes
+   * are ignored. So this test needs 3 files, all told. Ugh.
+   */
+
+  // Just wait. When the iframe loads, it'll apply the binding, which will
+  // trigger the constructor for the binding.
+  SimpleTest.waitForExplicitFinish();
+
+  ]]>
+  </script>
+  <iframe src="http://example.com/tests/dom/xbl/test/file_bug950909.html"/>
+</window>
diff --git a/dom/xbl/test/test_fieldScopeChain.html b/dom/xbl/test/test_fieldScopeChain.html
new file mode 100644
index 0000000000..c688ca64fa
--- /dev/null
+++ b/dom/xbl/test/test_fieldScopeChain.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1095660
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug </title>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug  **/
+  SimpleTest.waitForExplicitFinish();
+  window.baz = 1;
+  document.baz = 2;
+  addLoadEvent(function() {
+    is(document.querySelector("pre").bar, 2,
+       "Should have document on field scope chain");
+    SimpleTest.finish();
+  });
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1095660">Mozilla Bug </a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test" style="-moz-binding: url(file_fieldScopeChain.xml#foo)">
+</pre>
+</body>
+</html>