Merge branch 'master' into Tidy-js

# Conflicts:
#	palemoon/base/content/browser-gestureSupport.js

104 files changed, 3607 insertions, 1668 deletions

diff --git a/README.md b/README.md
index cc755b1f1..09ee62fff 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ The shared Unified XUL Platform source code is referenced here as a git submodul
 
 ## Resources
 
- * [Build Pale Moon for Windows](https://forum.palemoon.org/viewtopic.php?f=19&t=13556)
- * [Build Pale Moon for Linux](https://developer.palemoon.org/Developer_Guide:Build_Instructions/Pale_Moon/Linux)
+ * [Build Pale Moon for Windows](https://developer.palemoon.org/build/windows/)
+ * [Build Pale Moon for Linux](https://developer.palemoon.org/build/linux/)
  * [Pale Moon home page](http://www.palemoon.org/)
  * [Code of Conduct, Contributing, and UXP Coding style](https://github.com/MoonchildProductions/UXP/tree/master/docs)
diff --git a/palemoon/app/Makefile.in b/palemoon/app/Makefile.in
index d008010ec..34efe931e 100644
--- a/palemoon/app/Makefile.in
+++ b/palemoon/app/Makefile.in
@@ -88,6 +88,9 @@ tools repackage:: $(PROGRAM)
 	sed -e 's/%MAC_APP_NAME%/$(MAC_APP_NAME)/' $(srcdir)/macbuild/Contents/Resources/English.lproj/InfoPlist.strings.in | iconv -f UTF-8 -t UTF-16 > '$(dist_dest)/Contents/Resources/$(AB).lproj/InfoPlist.strings'
 	rsync -a --exclude-from='$(srcdir)/macbuild/Contents/MacOS-files.in' $(DIST)/bin/ '$(dist_dest)/Contents/Resources'
 	rsync -a --include-from='$(srcdir)/macbuild/Contents/MacOS-files.in' --exclude '*' $(DIST)/bin/ '$(dist_dest)/Contents/MacOS'
+	# MacOS-files-copy.in is a list of files that should be copies rather
+	# than symlinks and placed in .app/Contents/MacOS.
+	rsync -aL --include-from='$(srcdir)/macbuild/Contents/MacOS-files-copy.in' --exclude '*' $(DIST)/bin/ '$(dist_dest)/Contents/MacOS'
 	$(RM) '$(dist_dest)/Contents/MacOS/$(PROGRAM)'
 	rsync -aL $(PROGRAM) '$(dist_dest)/Contents/MacOS'
 	cp -RL $(DIST)/branding/firefox.icns '$(dist_dest)/Contents/Resources/firefox.icns'
diff --git a/palemoon/app/macbuild/Contents/MacOS-files-copy.in b/palemoon/app/macbuild/Contents/MacOS-files-copy.in
new file mode 100644
index 000000000..628fea3fa
--- /dev/null
+++ b/palemoon/app/macbuild/Contents/MacOS-files-copy.in
@@ -0,0 +1,11 @@
+# Specifies files that should be copied (via deep copy, resolving symlinks)
+# from dist/bin to the .app/Contents/MacOS directory. Linking is preferred to
+# reduce disk I/O during builds, so just include dylibs which need to be in the
+# same directory as returned by dladdr(3).
+#
+# Some of these dylibs load other dylibs which are assumed to be siblings in
+# the same directory obtained from dladdr(3). With macOS 10.15, dladdr returns
+# absolute resolved paths which breaks this assumption if symlinks are used
+# because the symlink targets are in different directories. Hence the need for
+# them to be copied to the same directory.
+/*.dylib
diff --git a/palemoon/app/macbuild/Contents/MacOS-files.in b/palemoon/app/macbuild/Contents/MacOS-files.in
index 561366def..6f5289502 100644
--- a/palemoon/app/macbuild/Contents/MacOS-files.in
+++ b/palemoon/app/macbuild/Contents/MacOS-files.in
@@ -1,5 +1,4 @@
 /*.app/***
-/*.dylib
 /certutil
 /firefox-bin
 /gtest/***
diff --git a/palemoon/app/profile/palemoon.js b/palemoon/app/profile/palemoon.js
index fa02689ea..74100ed3e 100644
--- a/palemoon/app/profile/palemoon.js
+++ b/palemoon/app/profile/palemoon.js
@@ -329,6 +329,10 @@ pref("browser.identity.display_punycode", 1);
 // Address bar RSS icon control, show by default
 pref("browser.urlbar.rss", true);
 
+// If changed to true, copying the entire URL from the location bar will put
+// the human readable (percent-decoded) URL on the clipboard.
+pref("browser.urlbar.decodeURLsOnCopy", false);
+
 pref("browser.altClickSave", true);
 
 // Enable logging downloads operations to the Error Console.
@@ -870,7 +874,7 @@ pref("browser.sessionstore.restore_pinned_tabs_on_demand", false);
 // 0 = pull fully from cache
 // 1 = perform a soft refresh when restoring a tab (check network)
 // 2 = perform a hard refresh when restoring a tab (bypass cache completely)
-pref("browser.sessionstore.cache_behavior", 1);
+pref("browser.sessionstore.cache_behavior", 0);
 // Pale Moon: Allow exact positioning of windows to previous locations, even
 // if they would be outside of the screen bounds
 pref("browser.sessionstore.exactPos", false);
@@ -948,6 +952,9 @@ pref("security.alternate_certificate_error_page", "certerror");
 // Whether to start the private browsing mode at application startup
 pref("browser.privatebrowsing.autostart", false);
 
+// Whether to immediately open the bookmark edit panel for new bookmarks
+pref("browser.bookmarks.editDialog.showForNewBookmarks", false);
+
 // Don't try to alter this pref, it'll be reset the next time you use the
 // bookmarking dialog
 pref("browser.bookmarks.editDialog.firstEditField", "namePicker");
diff --git a/palemoon/base/content/browser-gestureSupport.js b/palemoon/base/content/browser-gestureSupport.js
index 9dd994c32..062bc2078 100644
--- a/palemoon/base/content/browser-gestureSupport.js
+++ b/palemoon/base/content/browser-gestureSupport.js
@@ -25,22 +25,18 @@ var gGestureSupport = {
    *        True to add/init listeners and false to remove/uninit
    */
   init: function(aAddListener) {
-    // Bug 863514 - Make gesture support work in electrolysis
-    if (gMultiProcessBrowser) {
-      return;
-    }
-
-    const gestureEvents = ["SwipeGestureStart",
+    const gestureEvents = ["SwipeGestureMayStart", "SwipeGestureStart",
       "SwipeGestureUpdate", "SwipeGestureEnd", "SwipeGesture",
       "MagnifyGestureStart", "MagnifyGestureUpdate", "MagnifyGesture",
       "RotateGestureStart", "RotateGestureUpdate", "RotateGesture",
       "TapGesture", "PressTapGesture"];
 
-    let addRemove = aAddListener ? 
-                    window.addEventListener :
-                    window.removeEventListener;
+    let addRemove = aAddListener ? window.addEventListener :
+      window.removeEventListener;
 
-    gestureEvents.forEach(function(event) addRemove("Moz" + event, this, true), this);
+    for (let event of gestureEvents) {
+      addRemove("Moz" + event, this, true);
+    }
   },
 
   /**
@@ -58,14 +54,18 @@ var gGestureSupport = {
     }
 
     // Create a preference object with some defaults
-    let def = function(aThreshold, aLatched) {
-      return { threshold: aThreshold, latched: !!aLatched };
-    }
+    let def = (aThreshold, aLatched) =>
+      ({ threshold: aThreshold, latched: !!aLatched });
 
     switch (aEvent.type) {
+      case "MozSwipeGestureMayStart":
+        if (this._shouldDoSwipeGesture(aEvent)) {
+          aEvent.preventDefault();
+        }
+        break;
       case "MozSwipeGestureStart":
         aEvent.preventDefault();
-        this._setupSwipeGesture(aEvent);
+        this._setupSwipeGesture();
         break;
       case "MozSwipeGestureUpdate":
         aEvent.preventDefault();
@@ -126,9 +126,8 @@ var gGestureSupport = {
    */
   _setupGesture: function(aEvent, aGesture, aPref, aInc, aDec) {
     // Try to load user-set values from preferences
-    for (let [pref, def] in Iterator(aPref)) {
+    for (let [pref, def] in Iterator(aPref))
       aPref[pref] = this._getPref(aGesture + "." + pref, def);
-    }
 
     // Keep track of the total deltas and latching behavior
     let offset = 0;
@@ -171,37 +170,50 @@ var gGestureSupport = {
    * @return true if the swipe event may navigate the history, false othwerwise.
    */
   _swipeNavigatesHistory: function(aEvent) {
-    return this._getCommand(aEvent, ["swipe", "left"]) == "Browser:BackOrBackDuplicate" &&
-           this._getCommand(aEvent, ["swipe", "right"]) == "Browser:ForwardOrForwardDuplicate";
+    return this._getCommand(aEvent, ["swipe", "left"])
+              == "Browser:BackOrBackDuplicate" &&
+           this._getCommand(aEvent, ["swipe", "right"])
+              == "Browser:ForwardOrForwardDuplicate";
   },
 
   /**
-   * Sets up the history swipe animations for a swipe gesture event, if enabled.
+   * Checks whether we want to start a swipe for aEvent and sets
+   * aEvent.allowedDirections to the right values.
    *
    * @param aEvent
-   *        The swipe gesture start event.
+   *        The swipe gesture "MayStart" event.
+   * @return true if we're willing to start a swipe for this event, false
+   *         otherwise.
    */
-  _setupSwipeGesture: function(aEvent) {
-    if (!this._swipeNavigatesHistory(aEvent)) {
-      return;
-    }
+  _shouldDoSwipeGesture: function(aEvent) {
+    if (!this._swipeNavigatesHistory(aEvent))
+      return false;
 
     let canGoBack = gHistorySwipeAnimation.canGoBack();
     let canGoForward = gHistorySwipeAnimation.canGoForward();
     let isLTR = gHistorySwipeAnimation.isLTR;
 
-    if (canGoBack) {
-      aEvent.allowedDirections |= isLTR ? 
-                                  aEvent.DIRECTION_LEFT :
-                                  aEvent.DIRECTION_RIGHT;
-    }
-    if (canGoForward) {
-      aEvent.allowedDirections |= isLTR ?
-                                  aEvent.DIRECTION_RIGHT :
-                                  aEvent.DIRECTION_LEFT;
-    }
+    if (canGoBack)
+      aEvent.allowedDirections |= isLTR ? aEvent.DIRECTION_LEFT :
+                                          aEvent.DIRECTION_RIGHT;
+    if (canGoForward)
+      aEvent.allowedDirections |= isLTR ? aEvent.DIRECTION_RIGHT :
+                                          aEvent.DIRECTION_LEFT;
 
-    gHistorySwipeAnimation.startAnimation();
+    return true;
+  },
+
+  /**
+   * Sets up swipe gestures. This includes setting up swipe animations for the
+   * gesture, if enabled.
+   *
+   * @param aEvent
+   *        The swipe gesture start event.
+   * @return true if swipe gestures could successfully be set up, false
+   *         othwerwise.
+   */
+  _setupSwipeGesture: function() {
+    gHistorySwipeAnimation.startAnimation(false);
 
     this._doUpdate = function(aEvent) {
       gHistorySwipeAnimation.updateAnimation(aEvent.delta);
@@ -210,8 +222,8 @@ var gGestureSupport = {
     this._doEnd = function(aEvent) {
       gHistorySwipeAnimation.swipeEndEventReceived();
 
-      this._doUpdate = function(aEvent) { };
-      this._doEnd = function(aEvent) { };
+      this._doUpdate = function(aEvent) {};
+      this._doEnd = function(aEvent) {};
     }
   },
 
@@ -229,9 +241,8 @@ var gGestureSupport = {
     while (--num >= 0) {
       // Only select array elements where the current bit is set
       yield aArray.reduce(function(aPrev, aCurr, aIndex) {
-        if (num & 1 << aIndex) {
+        if (num & 1 << aIndex)
           aPrev.push(aCurr);
-        }
         return aPrev;
       }, []);
     }
@@ -268,9 +279,8 @@ var gGestureSupport = {
     // command for both don't exist)
     let keyCombos = [];
     ["shift", "alt", "ctrl", "meta"].forEach(function(key) {
-      if (aEvent[key + "Key"]) {
+      if (aEvent[key + "Key"])
         keyCombos.push(key);
-      }
     });
 
     // Try each combination of key presses in decreasing order for commands
@@ -281,12 +291,10 @@ var gGestureSupport = {
       let command;
       try {
         command = this._getPref(aGesture.concat(subCombo).join("."));
-      } catch(e) {
-      }
+      } catch (e) {}
 
-      if (command) {
+      if (command)
         return command;
-      }
     }
     return null;
   },
@@ -310,7 +318,8 @@ var gGestureSupport = {
         node.dispatchEvent(cmdEvent);
       }
 
-    } else {
+    }
+    else {
       goDoCommand(aCommand);
     }
   },
@@ -322,7 +331,7 @@ var gGestureSupport = {
    * @param aEvent
    *        The continual motion update event to handle
    */
-  _doUpdate: function(aEvent) { },
+  _doUpdate: function(aEvent) {},
 
   /**
    * Handle gesture end events.  This function will be set by _setupSwipe.
@@ -330,7 +339,7 @@ var gGestureSupport = {
    * @param aEvent
    *        The gesture end event to handle
    */
-  _doEnd: function(aEvent) { },
+  _doEnd: function(aEvent) {},
 
   /**
    * Convert the swipe gesture into a browser action based on the direction.
@@ -371,11 +380,13 @@ var gGestureSupport = {
    * @param aDir
    *        The direction for the swipe event
    */
-  _coordinateSwipeEventWithAnimation: function(aEvent, aDir) {
+  _coordinateSwipeEventWithAnimation:
+  function(aEvent, aDir) {
     if ((gHistorySwipeAnimation.isAnimationRunning()) &&
         (aDir == "RIGHT" || aDir == "LEFT")) {
       gHistorySwipeAnimation.processSwipeEvent(aEvent, aDir);
-    } else {
+    }
+    else {
       this.processSwipeEvent(aEvent, aDir);
     }
   },
@@ -395,13 +406,11 @@ var gGestureSupport = {
     try {
       // Determine what type of data to load based on default value's type
       let type = typeof aDef;
-      let getFunc = "get" + (type == "boolean" ? 
-                                     "Bool" :
-                                     type == "number" ?
-                                             "Int" :
-                                             "Char") + "Pref";
+      let getFunc = "get" + (type == "boolean" ? "Bool" :
+                             type == "number" ? "Int" : "Char") + "Pref";
       return gPrefService[getFunc](branch + aPref);
-    } catch(e) {
+    }
+    catch (e) {
       return aDef;
     }
   },
@@ -413,18 +422,15 @@ var gGestureSupport = {
    *        The MozRotateGestureUpdate event triggering this call
    */
   rotate: function(aEvent) {
-    if (!(content.document instanceof ImageDocument)) {
+    if (!(content.document instanceof ImageDocument))
       return;
-    }
 
     let contentElement = content.document.body.firstElementChild;
-    if (!contentElement) {
+    if (!contentElement)
       return;
-    }
     // If we're currently snapping, cancel that snap
-    if (contentElement.classList.contains("completeRotation")) {
+    if (contentElement.classList.contains("completeRotation"))
       this._clearCompleteRotation();
-    }
 
     this.rotation = Math.round(this.rotation + aEvent.delta);
     contentElement.style.transform = "rotate(" + this.rotation + "deg)";
@@ -435,41 +441,37 @@ var gGestureSupport = {
    * Perform a rotation end for ImageDocuments
    */
   rotateEnd: function() {
-    if (!(content.document instanceof ImageDocument)) {
+    if (!(content.document instanceof ImageDocument))
       return;
-    }
 
     let contentElement = content.document.body.firstElementChild;
-    if (!contentElement) {
+    if (!contentElement)
       return;
-    }
 
     let transitionRotation = 0;
 
     // The reason that 360 is allowed here is because when rotating between
     // 315 and 360, setting rotate(0deg) will cause it to rotate the wrong
     // direction around--spinning wildly.
-    if (this.rotation <= 45) {
+    if (this.rotation <= 45)
       transitionRotation = 0;
-    } else if (this.rotation > 45 && this.rotation <= 135) {
+    else if (this.rotation > 45 && this.rotation <= 135)
       transitionRotation = 90;
-    } else if (this.rotation > 135 && this.rotation <= 225) {
+    else if (this.rotation > 135 && this.rotation <= 225)
       transitionRotation = 180;
-    } else if (this.rotation > 225 && this.rotation <= 315) {
+    else if (this.rotation > 225 && this.rotation <= 315)
       transitionRotation = 270;
-    } else {
+    else
       transitionRotation = 360;
-    }
 
     // If we're going fast enough, and we didn't already snap ahead of rotation,
     // then snap ahead of rotation to simulate momentum
     if (this._lastRotateDelta > this._rotateMomentumThreshold &&
-        this.rotation > transitionRotation) {
+        this.rotation > transitionRotation)
       transitionRotation += 90;
-    } else if (this._lastRotateDelta < -1 * this._rotateMomentumThreshold &&
-               this.rotation < transitionRotation) {
+    else if (this._lastRotateDelta < -1 * this._rotateMomentumThreshold &&
+             this.rotation < transitionRotation)
       transitionRotation -= 90;
-    }
 
     // Only add the completeRotation class if it is is necessary
     if (transitionRotation != this.rotation) {
@@ -497,9 +499,8 @@ var gGestureSupport = {
    */
   set rotation(aVal) {
     this._currentRotation = aVal % 360;
-    if (this._currentRotation < 0) {
+    if (this._currentRotation < 0)
       this._currentRotation += 360;
-    }
     return this._currentRotation;
   },
 
@@ -508,14 +509,8 @@ var gGestureSupport = {
    * image
    */
   restoreRotationState: function() {
-    // Bug 863514 - Make gesture support work in electrolysis
-    if (gMultiProcessBrowser) {
+    if (!(content.document instanceof ImageDocument))
       return;
-    }
-
-    if (!(content.document instanceof ImageDocument)) {
-      return;
-    }
 
     let contentElement = content.document.body.firstElementChild;
     let transformValue = content.window.getComputedStyle(contentElement, null)
@@ -543,9 +538,8 @@ var gGestureSupport = {
                          content.document instanceof ImageDocument &&
                          content.document.body &&
                          content.document.body.firstElementChild;
-    if (!contentElement) {
+    if (!contentElement)
       return;
-    }
     contentElement.classList.remove("completeRotation");
     contentElement.removeEventListener("transitionend", this._clearCompleteRotation);
   },
@@ -562,12 +556,11 @@ var gHistorySwipeAnimation = {
    * by the platform/configuration.
    */
   init: function() {
-    if (!this._isSupported()) {
+    if (!this._isSupported())
       return;
-    }
 
     this.active = false;
-    this.isLTR = document.documentElement.mozMatchesSelector(":-moz-locale-dir(ltr)");
+    this.isLTR = document.documentElement.matches(":-moz-locale-dir(ltr)");
     this._trackedSnapshots = [];
     this._historyIndex = -1;
     this._boxWidth = -1;
@@ -581,6 +574,7 @@ var gHistorySwipeAnimation = {
       gBrowser.addEventListener("pagehide", this, false);
       gBrowser.addEventListener("pageshow", this, false);
       gBrowser.addEventListener("popstate", this, false);
+      gBrowser.addEventListener("DOMModalDialogClosed", this, false);
       gBrowser.tabContainer.addEventListener("TabClose", this, false);
     }
   },
@@ -592,6 +586,7 @@ var gHistorySwipeAnimation = {
     gBrowser.removeEventListener("pagehide", this, false);
     gBrowser.removeEventListener("pageshow", this, false);
     gBrowser.removeEventListener("popstate", this, false);
+    gBrowser.removeEventListener("DOMModalDialogClosed", this, false);
     gBrowser.tabContainer.removeEventListener("TabClose", this, false);
 
     this.active = false;
@@ -609,7 +604,8 @@ var gHistorySwipeAnimation = {
       this._canGoBack = this.canGoBack();
       this._canGoForward = this.canGoForward();
       this._handleFastSwiping();
-    } else {
+    }
+    else {
       this._historyIndex = gBrowser.webNavigation.sessionHistory.index;
       this._canGoBack = this.canGoBack();
       this._canGoForward = this.canGoForward();
@@ -628,6 +624,7 @@ var gHistorySwipeAnimation = {
    */
   stopAnimation: function() {
     gHistorySwipeAnimation._removeBoxes();
+    this._historyIndex = gBrowser.webNavigation.sessionHistory.index;
   },
 
   /**
@@ -638,22 +635,18 @@ var gHistorySwipeAnimation = {
    *        swipe gesture.
    */
   updateAnimation: function(aVal) {
-    if (!this.isAnimationRunning()) {
+    if (!this.isAnimationRunning())
       return;
-    }
 
     if ((aVal >= 0 && this.isLTR) ||
         (aVal <= 0 && !this.isLTR)) {
-      if (aVal > 1) {
-        // Cap value to avoid sliding the page further than allowed.
-        aVal = 1;
-      }
+      if (aVal > 1)
+        aVal = 1; // Cap value to avoid sliding the page further than allowed.
 
-      if (this._canGoBack) {
+      if (this._canGoBack)
         this._prevBox.collapsed = false;
-      } else {
+      else
         this._prevBox.collapsed = true;
-      }
 
       // The current page is pushed to the right (LTR) or left (RTL),
       // the intention is to go back.
@@ -662,12 +655,10 @@ var gHistorySwipeAnimation = {
 
       // The forward page should be pushed offscreen all the way to the right.
       this._positionBox(this._nextBox, 1);
-    } else {
-      if (aVal < -1) {
-        // Cap value to avoid sliding the page further than allowed.
-        aVal = -1;
-      }
-
+    }
+    else {
+      if (aVal < -1)
+        aVal = -1; // Cap value to avoid sliding the page further than allowed.
       // The intention is to go forward. If there is a page to go forward to,
       // it should slide in from the right (LTR) or left (RTL).
       // Otherwise, the current page should slide to the left (LTR) or
@@ -675,10 +666,12 @@ var gHistorySwipeAnimation = {
       // For the backdrop to be visible in that case, the previous page needs
       // to be hidden (if it exists).
       if (this._canGoForward) {
+        this._nextBox.collapsed = false;
         let offset = this.isLTR ? 1 : -1;
         this._positionBox(this._curBox, 0);
-        this._positionBox(this._nextBox, offset + aVal); // aVal is negative
-      } else {
+        this._positionBox(this._nextBox, offset + aVal); // aval is negative
+      }
+      else {
         this._prevBox.collapsed = true;
         this._positionBox(this._curBox, aVal);
       }
@@ -692,25 +685,34 @@ var gHistorySwipeAnimation = {
    *        An event to process.
    */
   handleEvent: function(aEvent) {
+    let browser = gBrowser.selectedBrowser;
     switch (aEvent.type) {
       case "TabClose":
-        let browser = gBrowser.getBrowserForTab(aEvent.target);
-        this._removeTrackedSnapshot(-1, browser);
+        let browserForTab = gBrowser.getBrowserForTab(aEvent.target);
+        this._removeTrackedSnapshot(-1, browserForTab);
+        break;
+      case "DOMModalDialogClosed":
+        this.stopAnimation();
         break;
       case "pageshow":
+        if (aEvent.target == browser.contentDocument) {
+          this.stopAnimation();
+        }
+        break;
       case "popstate":
-        if (this.isAnimationRunning()) {
-          if (aEvent.target != gBrowser.selectedBrowser.contentDocument)
-            break;
+        if (aEvent.target == browser.contentDocument.defaultView) {
           this.stopAnimation();
         }
-        this._historyIndex = gBrowser.webNavigation.sessionHistory.index;
         break;
       case "pagehide":
-        if (aEvent.target == gBrowser.selectedBrowser.contentDocument) {
-          // Take a snapshot of a page whenever it's about to be navigated away
-          // from.
-          this._takeSnapshot();
+        if (aEvent.target == browser.contentDocument) {
+          // Take and compress a snapshot of a page whenever it's about to be
+          // navigated away from. We already have a snapshot of the page if an
+          // animation is running, so we're left with compressing it.
+          if (!this.isAnimationRunning()) {
+            this._takeSnapshot();
+          }
+          this._compressSnapshotAtCurrentIndex();
         }
         break;
     }
@@ -734,13 +736,12 @@ var gHistorySwipeAnimation = {
    *        The direction for the swipe event
    */
   processSwipeEvent: function(aEvent, aDir) {
-    if (aDir == "RIGHT") {
+    if (aDir == "RIGHT")
       this._historyIndex += this.isLTR ? 1 : -1;
-    } else if (aDir == "LEFT") {
+    else if (aDir == "LEFT")
       this._historyIndex += this.isLTR ? -1 : 1;
-    } else {
+    else
       return;
-    }
     this._lastSwipeDir = aDir;
   },
 
@@ -750,9 +751,8 @@ var gHistorySwipeAnimation = {
    * @return true if there is a previous page in history, false otherwise.
    */
   canGoBack: function() {
-    if (this.isAnimationRunning()) {
+    if (this.isAnimationRunning())
       return this._doesIndexExistInHistory(this._historyIndex - 1);
-    }
     return gBrowser.webNavigation.canGoBack;
   },
 
@@ -762,9 +762,8 @@ var gHistorySwipeAnimation = {
    * @return true if there is a next page in history, false otherwise.
    */
   canGoForward: function() {
-    if (this.isAnimationRunning()) {
+    if (this.isAnimationRunning())
       return this._doesIndexExistInHistory(this._historyIndex + 1);
-    }
     return gBrowser.webNavigation.canGoForward;
   },
 
@@ -774,11 +773,10 @@ var gHistorySwipeAnimation = {
    * any. This will also result in the animation overlay to be torn down.
    */
   swipeEndEventReceived: function() {
-    if (this._lastSwipeDir != "") {
+    if (this._lastSwipeDir != "")
       this._navigateToHistoryIndex();
-    } else {
+    else
       this.stopAnimation();
-    }
   },
 
   /**
@@ -791,7 +789,8 @@ var gHistorySwipeAnimation = {
   _doesIndexExistInHistory: function(aIndex) {
     try {
       gBrowser.webNavigation.sessionHistory.getEntryAtIndex(aIndex, false);
-    } catch(ex) {
+    }
+    catch(ex) {
       return false;
     }
     return true;
@@ -802,9 +801,10 @@ var gHistorySwipeAnimation = {
    * |this|.
    */
   _navigateToHistoryIndex: function() {
-    if (this._doesIndexExistInHistory(this._historyIndex)) {
+    if (this._doesIndexExistInHistory(this._historyIndex))
       gBrowser.webNavigation.gotoIndex(this._historyIndex);
-    }
+    else
+      this.stopAnimation();
   },
 
   /**
@@ -860,9 +860,8 @@ var gHistorySwipeAnimation = {
     this._curBox = null;
     this._prevBox = null;
     this._nextBox = null;
-    if (this._container) {
+    if (this._container)
       this._container.parentNode.removeChild(this._container);
-    }
     this._container = null;
     this._boxWidth = -1;
   },
@@ -893,28 +892,48 @@ var gHistorySwipeAnimation = {
    */
   _positionBox: function(aBox, aPosition) {
     aBox.style.transform = "translateX(" + this._boxWidth * aPosition + "px)";
+    let transform = "";
+
+    aBox.style.transform = transform;
   },
 
   /**
-   * Takes a snapshot of the page the browser is currently on.
+   * Verifies that we're ready to take snapshots based on the global pref and
+   * the current index in history.
+   *
+   * @return true if we're ready to take snapshots, false otherwise.
    */
-  _takeSnapshot: function() {
+  _readyToTakeSnapshots: function() {
     if ((this._maxSnapshots < 1) ||
         (gBrowser.webNavigation.sessionHistory.index < 0)) {
+      return false;
+    }
+    return true;
+  },
+
+  /**
+   * Takes a snapshot of the page the browser is currently on.
+   */
+  _takeSnapshot: function() {
+    if (!this._readyToTakeSnapshots()) {
       return;
     }
 
+    let canvas = null;
+
     let browser = gBrowser.selectedBrowser;
     let r = browser.getBoundingClientRect();
-    let canvas = document.createElementNS("http://www.w3.org/1999/xhtml",
-                                          "canvas");
+    canvas = document.createElementNS("http://www.w3.org/1999/xhtml",
+                                      "canvas");
     canvas.mozOpaque = true;
-    canvas.width = r.width;
-    canvas.height = r.height;
+    let scale = window.devicePixelRatio;
+    canvas.width = r.width * scale;
+    canvas.height = r.height * scale;
     let ctx = canvas.getContext("2d");
-    let zoom = browser.markupDocumentViewer.fullZoom;
+    let zoom = browser.markupDocumentViewer.fullZoom * scale;
     ctx.scale(zoom, zoom);
-    ctx.drawWindow(browser.contentWindow, 0, 0, r.width, r.height, "white",
+    ctx.drawWindow(browser.contentWindow,
+                   0, 0, canvas.width / zoom, canvas.height / zoom, "white",
                    ctx.DRAWWINDOW_DO_NOT_FLUSH | ctx.DRAWWINDOW_DRAW_VIEW |
                    ctx.DRAWWINDOW_ASYNC_DECODE_IMAGES |
                    ctx.DRAWWINDOW_USE_WIDGET_LAYERS);
@@ -939,25 +958,48 @@ var gHistorySwipeAnimation = {
    * @param aCanvas
    *        The snapshot to add to the list and compress.
    */
-  _assignSnapshotToCurrentBrowser: function(aCanvas) {
+  _assignSnapshotToCurrentBrowser:
+  function(aCanvas) {
     let browser = gBrowser.selectedBrowser;
     let currIndex = browser.webNavigation.sessionHistory.index;
 
     this._removeTrackedSnapshot(currIndex, browser);
     this._addSnapshotRefToArray(currIndex, browser);
 
-    if (!("snapshots" in browser)) {
+    if (!("snapshots" in browser))
       browser.snapshots = [];
-    }
     let snapshots = browser.snapshots;
     // Temporarily store the canvas as the compressed snapshot.
     // This avoids a blank page if the user swipes quickly
     // between pages before the compression could complete.
-    snapshots[currIndex] = aCanvas;
+    snapshots[currIndex] = {
+      image: aCanvas,
+      scale: window.devicePixelRatio
+    };
+  },
+
+  /**
+   * Compresses the HTMLCanvasElement that's stored at the current history
+   * index in the snapshot array and stores the compressed image in its place.
+   */
+  _compressSnapshotAtCurrentIndex:
+  function() {
+    if (!this._readyToTakeSnapshots()) {
+      // We didn't take a snapshot earlier because we weren't ready to, so
+      // there's nothing to compress.
+      return;
+    }
+
+    let browser = gBrowser.selectedBrowser;
+    let snapshots = browser.snapshots;
+    let currIndex = browser.webNavigation.sessionHistory.index;
 
     // Kick off snapshot compression.
-    aCanvas.toBlob(function(aBlob) {
-        snapshots[currIndex] = aBlob;
+    let canvas = snapshots[currIndex].image;
+    canvas.toBlob(function(aBlob) {
+        if (snapshots[currIndex]) {
+          snapshots[currIndex].image = aBlob;
+        }
       }, "image/png"
     );
   },
@@ -982,13 +1024,10 @@ var gHistorySwipeAnimation = {
           (aIndex < 0 || aIndex == arr[i].index)) {
         delete aBrowser.snapshots[arr[i].index];
         arr.splice(i, 1);
-        if (requiresExactIndexMatch) {
-          // Found and removed the only element.
-          return;
-        }
-        // Make sure to revisit the index that we just removed an
-        // element at.
-        i--;
+        if (requiresExactIndexMatch)
+          return; // Found and removed the only element.
+        i--; // Make sure to revisit the index that we just removed an
+             // element at.
       }
     }
   },
@@ -1002,7 +1041,8 @@ var gHistorySwipeAnimation = {
    * @param aBrowser
    *        The browser the new snapshot was taken in.
    */
-  _addSnapshotRefToArray: function(aIndex, aBrowser) {
+  _addSnapshotRefToArray:
+  function(aIndex, aBrowser) {
     let id = { index: aIndex,
                browser: aBrowser };
     let arr = this._trackedSnapshots;
@@ -1010,6 +1050,7 @@ var gHistorySwipeAnimation = {
 
     while (arr.length > this._maxSnapshots) {
       let lastElem = arr[arr.length - 1];
+      delete lastElem.browser.snapshots[lastElem.index].image;
       delete lastElem.browser.snapshots[lastElem.index];
       arr.splice(-1, 1);
     }
@@ -1026,22 +1067,50 @@ var gHistorySwipeAnimation = {
    * @return A new Image object representing the converted blob.
    */
   _convertToImg: function(aBlob) {
-    if (!aBlob) {
+    if (!aBlob)
       return null;
-    }
 
     // Return aBlob if it's still a canvas and not a compressed blob yet.
-    if (aBlob instanceof HTMLCanvasElement) {
+    if (aBlob instanceof HTMLCanvasElement)
       return aBlob;
-    }
 
     let img = new Image();
-    let url = URL.createObjectURL(aBlob);
-    img.onload = function() {
-      URL.revokeObjectURL(url);
-    };
-    img.src = url;
-    return img;
+    let url = "";
+    try {
+      url = URL.createObjectURL(aBlob);
+      img.onload = function() {
+        URL.revokeObjectURL(url);
+      };
+    }
+    finally {
+      img.src = url;
+      return img;
+    }
+  },
+
+  /**
+   * Scales the background of a given box element (which uses a given snapshot
+   * as background) based on a given scale factor.
+   * @param aSnapshot
+   *        The snapshot that is used as background of aBox.
+   * @param aScale
+   *        The scale factor to use.
+   * @param aBox
+   *        The box element that uses aSnapshot as background.
+   */
+  _scaleSnapshot: function(aSnapshot, aScale, aBox) {
+    if (aSnapshot && aScale != 1 && aBox) {
+      if (aSnapshot instanceof HTMLCanvasElement) {
+        aBox.style.backgroundSize =
+          aSnapshot.width / aScale + "px " + aSnapshot.height / aScale + "px";
+      } else {
+        // snapshot is instanceof HTMLImageElement
+        aSnapshot.addEventListener("load", function() {
+          aBox.style.backgroundSize =
+            aSnapshot.width / aScale + "px " + aSnapshot.height / aScale + "px";
+        });
+      }
+    }
   },
 
   /**
@@ -1053,15 +1122,20 @@ var gHistorySwipeAnimation = {
    *        The snapshot to set the current page to. If this parameter is null,
    *        the previously stored snapshot for this index (if any) will be used.
    */
-  _installCurrentPageSnapshot: function(aCanvas) {
+  _installCurrentPageSnapshot:
+  function(aCanvas) {
     let currSnapshot = aCanvas;
+    let scale = window.devicePixelRatio;
     if (!currSnapshot) {
-      let snapshots = gBrowser.selectedBrowser.snapshots || { };
+      let snapshots = gBrowser.selectedBrowser.snapshots || {};
       let currIndex = this._historyIndex;
       if (currIndex in snapshots) {
-        currSnapshot = this._convertToImg(snapshots[currIndex]);
+        currSnapshot = this._convertToImg(snapshots[currIndex].image);
+        scale = snapshots[currIndex].scale;
       }
     }
+    this._scaleSnapshot(currSnapshot, scale, this._curBox ? this._curBox :
+                                                            null);
     document.mozSetImageElement("historySwipeAnimationCurrentPageSnapshot",
                                   currSnapshot);
   },
@@ -1070,13 +1144,16 @@ var gHistorySwipeAnimation = {
    * Sets the snapshots of the previous and next pages to the snapshots
    * previously stored for their respective indeces.
    */
-  _installPrevAndNextSnapshots: function() {
+  _installPrevAndNextSnapshots:
+  function() {
     let snapshots = gBrowser.selectedBrowser.snapshots || [];
     let currIndex = this._historyIndex;
     let prevIndex = currIndex - 1;
     let prevSnapshot = null;
     if (prevIndex in snapshots) {
-      prevSnapshot = this._convertToImg(snapshots[prevIndex]);
+      prevSnapshot = this._convertToImg(snapshots[prevIndex].image);
+      this._scaleSnapshot(prevSnapshot, snapshots[prevIndex].scale,
+                          this._prevBox);
     }
     document.mozSetImageElement("historySwipeAnimationPreviousPageSnapshot",
                                 prevSnapshot);
@@ -1084,7 +1161,9 @@ var gHistorySwipeAnimation = {
     let nextIndex = currIndex + 1;
     let nextSnapshot = null;
     if (nextIndex in snapshots) {
-      nextSnapshot = this._convertToImg(snapshots[nextIndex]);
+      nextSnapshot = this._convertToImg(snapshots[nextIndex].image);
+      this._scaleSnapshot(nextSnapshot, snapshots[nextIndex].scale,
+                          this._nextBox);
     }
     document.mozSetImageElement("historySwipeAnimationNextPageSnapshot",
                                 nextSnapshot);
diff --git a/palemoon/base/content/browser-places.js b/palemoon/base/content/browser-places.js
index e8feee219..3269b3ffb 100644
--- a/palemoon/base/content/browser-places.js
+++ b/palemoon/base/content/browser-places.js
@@ -14,6 +14,10 @@ var StarUI = {
     return document.getElementById(aID);
   },
 
+  get showForNewBookmarks() {
+    return Services.prefs.getBoolPref("browser.bookmarks.editDialog.showForNewBookmarks", false);
+  },
+
   // Edit-bookmark panel
   get panel() {
     delete this.panel;
@@ -1298,7 +1302,8 @@ var BookmarkingUI = {
     }
     // Ignore clicks on the star if we are updating its state.
     if (!this._pendingStmt) {
-      PlacesCommandHook.bookmarkCurrentPage(this._itemIds.length > 0);
+      PlacesCommandHook.bookmarkCurrentPage(this._itemIds.length > 0 ||
+                                            StarUI.showForNewBookmarks);
     }
   },
 
diff --git a/palemoon/base/content/browser.css b/palemoon/base/content/browser.css
index a2970aefc..91c6478d2 100644
--- a/palemoon/base/content/browser.css
+++ b/palemoon/base/content/browser.css
@@ -106,7 +106,7 @@ toolbar[printpreview="true"] {
   -moz-box-ordinal-group: 10;
 }
 
-%ifdef CAN_DRAW_IN_TITLEBAR
+%ifdef MOZ_CAN_DRAW_IN_TITLEBAR
 #main-window[inFullscreen] > #titlebar,
 #main-window[inFullscreen] .titlebar-placeholder,
 #main-window:not([tabsintitlebar]) .titlebar-placeholder {
@@ -222,7 +222,7 @@ splitmenu {
 }
 
 %ifdef MENUBAR_CAN_AUTOHIDE
-%ifndef CAN_DRAW_IN_TITLEBAR
+%ifndef MOZ_CAN_DRAW_IN_TITLEBAR
 #appmenu-toolbar-button > .toolbarbutton-text {
   display: -moz-box;
 }
@@ -321,7 +321,7 @@ panel[noactions] > richlistbox > richlistitem[type~="action"] > .ac-url-box > .a
 }
 
 #identity-box.verifiedIdentity > #identity-icon-labels > #identity-icon-label {
-  -moz-margin-end: 0.25em !important;
+  margin-inline-end: 0.25em !important;
 }
 
 #wrapper-search-container > #search-container > #searchbar > .searchbar-textbox > .autocomplete-textbox-container > .textbox-input-box > html|*.textbox-input {
diff --git a/palemoon/base/content/browser.js b/palemoon/base/content/browser.js
index e86e5b44d..a23354e5a 100644
--- a/palemoon/base/content/browser.js
+++ b/palemoon/base/content/browser.js
@@ -4783,7 +4783,7 @@ var TabsOnTop = {
 
 var TabsInTitlebar = {
   init: function() {
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
     this._readPref();
     Services.prefs.addObserver(this._prefName, this, false);
 
@@ -4796,7 +4796,7 @@ var TabsInTitlebar = {
   },
 
   allowedBy: function(condition, allow) {
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
     if (allow) {
       if (condition in this._disallowed) {
         delete this._disallowed[condition];
@@ -4815,7 +4815,7 @@ var TabsInTitlebar = {
     return document.documentElement.getAttribute("tabsintitlebar") == "true";
   },
 
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
   observe: function(subject, topic, data) {
     if (topic == "nsPref:changed")
       this._readPref();
@@ -4890,7 +4890,7 @@ var TabsInTitlebar = {
 #endif
 
   uninit: function() {
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
     this._initialized = false;
     Services.prefs.removeObserver(this._prefName, this);
 #endif
@@ -4904,7 +4904,7 @@ function updateAppButtonDisplay() {
     window.menubar.visible &&
     document.getElementById("toolbar-menubar").getAttribute("autohide") == "true";
 
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
   document.getElementById("titlebar").hidden = !displayAppButton;
 
   if (displayAppButton) {
@@ -4921,7 +4921,7 @@ function updateAppButtonDisplay() {
 }
 #endif
 
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
 function onTitlebarMaxClick() {
   if (window.windowState == window.STATE_MAXIMIZED) {
     window.restore();
@@ -7089,7 +7089,7 @@ var gPrivateBrowsingUI = {
     document.getElementById("Tools:Sanitize").setAttribute("disabled", "true");
 
     if (window.location.href == getBrowserURL()) {
-#ifdef XP_MACOSX
+#if defined(XP_MACOSX) && defined(MOZ_CAN_DRAW_IN_TITLEBAR)
       if (!PrivateBrowsingUtils.permanentPrivateBrowsing) {
         document.documentElement.setAttribute("drawintitlebar", true);
       }
diff --git a/palemoon/base/content/browser.xul b/palemoon/base/content/browser.xul
index 0a249afa9..34c7c185d 100644
--- a/palemoon/base/content/browser.xul
+++ b/palemoon/base/content/browser.xul
@@ -324,7 +324,7 @@
 
   </popupset>
 
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
 <vbox id="titlebar">
   <hbox id="titlebar-content">
 #ifdef MENUBAR_CAN_AUTOHIDE
@@ -374,7 +374,7 @@
 #include browser-menubar.inc
       </toolbaritem>
 
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
       <hbox class="titlebar-placeholder" type="appmenu-button" ordinal="0"/>
       <hbox class="titlebar-placeholder" type="caption-buttons" ordinal="1000"/>
 #endif
@@ -771,7 +771,7 @@
     </toolbar>
 
 #ifdef MENUBAR_CAN_AUTOHIDE
-#ifndef CAN_DRAW_IN_TITLEBAR
+#ifndef MOZ_CAN_DRAW_IN_TITLEBAR
 #define APPMENU_ON_TABBAR
 #endif
 #endif
@@ -838,7 +838,7 @@
                      label="&closeTab.label;"
                      tooltiptext="&closeTab.label;"/>
 
-#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef MOZ_CAN_DRAW_IN_TITLEBAR
       <hbox class="titlebar-placeholder" type="appmenu-button" ordinal="0"/>
       <hbox class="titlebar-placeholder" type="caption-buttons" ordinal="1000"/>
 #endif
diff --git a/palemoon/base/content/urlbarBindings.xml b/palemoon/base/content/urlbarBindings.xml
index 71a74a036..ae9b8d58f 100644
--- a/palemoon/base/content/urlbarBindings.xml
+++ b/palemoon/base/content/urlbarBindings.xml
@@ -521,19 +521,17 @@
             uri = uriFixup.createExposableURI(uri);
           } catch (ex) {}
 
-          // If the entire URL is selected, just use the actual loaded URI.
-          if (inputVal == selectedVal) {
-            // ... but only if  isn't a javascript: or data: URI, since those
-            // are hard to read when encoded
-            if (!uri.schemeIs("javascript") && !uri.schemeIs("data")) {
-              selectedVal = uri.spec;
-            }
-
-            return selectedVal;
+          // If the entire URL is selected, just use the actual loaded URI,
+          // unless we want a decoded URI, or it's a data: or javascript: URI,
+          // since those are hard to read when encoded.
+          if (inputVal == selectedVal &&
+              !uri.schemeIs("javascript") && !uri.schemeIs("data") &&
+              !Services.prefs.getBoolPref("browser.urlbar.decodeURLsOnCopy")) {
+            return uri.spec;
           }
 
-          // Just the beginning of the URL is selected, check for a trimmed
-          // value
+          // Just the beginning of the URL is selected, or we want a decoded
+          // url. First check for a trimmed value.
           let spec = uri.spec;
           let trimmedSpec = this.trimValue(spec);
           if (spec != trimmedSpec) {
diff --git a/palemoon/base/moz.build b/palemoon/base/moz.build
index e81e45c23..b0a696b3f 100644
--- a/palemoon/base/moz.build
+++ b/palemoon/base/moz.build
@@ -11,9 +11,6 @@ if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'gtk2', 'gtk3', 'cocoa'):
     DEFINES['HAVE_SHELL_SERVICE'] = 1
     DEFINES['CONTEXT_COPY_IMAGE_CONTENTS'] = 1
 
-if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'cocoa'):
-    DEFINES['CAN_DRAW_IN_TITLEBAR'] = 1
-
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('windows', 'gtk2', 'gtk3'):
     DEFINES['MENUBAR_CAN_AUTOHIDE'] = 1
 
diff --git a/palemoon/branding/official/pref/palemoon-branding.js b/palemoon/branding/official/pref/palemoon-branding.js
index 3c396a9f6..f8b96cd0c 100644
--- a/palemoon/branding/official/pref/palemoon-branding.js
+++ b/palemoon/branding/official/pref/palemoon-branding.js
@@ -17,6 +17,9 @@ pref("general.useragent.updates.interval", 86400); // Once per day
 pref("general.useragent.updates.retry", 7200);     // Retry getting update every 2 hours if failed

 pref("general.useragent.updates.url", "https://dua.palemoon.org/?app=palemoon&version=%APP_VERSION%&channel=%CHANNEL%");

 

+// Geolocation

+pref("geo.wifi.uri", "https://pro.ip-api.com/json/?fields=lat,lon,status,message&key=K3TirHYiysBjnmD");

+

 // ========================= updates ========================

 #if defined(XP_WIN) || defined(XP_LINUX)

 // Updates enabled

diff --git a/palemoon/branding/shared/pref/uaoverrides.inc b/palemoon/branding/shared/pref/uaoverrides.inc
index 5a0ef27c5..50b55afd7 100644
--- a/palemoon/branding/shared/pref/uaoverrides.inc
+++ b/palemoon/branding/shared/pref/uaoverrides.inc
@@ -11,76 +11,69 @@
 #define GK_SLICE Gecko/20100101

 #define FX_SLICE Firefox/@GK_VERSION@

 

-#ifdef XP_UNIX

-#ifndef XP_MACOSX

-#define OS_SLICE X11; Linux x86_64;

-#else

-#define OS_SLICE Macintosh; Intel Mac OS X 10.11;

-#endif

-#else

-#define OS_SLICE Windows NT 6.1; WOW64;

-#endif

+// %OS_SLICE% macro is resolved at runtime, see MoonchildProductions/UXP/issues/1473

 

 // Special-case AMO

 // We send the native UA slice now, since they no longer offer any compatible extensions for us.

 // This will result in an "only with Firefox" message which suits us fine, because it's the truth.

-pref("@GUAO_PREF@.addons.mozilla.org","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-

-// Required for domains that have proven unresponsive to requests from users

-pref("@GUAO_PREF@.live.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.msn.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.bing.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.outlook.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.web.de","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.aol.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.calendar.yahoo.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.google.com","Mozilla/5.0 (@OS_SLICE@ rv:71.0) @GK_SLICE@ Firefox/71.0 @PM_SLICE@");

-pref("@GUAO_PREF@.googlevideos.com","Mozilla/5.0 (@OS_SLICE@ rv:38.9) @GK_SLICE@ @GRE_VERSION_SLICE@ Firefox/38.9 @PM_SLICE@");

-pref("@GUAO_PREF@.gstatic.com","Mozilla/5.0 (@OS_SLICE@ rv:71.0) @GK_SLICE@ Firefox/71.0 @PM_SLICE@");

-pref("@GUAO_PREF@.yahoo.com","Mozilla/5.0 (@OS_SLICE@ rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

-pref("@GUAO_PREF@.youtube.com","Mozilla/5.0 (@OS_SLICE@ rv:60.0) @GK_SLICE@ Firefox/60.0 @PM_SLICE@");

-pref("@GUAO_PREF@.gaming.youtube.com","Mozilla/5.0 (@OS_SLICE@ rv:42.0) @GK_SLICE@ Firefox/42.0");

-pref("@GUAO_PREF@.dropbox.com","Mozilla/5.0 (@OS_SLICE@ rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

+pref("@GUAO_PREF@.addons.mozilla.org","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+

+// Required for domains that are unresponsive to requests from users (or likely to be)

+pref("@GUAO_PREF@.live.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.msn.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.bing.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.outlook.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.web.de","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.aol.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.calendar.yahoo.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.google.com","Mozilla/5.0 (%OS_SLICE% rv:71.0) @GK_SLICE@ Firefox/71.0 @PM_SLICE@");

+pref("@GUAO_PREF@.googlevideos.com","Mozilla/5.0 (%OS_SLICE% rv:38.9) @GK_SLICE@ @GRE_VERSION_SLICE@ Firefox/38.9 @PM_SLICE@");

+pref("@GUAO_PREF@.gstatic.com","Mozilla/5.0 (%OS_SLICE% rv:71.0) @GK_SLICE@ Firefox/71.0 @PM_SLICE@");

+pref("@GUAO_PREF@.yahoo.com","Mozilla/5.0 (%OS_SLICE% rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

+pref("@GUAO_PREF@.youtube.com","Mozilla/5.0 (%OS_SLICE% rv:60.0) @GK_SLICE@ Firefox/60.0 @PM_SLICE@");

+pref("@GUAO_PREF@.gaming.youtube.com","Mozilla/5.0 (%OS_SLICE% rv:42.0) @GK_SLICE@ Firefox/42.0");

+pref("@GUAO_PREF@.dropbox.com","Mozilla/5.0 (%OS_SLICE% rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

+pref("@GUAO_PREF@.patientaccess.com","Mozilla/5.0 (%OS_SLICE% rv:60.0) @GK_SLICE@ Firefox/60.0 @PM_SLICE@");

 

 pref("@GUAO_PREF@.players.brightcove.net","Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko");

 

 // The never-ending Facebook debacle...

-pref("@GUAO_PREF@.facebook.com","Mozilla/5.0 (@OS_SLICE@ rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

-pref("@GUAO_PREF@.fbcdn.net","Mozilla/5.0 (@OS_SLICE@ rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

+pref("@GUAO_PREF@.facebook.com","Mozilla/5.0 (%OS_SLICE% rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

+pref("@GUAO_PREF@.fbcdn.net","Mozilla/5.0 (%OS_SLICE% rv:99.9) @GK_SLICE@ Firefox/99.9 (Pale Moon)");

 

 

 // UA-Sniffing domains below are pending responses from their operators - temp workaround

-pref("@GUAO_PREF@.chase.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@");

+pref("@GUAO_PREF@.chase.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@");

 // For Amazon Prime videos

-pref("@GUAO_PREF@.www.amazon.com","Mozilla/5.0 (@OS_SLICE@ rv:45.9) @GK_SLICE@ Firefox/45.9 (Pale Moon)");

+pref("@GUAO_PREF@.www.amazon.com","Mozilla/5.0 (%OS_SLICE% rv:45.9) @GK_SLICE@ Firefox/45.9 (Pale Moon)");

 // Soundcloud uses Firefox-exclusive combinations of code. Never pass Firefox slice.

-pref("@GUAO_PREF@.soundcloud.com","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.soundcloud.com","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

 // Daily motion only likes strict Firefox UAs

-pref("@GUAO_PREF@.dailymotion.com","Mozilla/5.0 (@OS_SLICE@ rv:52.0) @GK_SLICE@ Firefox/52.0");

+pref("@GUAO_PREF@.dailymotion.com","Mozilla/5.0 (%OS_SLICE% rv:52.0) @GK_SLICE@ Firefox/52.0");

 

 

 // The following requires native mode. Or it blocks.. "too old firefox", breakage, etc.

-pref("@GUAO_PREF@.deviantart.com","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.deviantart.net","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.altibox.dk","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.altibox.no","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.firefox.com","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.mozilla.org","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.mozilla.com","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

-pref("@GUAO_PREF@.github.com","Mozilla/5.0 (@OS_SLICE@ rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.deviantart.com","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.deviantart.net","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.altibox.dk","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.altibox.no","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.firefox.com","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.mozilla.org","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.mozilla.com","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.github.com","Mozilla/5.0 (%OS_SLICE% rv:@GRE_VERSION@) @GRE_DATE_SLICE@ @PM_SLICE@");

 

 // UA-Sniffing domains below have indicated no interest in supporting Pale Moon (BOO!)

-pref("@GUAO_PREF@.humblebundle.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

-pref("@GUAO_PREF@.privat24.ua","Mozilla/5.0 (@OS_SLICE@ rv:38.0) @GK_SLICE@ Firefox/38.0");

-pref("@GUAO_PREF@.citi.com","Mozilla/5.0 (@OS_SLICE@ rv:57.0) @GK_SLICE@ Firefox/57.0 (Pale Moon)");

-pref("@GUAO_PREF@.netflix.com","Mozilla/5.0 (@OS_SLICE@ rv:45.9) @GK_SLICE@ Firefox/45.9");

-pref("@GUAO_PREF@.netflximg.net","Mozilla/5.0 (@OS_SLICE@ rv:45.9) @GK_SLICE@ Firefox/45.9");

+pref("@GUAO_PREF@.humblebundle.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ (Pale Moon)");

+pref("@GUAO_PREF@.privat24.ua","Mozilla/5.0 (%OS_SLICE% rv:38.0) @GK_SLICE@ Firefox/38.0");

+pref("@GUAO_PREF@.citi.com","Mozilla/5.0 (%OS_SLICE% rv:57.0) @GK_SLICE@ Firefox/57.0 (Pale Moon)");

+pref("@GUAO_PREF@.netflix.com","Mozilla/5.0 (%OS_SLICE% rv:45.9) @GK_SLICE@ Firefox/45.9");

+pref("@GUAO_PREF@.netflximg.net","Mozilla/5.0 (%OS_SLICE% rv:45.9) @GK_SLICE@ Firefox/45.9");

 

 // UA-sniffing domains that are "app/vendor-specific" and do not like Pale Moon

 pref("@GUAO_PREF@.web.whatsapp.com","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36");

 

 // The following domains do not like the Goanna slice

-pref("@GUAO_PREF@.hitbox.tv","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@");

-pref("@GUAO_PREF@.yuku.com","Mozilla/5.0 (@OS_SLICE@ rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ @PM_SLICE@");

+pref("@GUAO_PREF@.hitbox.tv","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@");

+pref("@GUAO_PREF@.yuku.com","Mozilla/5.0 (%OS_SLICE% rv:@GK_VERSION@) @GK_SLICE@ @FX_SLICE@ @PM_SLICE@");

 

 // ============================================================================

diff --git a/palemoon/branding/unstable/pref/palemoon-branding.js b/palemoon/branding/unstable/pref/palemoon-branding.js
index d005020b9..c4d1e599e 100644
--- a/palemoon/branding/unstable/pref/palemoon-branding.js
+++ b/palemoon/branding/unstable/pref/palemoon-branding.js
@@ -17,6 +17,9 @@ pref("general.useragent.updates.interval", 86400); // Once per day
 pref("general.useragent.updates.retry", 7200);     // Retry getting update every 2 hours if failed

 pref("general.useragent.updates.url", "https://dua.palemoon.org/?app=palemoon&version=%APP_VERSION%&channel=%CHANNEL%");

 

+// Geolocation

+pref("geo.wifi.uri", "https://pro.ip-api.com/json/?fields=lat,lon,status,message&key=K3TirHYiysBjnmD");

+

 // ========================= updates ========================

 #if defined(XP_WIN) || defined(XP_LINUX)

 // Enable auto-updates for this channel

diff --git a/palemoon/components/abouthome/aboutHome.css b/palemoon/components/abouthome/aboutHome.css
index 2b062e8e7..b41eab32a 100644
--- a/palemoon/components/abouthome/aboutHome.css
+++ b/palemoon/components/abouthome/aboutHome.css
@@ -63,7 +63,7 @@ a {
   display: -moz-box;
   -moz-box-align: center;
   padding-top: 2px;
-  -moz-padding-end: 8px;
+  padding-inline-end: 8px;
 }
 
 #searchLogoContainer[hidden] {
@@ -99,12 +99,12 @@ a {
 }
 
 #searchSubmit {
-  -moz-margin-start: -1px;
+  margin-inline-start: -1px;
   background: linear-gradient(hsla(0,0%,100%,.8), hsla(0,0%,100%,.1)) padding-box;
   padding: 0 9px;
   border: 1px solid;
   border-color: hsla(210,54%,20%,.15) hsla(210,54%,20%,.17) hsla(210,54%,20%,.2);
-  -moz-border-start: 1px solid transparent;
+  border-inline-start: 1px solid transparent;
   border-radius: 0 2.5px 2.5px 0;
   box-shadow: 0 0 2px hsla(0,0%,100%,.5) inset,
               0 1px 0 hsla(0,0%,100%,.2);
@@ -279,7 +279,7 @@ body[narrow] #restorePreviousSession {
   display: inline-block; /* display on same line as text label */
   vertical-align: middle;
   margin-bottom: 0;
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
 }
 
 #restorePreviousSession:-moz-dir(rtl)::before {
diff --git a/palemoon/components/nsBrowserGlue.js b/palemoon/components/nsBrowserGlue.js
index 081c26065..098dac6c2 100644
--- a/palemoon/components/nsBrowserGlue.js
+++ b/palemoon/components/nsBrowserGlue.js
@@ -238,9 +238,9 @@ BrowserGlue.prototype = {
         this._onPlacesShutdown();
         break;
       case "idle":
-        if ((this._idleService.idleTime > BOOKMARKS_BACKUP_IDLE_TIME * 1000) &&
-             this._shouldBackupBookmarks())
+        if (this._idleService.idleTime > BOOKMARKS_BACKUP_IDLE_TIME * 1000) {
           this._backupBookmarks();
+        }
         break;
       case "distribution-customization-complete":
         Services.obs.removeObserver(this, "distribution-customization-complete");
@@ -941,8 +941,7 @@ BrowserGlue.prototype = {
           Services.prefs.getBoolPref("browser.bookmarks.restore_default_bookmarks");
         if (restoreDefaultBookmarks) {
           // Ensure that we already have a bookmarks backup for today.
-          if (this._shouldBackupBookmarks())
-            yield this._backupBookmarks();
+          yield this._backupBookmarks();
           importBookmarks = true;
         }
       } catch(ex) {}
@@ -1088,22 +1087,19 @@ BrowserGlue.prototype = {
     }
 
     let waitingForBackupToComplete = true;
-    if (this._shouldBackupBookmarks()) {
-      waitingForBackupToComplete = false;
-      this._backupBookmarks().then(
-        function onSuccess() {
-          waitingForBackupToComplete = true;
-        },
-        function onFailure() {
-          Cu.reportError("Unable to backup bookmarks.");
-          waitingForBackupToComplete = true;
-        }
-      );
-    }
+    this._backupBookmarks().then(
+      function onSuccess() {
+        waitingForBackupToComplete = false;
+      },
+      function onFailure() {
+        Cu.reportError("Unable to backup bookmarks.");
+        waitingForBackupToComplete = false;
+      }
+    );
 
     // Backup bookmarks to bookmarks.html to support apps that depend
     // on the legacy format.
-    let waitingForHTMLExportToComplete = true;
+    let waitingForHTMLExportToComplete = false;
     // If this fails to get the preference value, we don't export.
     if (Services.prefs.getBoolPref("browser.bookmarks.autoExportHTML")) {
       // Exceptionally, since this is a non-default setting and HTML format is
@@ -1112,51 +1108,44 @@ BrowserGlue.prototype = {
       // spin the event loop on shutdown until we include a watchdog to prevent
       // potential hangs (bug 518683).  The asynchronous shutdown operations
       // will then be handled by a shutdown service (bug 435058).
-      waitingForHTMLExportToComplete = false;
+      waitingForHTMLExportToComplete = true;
       BookmarkHTMLUtils.exportToFile(BookmarkHTMLUtils.defaultPath).then(
         function onSuccess() {
-          waitingForHTMLExportToComplete = true;
+          waitingForHTMLExportToComplete = false;
         },
         function onFailure() {
           Cu.reportError("Unable to auto export html.");
-          waitingForHTMLExportToComplete = true;
+          waitingForHTMLExportToComplete = false;
         }
       );
     }
 
+    // The events loop should spin at least once because waitingForBackupToComplete
+    // is true before checking whether backup should be made.
     let thread = Services.tm.currentThread;
-    while (!waitingForBackupToComplete || !waitingForHTMLExportToComplete) {
+    while (waitingForBackupToComplete || waitingForHTMLExportToComplete) {
       thread.processNextEvent(true);
     }
   },
 
   /**
-   * Determine whether to backup bookmarks or not.
-   * @return true if bookmarks should be backed up, false if not.
-   */
-  _shouldBackupBookmarks: function() {
-    let lastBackupFile = PlacesBackups.getMostRecent();
-
-    // Should backup bookmarks if there are no backups or the maximum interval between
-    // backups elapsed.
-    return (!lastBackupFile ||
-            new Date() - PlacesBackups.getDateForFile(lastBackupFile) > BOOKMARKS_BACKUP_INTERVAL);
-  },
-
-  /**
    * Backup bookmarks.
    */
   _backupBookmarks: function() {
     return Task.spawn(function() {
-      // Backup bookmarks if there are no backups or the maximum interval between
-      // backups elapsed.
-      let maxBackups = BOOKMARKS_BACKUP_MAX_BACKUPS;
-      try {
-        maxBackups = Services.prefs.getIntPref("browser.bookmarks.max_backups");
-      }
-      catch(ex) { /* Use default. */ }
+      let lastBackupFile = yield PlacesBackups.getMostRecentBackup();
+      // Should backup bookmarks if there are no backups or the maximum
+      // interval between backups elapsed.
+      if (!lastBackupFile ||
+          new Date() - PlacesBackups.getDateForFile(lastBackupFile) > BOOKMARKS_BACKUP_INTERVAL) {
+        let maxBackups = BOOKMARKS_BACKUP_MAX_BACKUPS;
+        try {
+          maxBackups = Services.prefs.getIntPref("browser.bookmarks.max_backups");
+        }
+        catch(ex) { /* Use default. */ }
 
-      yield PlacesBackups.create(maxBackups); // Don't force creation.
+        yield PlacesBackups.create(maxBackups); // Don't force creation.
+      }
     });
   },
 
@@ -1198,7 +1187,7 @@ BrowserGlue.prototype = {
   },
 
   _migrateUI: function() {
-    const UI_VERSION = 22;
+    const UI_VERSION = 23;
     const BROWSER_DOCURL = "chrome://browser/content/browser.xul#";
     let currentUIVersion = 0;
     try {
@@ -1453,9 +1442,9 @@ BrowserGlue.prototype = {
       }
     }
 
-    if (currentUIVersion < 22) {
+    if (currentUIVersion < 23) {
       if (Services.prefs.prefHasUserValue("layers.acceleration.disabled")) {
-        let HWADisabled = Service.prefs.getBoolPref("layers.acceleration.disabled");
+        let HWADisabled = Services.prefs.getBoolPref("layers.acceleration.disabled");
         Services.prefs.setBoolPref("layers.acceleration.enabled", !HWADisabled);
         Services.prefs.setBoolPref("gfx.direct2d.disabled", HWADisabled);
       }
diff --git a/palemoon/components/preferences/advanced.js b/palemoon/components/preferences/advanced.js
index 7bcf2130e..59c12890a 100644
--- a/palemoon/components/preferences/advanced.js
+++ b/palemoon/components/preferences/advanced.js
@@ -159,8 +159,8 @@ var gAdvancedPane = {
   {
 #ifdef XP_WIN
     var fromPref = document.getElementById("layers.acceleration.enabled");
-    var toPref = document.getElementById("gfx.direct2d.disabled");
-    toPref.value = !fromPref.value;
+    var toPref = document.getElementById("gfx.direct2d.enabled");
+    toPref.value = fromPref.value;
 #endif
     this.updateHWADisplay();
   },
diff --git a/palemoon/components/preferences/advanced.xul b/palemoon/components/preferences/advanced.xul
index 693efc543..82db77605 100644
--- a/palemoon/components/preferences/advanced.xul
+++ b/palemoon/components/preferences/advanced.xul
@@ -35,7 +35,7 @@
                   onchange="gAdvancedPane.updateHardwareAcceleration()"/>
       <preference id="layers.acceleration.force"       name="layers.acceleration.force"       type="bool"/>
 #ifdef XP_WIN
-      <preference id="gfx.direct2d.disabled"           name="gfx.direct2d.disabled"           type="bool"   inverted="true"/>
+      <preference id="gfx.direct2d.enabled"            name="gfx.direct2d.disabled"           type="bool"   inverted="true"/>
 #endif
       <preference id="layout.spellcheckDefault"        name="layout.spellcheckDefault"        type="int"/>
 
diff --git a/palemoon/components/preferences/security.xul b/palemoon/components/preferences/security.xul
index 9aa3f7a8a..350eb0d79 100644
--- a/palemoon/components/preferences/security.xul
+++ b/palemoon/components/preferences/security.xul
@@ -46,10 +46,7 @@
       <preference id="network.stricttransportsecurity.enabled"
                   name="network.stricttransportsecurity.enabled"
                   type="bool"/>
-      <preference id="security.cert_pinning.hpkp.enabled"
-                  name="security.cert_pinning.hpkp.enabled"
-                  type="bool"/>
-      
+
       <!-- Opportunistic Encryption -->
                   
       <preference id="network.http.upgrade-insecure-requests"
@@ -147,10 +144,6 @@
                   label="&enableHSTS.label;"
                   accesskey="&enableHSTS.accesskey;"
                   preference="network.stricttransportsecurity.enabled" />
-        <checkbox id="enableHPKP"
-                  label="&enableHPKP.label;"
-                  accesskey="&enableHPKP.accesskey;"
-                  preference="security.cert_pinning.hpkp.enabled"/>
       </vbox>
     </groupbox>
     
diff --git a/palemoon/components/sessionstore/SessionStore.jsm b/palemoon/components/sessionstore/SessionStore.jsm
index dae7789f7..23fdac3f8 100644
--- a/palemoon/components/sessionstore/SessionStore.jsm
+++ b/palemoon/components/sessionstore/SessionStore.jsm
@@ -3236,19 +3236,24 @@ var SessionStoreInternal = {
         // instead of gotoIndex. See bug 597315.
         browser.webNavigation.sessionHistory.getEntryAtIndex(activeIndex, true);
         browser.webNavigation.sessionHistory.reloadCurrentEntry();
-        // If the user prefers it, bypass cache and always load from the network.
-        let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-        switch (this._cacheBehavior) {
-          case 2: // hard refresh
-            flags = Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_PROXY |
-                    Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE;
-            browser.webNavigation.reload(flags);
-            break;
-          case 1: // soft refresh
-            browser.webNavigation.reload(flags);
-            break;
-          default: // 0 or other: use cache, so do nothing.
-            break;
+        // If the user prefers it, bypass cache and always load from the network,
+        // but only if restoring on demand, to prevent request flooding (since
+        // reloading will override the max tabs to restore concurrently mechanism).
+        // See Issue #1772
+        if (restoreOnDemand) {
+          let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
+          switch (this._cacheBehavior) {
+            case 2: // hard refresh
+              flags = Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_PROXY |
+                      Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE;
+              browser.webNavigation.reload(flags);
+              break;
+            case 1: // soft refresh
+              browser.webNavigation.reload(flags);
+              break;
+            default: // 0 or other: use cache, so do nothing.
+              break;
+          }
         }
       }
       catch (ex) {
diff --git a/palemoon/config/version.txt b/palemoon/config/version.txt
index e9b856e98..136e68166 100644
--- a/palemoon/config/version.txt
+++ b/palemoon/config/version.txt
@@ -1 +1 @@
-29.0.0a2
\ No newline at end of file
+29.0.0a3
\ No newline at end of file
diff --git a/palemoon/confvars.sh b/palemoon/confvars.sh
index f2ca94662..55b0411ec 100644
--- a/palemoon/confvars.sh
+++ b/palemoon/confvars.sh
@@ -79,6 +79,11 @@ MOZ_JSDOWNLOADS=1
 # conformant implementations.
 MOZ_WEBGL_CONFORMANT=1
 
+# Platform Feature: Enable drawing in the titlebar on Windows
+if test "$OS_ARCH" = "WINNT"; then
+  MOZ_CAN_DRAW_IN_TITLEBAR=1
+fi
+
 # Set the chrome packing format
 # Possible values are omni, jar, and flat
 # Currently, only omni and flat are supported
diff --git a/palemoon/locales/en-US/chrome/browser/preferences/security.dtd b/palemoon/locales/en-US/chrome/browser/preferences/security.dtd
index 930736d56..c18ed600a 100644
--- a/palemoon/locales/en-US/chrome/browser/preferences/security.dtd
+++ b/palemoon/locales/en-US/chrome/browser/preferences/security.dtd
@@ -37,8 +37,6 @@
 <!ENTITY  SecProto.label             "Security Protocols">
 <!ENTITY  enableHSTS.label           "Enable Strict Transport Security (HSTS)">
 <!ENTITY  enableHSTS.accesskey       "S">
-<!ENTITY  enableHPKP.label           "Enable Certificate Key Pinning (HPKP)">
-<!ENTITY  enableHPKP.accesskey       "C">
 
 <!ENTITY  OpEnc.label                "Opportunistic Encryption (OE)">
 <!ENTITY  enableUIROpEnc.label       "Enable Upgrade Insecure Requests">
diff --git a/palemoon/themes/linux/aboutCertError.css b/palemoon/themes/linux/aboutCertError.css
index dbb353025..100bb3d3b 100644
--- a/palemoon/themes/linux/aboutCertError.css
+++ b/palemoon/themes/linux/aboutCertError.css
@@ -33,7 +33,7 @@ h2 {
   border-radius: 10px;
   box-shadow: 0px 0px 8px red;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   background: url("chrome://global/skin/icons/sslWarning.png") left 0 no-repeat -moz-Field;
   background-origin: content-box;
 }
@@ -43,16 +43,16 @@ h2 {
 }
 
 #errorTitle {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #errorLongContent {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 .expander > button {
-  -moz-padding-start: 20px;
-  -moz-margin-start: -20px;
+  padding-inline-start: 20px;
+  margin-inline-start: -20px;
   background: url("chrome://browser/skin/aboutCertError_sectionExpanded.png") left center no-repeat;
   border: none;
   font: inherit;
diff --git a/palemoon/themes/linux/aboutPrivateBrowsing.css b/palemoon/themes/linux/aboutPrivateBrowsing.css
index 2bb39d295..a6fd54920 100644
--- a/palemoon/themes/linux/aboutPrivateBrowsing.css
+++ b/palemoon/themes/linux/aboutPrivateBrowsing.css
@@ -21,7 +21,7 @@ body.normal > #errorPageContainer {
 }
 
 #startPrivateBrowsingDesc > button {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #footerDesc > p {
@@ -30,7 +30,7 @@ body.normal > #errorPageContainer {
 
 #moreInfo {
   font-size: 110%; /* to match the value set in chrome://global/skin/netError.css */
-  -moz-padding-start: 25px;
+  padding-inline-start: 25px;
   background: url("moz-icon://stock/gtk-dialog-info?size=menu") no-repeat top left;
 }
 
diff --git a/palemoon/themes/linux/aboutSessionRestore.css b/palemoon/themes/linux/aboutSessionRestore.css
index a32b9757a..a58c104ce 100644
--- a/palemoon/themes/linux/aboutSessionRestore.css
+++ b/palemoon/themes/linux/aboutSessionRestore.css
@@ -82,9 +82,9 @@ treechildren::-moz-tree-row(alternate, selected) {
 }
 
 #buttons {
-  -moz-margin-start: 80px; /* same as #errorLongContent in netError.css */
+  margin-inline-start: 80px; /* same as #errorLongContent in netError.css */
 }
 #buttons > button {
   margin-top: 2em;
-  -moz-margin-start: 5px;
+  margin-inline-start: 5px;
 }
diff --git a/palemoon/themes/linux/aboutSyncTabs.css b/palemoon/themes/linux/aboutSyncTabs.css
index 4f21a9d40..1fcd8304f 100644
--- a/palemoon/themes/linux/aboutSyncTabs.css
+++ b/palemoon/themes/linux/aboutSyncTabs.css
@@ -22,18 +22,18 @@
   margin-top: 4px;
   width: 45em;
   height: 32px;
-  -moz-margin-start: 2em;
-  -moz-margin-end: 2em;
+  margin-inline-start: 2em;
+  margin-inline-end: 2em;
 }
 
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;
-  -moz-margin-start: 40px;
+  margin-inline-start: 40px;
 }
 
 richlistitem {
-  -moz-margin-end: 2em;
+  margin-inline-end: 2em;
 }
 
 richlistitem[selected="true"],
@@ -46,7 +46,7 @@ richlistitem[type="tab"] {
   border: #999999 1px solid !important;
   padding: 2px 5px;
   margin-bottom: 4px;
-  -moz-margin-start: 4em;
+  margin-inline-start: 4em;
   border-radius: 6px;
   background-color: menu;
   width: 44em;
@@ -64,7 +64,7 @@ richlistitem[type="tab"][selected="true"] {
 richlistitem[type="client"] {
   min-height: 2em;
   color: #000000;
-  -moz-margin-start: 2em;
+  margin-inline-start: 2em;
   margin-top: 2px;
   margin-bottom: 3px;
   width: 42em;
@@ -96,6 +96,6 @@ richlistitem.desktop[type="client"] {
 }
 
 .tabIcon {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
   padding-top: 2px;
 }
diff --git a/palemoon/themes/linux/autocomplete.css b/palemoon/themes/linux/autocomplete.css
index ab926851d..e23e6b001 100644
--- a/palemoon/themes/linux/autocomplete.css
+++ b/palemoon/themes/linux/autocomplete.css
@@ -83,7 +83,7 @@ panel[type="private-autocomplete-richlistbox"],
 }
 
 .private-autocomplete-treebody::-moz-tree-cell-text {
-  -moz-padding-start: 8px;
+  padding-inline-start: 8px;
 }
 
 treechildren.private-autocomplete-treebody::-moz-tree-row(selected) {
@@ -143,15 +143,15 @@ treechildren.private-autocomplete-treebody::-moz-tree-cell-text(selected) {
   width: 16px; 
   height: 16px;
   margin-bottom: -2px;
-  -moz-margin-start: 3px;
-  -moz-margin-end: 6px;
+  margin-inline-start: 3px;
+  margin-inline-end: 6px;
 }
 
 .ac-type-icon {
   width: 16px; 
   height: 16px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 6px;
+  margin-inline-end: 4px;
 }
 
 .ac-extra > .ac-result-type-tag {
diff --git a/palemoon/themes/linux/browser.css b/palemoon/themes/linux/browser.css
index d7344a234..805c22d67 100644
--- a/palemoon/themes/linux/browser.css
+++ b/palemoon/themes/linux/browser.css
@@ -92,8 +92,8 @@ toolbarbutton.bookmark-item:hover:active,
 toolbarbutton.bookmark-item[open="true"] {
   padding-top: 3px;
   padding-bottom: 1px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
 }
 
 .bookmark-item > .toolbarbutton-icon {
@@ -137,7 +137,7 @@ menuitem.bookmark-item {
 }
 
 .bookmark-item > .menu-iconic-left > .menu-iconic-icon {
-  -moz-padding-start: 0px;
+  padding-inline-start: 0px;
 }
 
 /* Bookmark drag and drop styles */
@@ -157,7 +157,7 @@ menuitem.bookmark-item {
 .menupopup-drop-indicator {
   list-style-image: none;
   height: 2px;
-  -moz-margin-end: -4em;
+  margin-inline-end: -4em;
   background-color: Highlight;
 }
 
@@ -559,7 +559,7 @@ menuitem:not([type]):not(.menuitem-tooltip):not(.menuitem-iconic-tooltip) {
 }
 
 .toolbarbutton-1 > .toolbarbutton-icon {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 toolbar[mode="full"] .toolbarbutton-1:not([type="menu-button"]),
@@ -897,7 +897,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
 /* Fullscreen window controls */
 #window-controls {
   -moz-box-align: start;
-  -moz-margin-start: 10px;
+  margin-inline-start: 10px;
 }
 
 #minimize-button {
@@ -923,7 +923,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
 }
 
 .urlbar-input-box {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
   min-width: 4em;
 }
 
@@ -948,25 +948,25 @@ toolbar[iconsize="small"] #webrtc-status-button {
 #urlbar-search-splitter {
   -moz-appearance: none;
   width: 8px;
-  -moz-margin-start: -4px;
+  margin-inline-start: -4px;
 }
 
 #urlbar-search-splitter + #urlbar-container > #urlbar ,
 #urlbar-search-splitter + #search-container > #searchbar > .searchbar-textbox {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #urlbar-display-box {
   margin-top: -1px;
   margin-bottom: -1px;
-  -moz-border-end: 1px solid #AAA;
-  -moz-margin-end: 3px;
+  border-inline-end: 1px solid #AAA;
+  margin-inline-end: 3px;
 }
 
 #urlbar-display {
   margin-top: 0;
   margin-bottom: 0;
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
   color: GrayText;
 }
 
@@ -976,8 +976,8 @@ toolbar[iconsize="small"] #webrtc-status-button {
   height: 16px;
   margin-top: 2px;
   margin-bottom: 2px;
-  -moz-margin-start: 4px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 4px;
+  margin-inline-end: 3px;
   list-style-image: url(chrome://browser/skin/identity-icons-generic.png);
   -moz-image-region: rect(0, 16px, 16px, 0);
 }
@@ -1013,7 +1013,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
 #identity-box {
   padding: 1px;
   margin: -1px;
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
   font-size: .9em;
 }
 
@@ -1033,13 +1033,13 @@ toolbar[iconsize="small"] #webrtc-status-button {
 }
 
 #identity-icon-labels {
-  -moz-padding-start: 2px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 2px;
+  padding-inline-end: 5px;
 }
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedIdentity {
   color: rgb(95,127,67);
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   background-image: linear-gradient(rgba(226,246,208,1),
                                     rgba(203,235,177,1));
   background-position: right;
@@ -1048,7 +1048,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedDomain {
   color: rgb(51,87,137);
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   background-image: linear-gradient(rgba(220,231,245,1),
                                     rgba(207,221,242,1));
   background-position: right;
@@ -1109,13 +1109,13 @@ toolbar[iconsize="small"] #webrtc-status-button {
 /* Identity popup body text */
 .identity-popup-description {
   white-space: pre-wrap;
-  -moz-padding-start: 15px;
+  padding-inline-start: 15px;
   margin: 2px 0 4px;
 }
 
 .identity-popup-label {
   white-space: pre-wrap;
-  -moz-padding-start: 15px;
+  padding-inline-start: 15px;
   margin: 0;
 }
 
@@ -1141,7 +1141,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption ,
 #identity-popup-content-box.verifiedDomain > #identity-popup-encryption {
   margin-top: 10px;
-  -moz-margin-start: -18px;
+  margin-inline-start: -18px;
 }
 
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption > vbox > #identity-popup-encryption-icon ,
@@ -1162,7 +1162,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
 .popup-notification-icon {
   width: 64px;
   height: 64px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .popup-notification-icon[popupid="geolocation"] {
@@ -1200,8 +1200,8 @@ toolbar[iconsize="small"] #webrtc-status-button {
 
 .popup-progress-label,
 .popup-progress-meter {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 .popup-progress-cancel {
@@ -1210,7 +1210,7 @@ toolbar[iconsize="small"] #webrtc-status-button {
   border: none;
   padding: 0;
   margin: 0;
-  -moz-margin-start: 5px;
+  margin-inline-start: 5px;
   min-height: 0;
   min-width: 0;
   list-style-image: url("moz-icon://stock/gtk-cancel?size=menu");
@@ -1252,13 +1252,13 @@ toolbar[iconsize="small"] #webrtc-status-button {
   border-width: 0 8px 0 0;
   border-style: solid;
   border-image: url("chrome://browser/skin/urlbar-arrow.png") 0 8 0 0 fill;
-  -moz-margin-end: -8px;
+  margin-inline-end: -8px;
   margin-top: -1px;
   margin-bottom: -1px;
 }
 
 #notification-popup-box:not([hidden]) + #identity-box {
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
   border-radius: 0;
 }
 
@@ -1710,7 +1710,7 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 .tab-icon-image {
   width: 16px;
   height: 16px;
-  -moz-margin-end: 3px;
+  margin-inline-end: 3px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
@@ -1725,8 +1725,8 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 .tab-throbber[pinned],
 .tab-icon-image[pinned],
 .tabs-newtab-button > .toolbarbutton-icon {
-  -moz-margin-start: 2px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 2px;
+  margin-inline-end: 2px;
 }
 
 #context_reloadTab {
@@ -1766,12 +1766,12 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   padding: 0;
   margin-top: -1px;
   margin-bottom: -1px;
-  -moz-margin-end: -1px;
+  margin-inline-end: -1px;
 }
 
 /* Tab sound indicator */
 .tab-icon-sound {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   width: 16px;
   height: 16px;
   padding: 0;
@@ -1876,13 +1876,13 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up {
-  -moz-border-start: 0;
-  -moz-border-end: 2px solid transparent;
+  border-inline-start: 0;
+  border-inline-end: 2px solid transparent;
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-down {
-  -moz-border-start: 2px solid transparent;
-  -moz-border-end: 0;
+  border-inline-start: 2px solid transparent;
+  border-inline-end: 0;
   transition: 1s box-shadow ease-out;
   border-radius: 4px;
 }
@@ -1952,7 +1952,7 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 
 #sidebar-throbber[loading="true"] {
   list-style-image: url("chrome://global/skin/icons/loading_16.png");
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
 }
 
 toolbarbutton.chevron {
@@ -2040,8 +2040,8 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 }
 
 #allTabs-filter {
-  -moz-margin-start: 36px;
-  -moz-margin-end: 0;
+  margin-inline-start: 36px;
+  margin-inline-end: 0;
 }
 
 .allTabs-preview-label {
@@ -2051,7 +2051,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 /* Application button menu */
 
 .splitmenu-menuitem {
-  -moz-margin-end: 1px;
+  margin-inline-end: 1px;
 }
 
 #appmenu-toolbar-button:not(:hover):not([open]):not(:-moz-lwtheme) {
@@ -2064,7 +2064,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
   margin-bottom: -2px !important;
 }
 #appmenuSecondaryPane {
-  -moz-border-start: 1px solid ThreeDShadow;
+  border-inline-start: 1px solid ThreeDShadow;
 }
 #appmenuSecondaryPane-spacer {
   min-height: 1em;
@@ -2184,7 +2184,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
   text-shadow: none;
   background-image: linear-gradient(#B4211B, #8A1915);
   border-radius: 1px;
-  -moz-margin-end: 2px;
+  margin-inline-end: 2px;
 }
 %endif
 
diff --git a/palemoon/themes/linux/downloads/allDownloadsViewOverlay.css b/palemoon/themes/linux/downloads/allDownloadsViewOverlay.css
index 3526e01d6..b41788472 100644
--- a/palemoon/themes/linux/downloads/allDownloadsViewOverlay.css
+++ b/palemoon/themes/linux/downloads/allDownloadsViewOverlay.css
@@ -14,7 +14,7 @@
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
   /* Prevent flickering when changing states. */
   min-height: 32px;
   min-width: 32px;
diff --git a/palemoon/themes/linux/downloads/downloads.css b/palemoon/themes/linux/downloads/downloads.css
index 79bb5ee57..368abd677 100644
--- a/palemoon/themes/linux/downloads/downloads.css
+++ b/palemoon/themes/linux/downloads/downloads.css
@@ -51,7 +51,7 @@
 #downloadsSummary,
 richlistitem[type="download"] {
   height: 6em;
-  -moz-padding-end: 0;
+  padding-inline-end: 0;
   color: inherit;
 }
 
@@ -96,7 +96,7 @@ richlistitem[type="download"]:last-child {
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
   /* Prevent flickering when changing states. */
   min-height: 32px;
   min-width: 32px;
@@ -358,7 +358,7 @@ toolbar[brighttext] #downloads-indicator-counter {
   background-image: linear-gradient(#505050, #575757);
   border: 1px solid;
   border-color: hsla(0,0%,0%,.6) hsla(0,0%,0%,.4) hsla(0,0%,0%,.4);
-  -moz-border-start: none;
+  border-inline-start: none;
   border-radius: 0 2px 2px 0;
 }
 
diff --git a/palemoon/themes/linux/engineManager.css b/palemoon/themes/linux/engineManager.css
index 18817cd4f..c6d42cce2 100644
--- a/palemoon/themes/linux/engineManager.css
+++ b/palemoon/themes/linux/engineManager.css
@@ -5,8 +5,8 @@
 %endif
 
 #engineList treechildren::-moz-tree-image(engineName) {
-  -moz-margin-end: 4px;
-  -moz-margin-start: 1px;
+  margin-inline-end: 4px;
+  margin-inline-start: 1px;
   width: 16px;
   height: 16px;
 }
diff --git a/palemoon/themes/linux/feeds/subscribe-ui.css b/palemoon/themes/linux/feeds/subscribe-ui.css
index b3c0b37a2..51eb7a117 100644
--- a/palemoon/themes/linux/feeds/subscribe-ui.css
+++ b/palemoon/themes/linux/feeds/subscribe-ui.css
@@ -7,17 +7,17 @@
 }
 
 .handlersMenuPopup > menuitem {
-  -moz-padding-start: 23px;
+  padding-inline-start: 23px;
 }
 
 .handlersMenuPopup > menuitem.menuitem-iconic {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 .handlersMenuPopup > .menuitem-iconic  > .menu-iconic-left {
   display: -moz-box;
   min-width: 16px;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 .chooseApplicationMenuItem {
diff --git a/palemoon/themes/linux/feeds/subscribe.css b/palemoon/themes/linux/feeds/subscribe.css
index dd1e24eef..ac5de5865 100644
--- a/palemoon/themes/linux/feeds/subscribe.css
+++ b/palemoon/themes/linux/feeds/subscribe.css
@@ -10,7 +10,7 @@ html {
 #feedBody {
   border: 1px solid THreeDShadow;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   margin: 2em auto;
   background: -moz-Field;
 }
@@ -25,9 +25,9 @@ html {
 #feedHeader {  
   margin-top: 4.9em;
   margin-bottom: 1em;
-  -moz-margin-start: 1.4em;
-  -moz-margin-end: 1em;
-  -moz-padding-start: 2.9em;
+  margin-inline-start: 1.4em;
+  margin-inline-end: 1em;
+  padding-inline-start: 2.9em;
   font-size: 110%;
   color: InfoText;
 }
@@ -54,12 +54,12 @@ html {
 
 #feedHeader[firstrun="true"] #feedIntroText {
   padding-top: 0.1em;
-  -moz-padding-start: 0.6em;
+  padding-inline-start: 0.6em;
   display: block;
 }
 
 #feedHeader[firstrun="true"] > #feedSubscribeLine {
-  -moz-padding-start: 1.8em;
+  padding-inline-start: 1.8em;
 }
 
 #feedSubscribeLine {
@@ -99,8 +99,8 @@ h2 {
 
 #feedTitleLink {
   float: right;
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
 }
@@ -110,15 +110,15 @@ a[href] img {
 }
 
 #feedTitleContainer {
-  -moz-margin-start: 0;
-  -moz-margin-end: .6em;
+  margin-inline-start: 0;
+  margin-inline-end: .6em;
   margin-top: 0;
   margin-bottom: 0;
 }
 
 #feedTitleImage {
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
   max-width: 300px;
diff --git a/palemoon/themes/linux/pageInfo.css b/palemoon/themes/linux/pageInfo.css
index 49ae4938a..805c2fa45 100644
--- a/palemoon/themes/linux/pageInfo.css
+++ b/palemoon/themes/linux/pageInfo.css
@@ -75,7 +75,7 @@ textbox {
 }
 
 textbox.header {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 .iframe {
@@ -94,7 +94,7 @@ textbox[disabled] {
 
 /* General Tab */
 #generalPanel > #titletext {
-  -moz-margin-start: 5px;
+  margin-inline-start: 5px;
 }
 
 groupbox.collapsable caption .caption-icon { 
@@ -102,8 +102,8 @@ groupbox.collapsable caption .caption-icon {
   height: 9px;
   background-repeat: no-repeat;
   background-position: center;
-  -moz-margin-start: 1px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 1px;
+  margin-inline-end: 3px;
   background-image: url("chrome://global/skin/tree/twisty-open.png");
 }
 
@@ -121,13 +121,13 @@ groupbox tree {
 }
 
 groupbox.treebox .groupbox-body { 
-  -moz-margin-start: 5px;
-  -moz-margin-end: 1px;
+  margin-inline-start: 5px;
+  margin-inline-end: 1px;
   padding-top: 0;
 }
 
 #securityBox description { 
-  -moz-margin-start: 10px;
+  margin-inline-start: 10px;
 }
 
 #general-security-identity {
@@ -182,8 +182,8 @@ treechildren::-moz-tree-cell-text(broken) {
 #feedListbox richlistitem {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
   color: -moz-FieldText;
@@ -229,8 +229,8 @@ treechildren::-moz-tree-cell-text(broken) {
 .permission {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
diff --git a/palemoon/themes/linux/permissions/aboutPermissions.css b/palemoon/themes/linux/permissions/aboutPermissions.css
index 386e167e6..17634e8fa 100644
--- a/palemoon/themes/linux/permissions/aboutPermissions.css
+++ b/palemoon/themes/linux/permissions/aboutPermissions.css
@@ -40,7 +40,7 @@
 .site-favicon {
   height: 16px;
   width: 16px;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
@@ -57,7 +57,7 @@
 
 #site-description {
   font-size: 125%;
-  -moz-margin-start: 6px; /* to match button margin */
+  margin-inline-start: 6px; /* to match button margin */
 }
 
 #site-label {
@@ -69,7 +69,7 @@
 #defaults-description {
   font-size: 125%;
   font-weight: bold;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 .pref-item {
@@ -79,7 +79,7 @@
 .pref-icon {
   width: 36px;
   height: 36px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .pref-icon[type="password"] {
diff --git a/palemoon/themes/linux/places/editBookmarkOverlay.css b/palemoon/themes/linux/places/editBookmarkOverlay.css
index f1f6210b4..dba6ba655 100644
--- a/palemoon/themes/linux/places/editBookmarkOverlay.css
+++ b/palemoon/themes/linux/places/editBookmarkOverlay.css
@@ -24,7 +24,7 @@
 .expander-down {
   min-width: 0;
   padding: 2px 0;
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 .expander-up > .button-box {
diff --git a/palemoon/themes/linux/places/organizer.css b/palemoon/themes/linux/places/organizer.css
index cabeebbca..16ead7212 100644
--- a/palemoon/themes/linux/places/organizer.css
+++ b/palemoon/themes/linux/places/organizer.css
@@ -47,7 +47,7 @@
 }
 
 #placesMenu > menu {
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
   -moz-binding: url("chrome://browser/skin/places/organizer.xml#toolbarbutton-dropdown");
   -moz-appearance: toolbarbutton;
   color: -moz-DialogText;
@@ -74,7 +74,7 @@
 }
 
 #infoBoxExpanderLabel {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 #searchModifiers {
diff --git a/palemoon/themes/linux/preferences/applications.css b/palemoon/themes/linux/preferences/applications.css
index c9d1b8c8a..8b63dfdab 100644
--- a/palemoon/themes/linux/preferences/applications.css
+++ b/palemoon/themes/linux/preferences/applications.css
@@ -11,18 +11,18 @@
 .actionsMenu {
   margin-top: -1px;
   margin-bottom: -1px;
-  -moz-margin-start: -1px;
-  -moz-margin-end: 0;
+  margin-inline-start: -1px;
+  margin-inline-end: 0;
 }
 
 .typeIcon,
 .actionIcon {
-  -moz-margin-start: 3px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 3px;
+  margin-inline-end: 3px;
 }
 
 richlistitem label {
-  -moz-margin-start: 1px;
+  margin-inline-start: 1px;
   margin-top: 2px;
 }
 
@@ -51,16 +51,16 @@ menuitem[appHandlerIcon="plugin"] {
 }
 
 .actionsMenu .menulist-icon {
-  -moz-margin-end: 1px;
+  margin-inline-end: 1px;
   height: 16px;
   width: 16px;
 }
 
 .actionsMenu > menupopup > menuitem > .menu-iconic-left {
-  -moz-padding-start: 0;
-  -moz-padding-end: 4px !important;
+  padding-inline-start: 0;
+  padding-inline-end: 4px !important;
 }
 
 .actionsMenu > menupopup > menuitem {
-  -moz-padding-start: 3px;
+  padding-inline-start: 3px;
 }
diff --git a/palemoon/themes/linux/sanitizeDialog.css b/palemoon/themes/linux/sanitizeDialog.css
index 96cf3bcea..28d4e7eb3 100644
--- a/palemoon/themes/linux/sanitizeDialog.css
+++ b/palemoon/themes/linux/sanitizeDialog.css
@@ -3,12 +3,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #sanitizeDurationChoice {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 /* Align the duration label with the warning box and item list */
 #sanitizeDurationLabel {
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
 }
 
 
@@ -56,15 +56,15 @@
   padding: 0;
   margin-top: 6px;
   margin-bottom: 6px;
-  -moz-margin-start: -6px;
-  -moz-margin-end: 0;
+  margin-inline-start: -6px;
+  margin-inline-end: 0;
 }
 
 .expander-up,
 .expander-down {
   min-width: 0;
   padding: 2px 0;
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 .expander-up {
@@ -86,8 +86,8 @@
 
 /* Make the item list the same width as the warning box */
 #itemList {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 /* Without this a useless scrollbar appears in the listbox when its rows
@@ -100,8 +100,8 @@
 
 /* Align the last dialog button with the end of the warning box */
 .prefWindow-dlgbuttons {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 .dialog-button[dlgtype="accept"] {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
diff --git a/palemoon/themes/linux/searchbar.css b/palemoon/themes/linux/searchbar.css
index cb6ecffcc..0352e27a7 100644
--- a/palemoon/themes/linux/searchbar.css
+++ b/palemoon/themes/linux/searchbar.css
@@ -26,7 +26,7 @@
   height: 16px;
   width: 16px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
-  -moz-margin-start: 2px;
+  margin-inline-start: 2px;
 }
 
 .searchbar-engine-button {
@@ -41,7 +41,7 @@
 .searchbar-engine-button > .button-box {
   -moz-appearance: none;
   padding: 2px 0;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
   border: 0;
 }
 
diff --git a/palemoon/themes/linux/statusbar/overlay.css b/palemoon/themes/linux/statusbar/overlay.css
index 2351aac4c..d326bac3f 100644
--- a/palemoon/themes/linux/statusbar/overlay.css
+++ b/palemoon/themes/linux/statusbar/overlay.css
@@ -57,7 +57,7 @@ toolbar[mode="icons"] #status4evar-download-button[forcelabel="true"] > label
 {
 	margin: 0px 2px !important;
 	margin-top: -1px !important;
-	-moz-margin-start: 4px !important;
+	margin-inline-start: 4px !important;
 }
 
 /*
@@ -81,7 +81,7 @@ splitter.status4evar-status-splitter
 
 #notification-popup-box
 {
-	-moz-margin-start: -1px;
+	margin-inline-start: -1px;
 }
 
 #urlbar .urlbar-over-link-box
diff --git a/palemoon/themes/linux/syncCommon.css b/palemoon/themes/linux/syncCommon.css
index 9a84cebee..9ad7214aa 100644
--- a/palemoon/themes/linux/syncCommon.css
+++ b/palemoon/themes/linux/syncCommon.css
@@ -8,7 +8,7 @@
 }
 
 .statusIcon {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   max-height: 16px;
   max-width: 16px;
 }
diff --git a/palemoon/themes/linux/syncSetup.css b/palemoon/themes/linux/syncSetup.css
index 4c6518a1b..f84fd08ad 100644
--- a/palemoon/themes/linux/syncSetup.css
+++ b/palemoon/themes/linux/syncSetup.css
@@ -99,7 +99,7 @@ description > .text-link:focus {
 }
 
 .inputColumn {
-  -moz-margin-end: 2px
+  margin-inline-end: 2px
 }
 
 .pin {
diff --git a/palemoon/themes/osx/Search-glass.png b/palemoon/themes/osx/Search-glass.png
deleted file mode 100644
index 9eb0e259f..000000000
--- a/palemoon/themes/osx/Search-glass.png
+++ /dev/null
diff --git a/palemoon/themes/osx/Search.png b/palemoon/themes/osx/Search.png
new file mode 100644
index 000000000..0b71db3b4
--- /dev/null
+++ b/palemoon/themes/osx/Search.png
diff --git a/palemoon/themes/osx/Toolbar-glass.png b/palemoon/themes/osx/Toolbar-glass.png
deleted file mode 100644
index 23cc4bfaf..000000000
--- a/palemoon/themes/osx/Toolbar-glass.png
+++ /dev/null
diff --git a/palemoon/themes/osx/Toolbar-inverted.png b/palemoon/themes/osx/Toolbar-inverted.png
index 2c3253fe8..54d83bf5f 100644
--- a/palemoon/themes/osx/Toolbar-inverted.png
+++ b/palemoon/themes/osx/Toolbar-inverted.png
diff --git a/palemoon/themes/osx/Toolbar-inverted.svg b/palemoon/themes/osx/Toolbar-inverted.svg
new file mode 100644
index 000000000..ce59313e6
--- /dev/null
+++ b/palemoon/themes/osx/Toolbar-inverted.svg
@@ -0,0 +1,302 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   enable-background="new 0 0 378 38"
+   viewBox="0 0 378 38"
+   height="38"
+   width="378"
+   y="0px"
+   x="0px"
+   id="strataToolbarSVG"
+   version="1.1">
+  <metadata
+     id="metadata146">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs144">
+    <filter
+       id="filter1070"
+       style="color-interpolation-filters:sRGB;">
+      <feFlood
+         id="feFlood1060"
+         result="flood"
+         flood-color="rgb(0,0,0)"
+         flood-opacity="0.498039" />
+      <feComposite
+         id="feComposite1062"
+         result="composite1"
+         operator="in"
+         in2="SourceGraphic"
+         in="flood" />
+      <feGaussianBlur
+         id="feGaussianBlur1064"
+         result="blur"
+         stdDeviation="0.5"
+         in="composite1" />
+      <feOffset
+         id="feOffset1066"
+         result="offset"
+         dy="0"
+         dx="0" />
+      <feComposite
+         id="feComposite1068"
+         result="fbSourceGraphic"
+         operator="over"
+         in2="offset"
+         in="SourceGraphic" />
+      <feColorMatrix
+         id="feColorMatrix1072"
+         values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"
+         in="fbSourceGraphic"
+         result="fbSourceGraphicAlpha" />
+      <feFlood
+         in="fbSourceGraphic"
+         result="flood"
+         flood-color="rgb(0,0,0)"
+         flood-opacity="0.498039"
+         id="feFlood1074" />
+      <feComposite
+         result="composite1"
+         operator="in"
+         in="flood"
+         id="feComposite1076"
+         in2="fbSourceGraphic" />
+      <feGaussianBlur
+         result="blur"
+         stdDeviation="0.5"
+         in="composite1"
+         id="feGaussianBlur1078" />
+      <feOffset
+         result="offset"
+         dy="0"
+         dx="0"
+         id="feOffset1080" />
+      <feComposite
+         result="fbSourceGraphic"
+         operator="over"
+         in="fbSourceGraphic"
+         id="feComposite1082"
+         in2="offset" />
+      <feColorMatrix
+         id="feColorMatrix1084"
+         values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"
+         in="fbSourceGraphic"
+         result="fbSourceGraphicAlpha" />
+      <feFlood
+         in="fbSourceGraphic"
+         result="flood"
+         flood-color="rgb(0,0,0)"
+         flood-opacity="0.498039"
+         id="feFlood1086" />
+      <feComposite
+         result="composite1"
+         operator="in"
+         in="flood"
+         id="feComposite1088"
+         in2="fbSourceGraphic" />
+      <feGaussianBlur
+         result="blur"
+         stdDeviation="0.5"
+         in="composite1"
+         id="feGaussianBlur1090" />
+      <feOffset
+         result="offset"
+         dy="0"
+         dx="0"
+         id="feOffset1092" />
+      <feComposite
+         result="fbSourceGraphic"
+         operator="over"
+         in="fbSourceGraphic"
+         id="feComposite1094"
+         in2="offset" />
+      <feColorMatrix
+         id="feColorMatrix1096"
+         values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"
+         in="fbSourceGraphic"
+         result="fbSourceGraphicAlpha" />
+      <feFlood
+         in="fbSourceGraphic"
+         result="flood"
+         flood-color="rgb(0,0,0)"
+         flood-opacity="0.498039"
+         id="feFlood1098" />
+      <feComposite
+         result="composite1"
+         operator="in"
+         in="flood"
+         id="feComposite1100"
+         in2="fbSourceGraphic" />
+      <feGaussianBlur
+         result="blur"
+         stdDeviation="0.5"
+         in="composite1"
+         id="feGaussianBlur1102" />
+      <feOffset
+         result="offset"
+         dy="0"
+         dx="0"
+         id="feOffset1104" />
+      <feComposite
+         result="fbSourceGraphic"
+         operator="over"
+         in="fbSourceGraphic"
+         id="feComposite1106"
+         in2="offset" />
+      <feColorMatrix
+         id="feColorMatrix1108"
+         values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"
+         in="fbSourceGraphic"
+         result="fbSourceGraphicAlpha" />
+      <feFlood
+         in="fbSourceGraphic"
+         result="flood"
+         flood-color="rgb(0,0,0)"
+         flood-opacity="0.498039"
+         id="feFlood1110" />
+      <feComposite
+         result="composite1"
+         operator="in"
+         in="flood"
+         id="feComposite1112"
+         in2="fbSourceGraphic" />
+      <feGaussianBlur
+         result="blur"
+         stdDeviation="0.5"
+         in="composite1"
+         id="feGaussianBlur1114" />
+      <feOffset
+         result="offset"
+         dy="0"
+         dx="0"
+         id="feOffset1116" />
+      <feComposite
+         result="composite2"
+         operator="over"
+         in="fbSourceGraphic"
+         id="feComposite1118"
+         in2="offset" />
+    </filter>
+  </defs>
+  <g
+     style="fill:#ffffff;filter:url(#filter1070)"
+     id="toolbar">
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 14.7,10.7 C 14.464283,10.935746 14.000125,11 14.000125,11 H 9 l 2.132,2.085573 c 0.519423,0.508112 0.595,1.2729 0.198,1.6979 l -0.793,0.9549 c -0.396,0.424 -1.091,0.318 -1.587,-0.212 L 3.595,9.690773 3,8.946873 l 0.595,-0.743 5.256,-5.7295 c 0.496,-0.531 1.19,-0.637 1.587,-0.212 l 0.794,0.9549 c 0.396,0.425 0.297,1.1669 -0.198,1.6979 L 9,7 h 4.999875 c 0,0 0.464437,0.064342 0.700125,0.3 0.235717,0.2356875 0.299875,0.7 0.299875,0.7 l 2.5e-4,2 c 0,0 -0.06444,0.464283 -0.300125,0.7 z"
+       id="back" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="back-large"
+       d="m 16.441631,29.733331 c -0.275,0.275034 -0.816512,0.349996 -0.816512,0.349996 H 8.999927 l 2.487308,2.516543 c 0.595913,0.602917 0.694159,1.485034 0.230997,1.980862 l -0.925157,1.114039 C 10.33108,36.189432 9.5202547,36.065767 8.9415947,35.44744 L 2.6941594,28.639311 2,27.771437 2.6941594,26.904612 8.8260957,20.220265 c 0.57866,-0.619493 1.3883193,-0.743159 1.8514803,-0.24733 l 0.926324,1.114038 c 0.461995,0.495828 0.346497,1.361369 -0.230997,1.980863 l -2.37283,2.348836 h 6.6249 c 0,0 0.541837,0.07506 0.816804,0.349997 0.275,0.274966 0.34985,0.816658 0.34985,0.816658 l 1.46e-4,2.333346 c 0,0 -0.07518,0.541658 -0.350142,0.816658 z" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="forward"
+       d="m 21.30025,10.7 c 0.235717,0.235746 0.699875,0.3 0.699875,0.3 h 5.000125 l -2.132,2.085573 c -0.519423,0.508112 -0.595,1.2729 -0.198,1.6979 l 0.793,0.9549 c 0.396,0.424 1.091,0.318 1.587,-0.212 l 5.355,-5.8356 0.595,-0.7439 -0.595,-0.743 -5.256,-5.7295 c -0.496,-0.531 -1.19,-0.637 -1.587,-0.212 l -0.794,0.9549 c -0.396,0.425 -0.297,1.1669 0.198,1.6979 L 27.00025,7 h -4.999875 c 0,0 -0.464437,0.064342 -0.700125,0.3 C 21.064533,7.5356875 21.000375,8 21.000375,8 l -2.5e-4,2 c 0,0 0.06444,0.464283 0.300125,0.7 z" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 51.5,4.64955 47.233834,8.949625 51.5,13.248616 49.366916,15.398166 45,11.201008 40.733834,15.5 38.60075,13.35045 42.866916,8.9485416 38.5,4.64955 40.633084,2.5 45,6.800075 49.266166,2.5 Z"
+       id="stop" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 69,9 H 62 L 64.8,6.2 C 64.1,5.7 63.4,5.5 62.5,5.5 c -2.2,0 -4,1.8 -4,4 0,2.2 1.8,4 4,4 1.399,0 2.7,-0.7 3.399,-1.9 l 2.301,1 C 67.099,14.6 65,16 62.5,16 58.899,16 56,13.1 56,9.5 56,5.9 58.899,3 62.5,3 64,3 65.399,3.5 66.6,4.4 L 69,2 Z"
+       id="reload" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 76,9 h -3 l 8,-7 8,7 h -3 v 6.5 H 82 V 12 h -2 v 3.5 h -4 z"
+       id="home" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 91.5,9 h 4.453 V 2 h 6.093 V 9 H 106.5 L 99,16 Z"
+       id="download" />
+    <path
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 117,2 c -3.866,0 -7,3.134 -7,7 0,3.866 3.134,7 7,7 3.866,0 7,-3.134 7,-7 0,-3.866 -3.134,-7 -7,-7 z m 0,2 c 2.761,0 5,2.238 5,5 0,2.762 -2.239,5 -5,5 -2.762,0 -5,-2.238 -5,-5 0,-2.762 2.239,-5 5,-5 z m -0.7,1.2 C 116.0643,5.4357023 116,6 116,6 v 4 l 4,2 -2,-3 V 6 C 118,6 117.9357,5.4357023 117.7,5.2 117.4643,4.9642977 117,5 117,5 c 0,0 -0.4643,-0.035702 -0.7,0.2 z"
+       id="history" />
+    <g
+       style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="bookmarks">
+      <path
+         style="stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         d="m 131,2 v 14 h 7.44922 0.55078 1.94922 c 0.99175,-0.258441 1.76717,-1.038297 2,-2 V 12 6 4 c -0.23283,-0.9617034 -1.00825,-1.7415586 -2,-2 h -1.63672 -0.86328 z m 6.11523,2.4160156 1.05469,1.7714844 c 0,0 0.29209,0.4878333 0.51953,0.6425781 0.21313,0.1449479 0.73828,0.2285157 0.73828,0.2285157 h 2.15625 l -1.49804,2.4335937 c 0,0 -0.21789,0.4778906 -0.32617,0.7167965 -0.16271,0.357558 0.005,0.982547 0.0586,1.566407 0.0848,0.918442 0.15039,1.80664 0.15039,1.80664 l -1.75,-0.894531 c 0,0 -0.71714,-0.337318 -1.10156,-0.337891 -0.45203,0 -1.29883,0.392579 -1.29883,0.392579 l -1.75391,0.841796 c 0,0 0.12894,-0.80101 0.26758,-1.68164 0.0917,-0.579219 0.34458,-1.238485 0.14063,-1.636719 -0.11058,-0.216562 -0.33204,-0.6484375 -0.33204,-0.6484375 l -1.7246,-2.5019531 h 2.14257 c 0,0 0.69711,-0.049193 0.98243,-0.2285156 0.21656,-0.1352084 0.48242,-0.5957032 0.48242,-0.5957032 z"
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diff --git a/palemoon/themes/osx/Toolbar.png b/palemoon/themes/osx/Toolbar.png
index 3d1b80ec7..8ec756e03 100644
--- a/palemoon/themes/osx/Toolbar.png
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diff --git a/palemoon/themes/osx/Toolbar.svg b/palemoon/themes/osx/Toolbar.svg
new file mode 100644
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diff --git a/palemoon/themes/osx/aboutCertError.css b/palemoon/themes/osx/aboutCertError.css
index dbb353025..100bb3d3b 100644
--- a/palemoon/themes/osx/aboutCertError.css
+++ b/palemoon/themes/osx/aboutCertError.css
@@ -33,7 +33,7 @@ h2 {
   border-radius: 10px;
   box-shadow: 0px 0px 8px red;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   background: url("chrome://global/skin/icons/sslWarning.png") left 0 no-repeat -moz-Field;
   background-origin: content-box;
 }
@@ -43,16 +43,16 @@ h2 {
 }
 
 #errorTitle {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #errorLongContent {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 .expander > button {
-  -moz-padding-start: 20px;
-  -moz-margin-start: -20px;
+  padding-inline-start: 20px;
+  margin-inline-start: -20px;
   background: url("chrome://browser/skin/aboutCertError_sectionExpanded.png") left center no-repeat;
   border: none;
   font: inherit;
diff --git a/palemoon/themes/osx/aboutPrivateBrowsing.css b/palemoon/themes/osx/aboutPrivateBrowsing.css
index cd6026b8e..35843adce 100644
--- a/palemoon/themes/osx/aboutPrivateBrowsing.css
+++ b/palemoon/themes/osx/aboutPrivateBrowsing.css
@@ -21,7 +21,7 @@ body.normal > #errorPageContainer {
 }
 
 #startPrivateBrowsingDesc > button {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #footerDesc > p {
@@ -30,7 +30,7 @@ body.normal > #errorPageContainer {
 
 #moreInfo {
   font-size: 110%; /* to match the value set in chrome://global/skin/netError.css */
-  -moz-padding-start: 25px;
+  padding-inline-start: 25px;
   background: url("chrome://global/skin/icons/information-16.png") no-repeat top left;
 }
 
diff --git a/palemoon/themes/osx/aboutSyncTabs.css b/palemoon/themes/osx/aboutSyncTabs.css
index 4f21a9d40..1fcd8304f 100644
--- a/palemoon/themes/osx/aboutSyncTabs.css
+++ b/palemoon/themes/osx/aboutSyncTabs.css
@@ -22,18 +22,18 @@
   margin-top: 4px;
   width: 45em;
   height: 32px;
-  -moz-margin-start: 2em;
-  -moz-margin-end: 2em;
+  margin-inline-start: 2em;
+  margin-inline-end: 2em;
 }
 
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;
-  -moz-margin-start: 40px;
+  margin-inline-start: 40px;
 }
 
 richlistitem {
-  -moz-margin-end: 2em;
+  margin-inline-end: 2em;
 }
 
 richlistitem[selected="true"],
@@ -46,7 +46,7 @@ richlistitem[type="tab"] {
   border: #999999 1px solid !important;
   padding: 2px 5px;
   margin-bottom: 4px;
-  -moz-margin-start: 4em;
+  margin-inline-start: 4em;
   border-radius: 6px;
   background-color: menu;
   width: 44em;
@@ -64,7 +64,7 @@ richlistitem[type="tab"][selected="true"] {
 richlistitem[type="client"] {
   min-height: 2em;
   color: #000000;
-  -moz-margin-start: 2em;
+  margin-inline-start: 2em;
   margin-top: 2px;
   margin-bottom: 3px;
   width: 42em;
@@ -96,6 +96,6 @@ richlistitem.desktop[type="client"] {
 }
 
 .tabIcon {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
   padding-top: 2px;
 }
diff --git a/palemoon/themes/osx/appmenu-dropmarker.png b/palemoon/themes/osx/appmenu-dropmarker.png
deleted file mode 100644
index 27deaff72..000000000
--- a/palemoon/themes/osx/appmenu-dropmarker.png
+++ /dev/null
diff --git a/palemoon/themes/osx/appmenu-icons.png b/palemoon/themes/osx/appmenu-icons.png
deleted file mode 100644
index 78f365816..000000000
--- a/palemoon/themes/osx/appmenu-icons.png
+++ /dev/null
diff --git a/palemoon/themes/osx/autocomplete.css b/palemoon/themes/osx/autocomplete.css
index a50dbd823..7f63bef19 100644
--- a/palemoon/themes/osx/autocomplete.css
+++ b/palemoon/themes/osx/autocomplete.css
@@ -129,15 +129,15 @@ treechildren.private-autocomplete-treebody::-moz-tree-cell-text(selected) {
   width: 16px; 
   height: 16px;
   margin-bottom: -1px;
-  -moz-margin-start: 7px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 7px;
+  margin-inline-end: 5px;
 }
 
 .ac-type-icon {
   width: 16px;
   height: 16px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 6px;
+  margin-inline-end: 4px;
 }
 
 .ac-url-box > .ac-site-icon,
diff --git a/palemoon/themes/osx/browser.css b/palemoon/themes/osx/browser.css
index 66f4fd006..2c6d9eddb 100644
--- a/palemoon/themes/osx/browser.css
+++ b/palemoon/themes/osx/browser.css
@@ -9,22 +9,58 @@
 
 %include shared.inc
 %filter substitution
-%define toolbarHighlight rgba(255,255,255,.5)
-%define selectedTabHighlight rgba(255,255,255,.7)
 %define toolbarShadowColor rgba(10%,10%,10%,.4)
 %define toolbarShadowOnTab linear-gradient(to top, rgba(10%,10%,10%,.4) 1px, transparent 1px)
-%define bgTabTexture linear-gradient(transparent, hsla(0,0%,45%,.1) 1px, hsla(0,0%,32%,.2) 80%, hsla(0,0%,0%,.2))
-%define bgTabTextureHover linear-gradient(hsla(0,0%,100%,.3) 1px, hsla(0,0%,75%,.2) 80%, hsla(0,0%,60%,.2))
 %define navbarTextboxCustomBorder border-color: rgba(0,0,0,.32);
 %define navbarLargeIcons #navigator-toolbox[iconsize=large][mode=icons] > #nav-bar
 %define forwardTransitionLength 150ms
 %define conditionalForwardWithUrlbar window:not([chromehidden~=toolbar]) #navigator-toolbox[iconsize=large][mode=icons] > :-moz-any(#nav-bar[currentset*="unified-back-forward-button"],#nav-bar:not([currentset])) > #unified-back-forward-button
 %define conditionalForwardWithUrlbarWidth 27
 
+:root {
+  --toolbox-after-color: ThreeDShadow;
+
+  --toolbar-custom-color: -moz-Dialog;
+  --toolbar-highlight-top: rgba(255,255,255,.5);
+  --toolbar-highlight-bottom: transparent;
+
+  --toolbarbutton-background-color: hsla(210,32%,93%,.3);
+  --toolbarbutton-border-radius: 2.5px;
+  --toolbarbutton-border-color: hsla(210,54%,20%,.2);
+
+  --toolbarbutton-image: url("chrome://browser/skin/Toolbar.png");
+  --toolbarbutton-inverted-image: url("chrome://browser/skin/Toolbar-inverted.png");
+
+  --tab-background: linear-gradient(transparent, hsla(0,0%,45%,.1) 1px, hsla(0,0%,32%,.2) 80%, hsla(0,0%,0%,.2));
+  --tab-background-hover: linear-gradient(hsla(0,0%,100%,.3) 1px, hsla(0,0%,75%,.2) 80%, hsla(0,0%,60%,.2));
+  --tab-border-radius: 6px;
+  --tab-box-shadow: inset 0.5px 1px 1px var(--tab-selected-highlight);
+  --tab-selected-highlight: rgba(255,255,255,.7);
+}
+
+/* Use SVG for HiDPI 133%+ */
+@media (min-resolution: 1.33dppx) {
+  :root {
+    --toolbarbutton-image: url("chrome://browser/skin/Toolbar.svg");
+    --toolbarbutton-inverted-image: url("chrome://browser/skin/Toolbar-inverted.svg");
+  }
+}
+
+:root:-moz-lwtheme-brighttext {
+  --toolbar-highlight-top: rgba(32,32,32,.8);
+  --toolbar-highlight-bottom: rgba(32,32,32,0);
+}
+
+:root:-moz-lwtheme-darktext {
+  --toolbar-highlight-top: rgba(255,255,255,.8);
+  
+  --tab-selected-highlight: rgba(255,255,255,.6);
+}
+
 #navigator-toolbox {
-    -moz-appearance: none;
-    background-color: transparent;
-    border-top: none;
+  -moz-appearance: none;
+  background-color: transparent;
+  border-top: none;
 }
 
 #main-window {
@@ -33,115 +69,127 @@
 }
 
 #navigator-toolbox::after {
-    content: "";
-    display: -moz-box;
-    -moz-box-ordinal-group: 101; /* tabs toolbar is 100 */
-    height: 1px;
-    background-color: ThreeDShadow;
+  content: "";
+  display: -moz-box;
+  -moz-box-ordinal-group: 101; /* tabs toolbar is 100 */
+  height: 1px;
+  background-color: var(--toolbox-after-color);
 }
 #navigator-toolbox[tabsontop=false]::after,
 #main-window[disablechrome] #navigator-toolbox::after {
-    visibility: collapse;
+  visibility: collapse;
 }
 
 #navigator-toolbox > toolbar:not(:-moz-lwtheme) {
-    -moz-appearance: none;
-    border-style: none;
-    background-color: -moz-Dialog;
+  -moz-appearance: none;
+  border-style: none;
+  background-color: var(--toolbar-custom-color);
 }
 
 #nav-bar[tabsontop=true]:not(:-moz-lwtheme),
 #nav-bar[tabsontop=true][collapsed=true]:not([customizing]):not(:-moz-lwtheme) + toolbar,
 #nav-bar[tabsontop=true][collapsed=true]:not([customizing]):not(:-moz-lwtheme) + #customToolbars + #PersonalToolbar {
-    background-image: linear-gradient(@toolbarHighlight@, rgba(255,255,255,0));
+  background-image: linear-gradient(var(--toolbar-highlight-top), var(--toolbar-highlight-bottom));
 }
 
-#nav-bar[tabsontop=true]:-moz-lwtheme,
-#nav-bar[tabsontop=true][collapsed=true]:not([customizing]):-moz-lwtheme + toolbar,
-#nav-bar[tabsontop=true][collapsed=true]:not([customizing]):-moz-lwtheme + #customToolbars + #PersonalToolbar {
-    background-image: linear-gradient(rgba(255,255,255,.8), rgba(255,255,255,0));
+/* Blend the topmost toolbar with the titlebar */
+%ifdef MOZ_CAN_DRAW_IN_TITLEBAR
+#main-window[tabsontop=false]:not([privatebrowsingmode=temporary]) #nav-bar:not(:-moz-lwtheme),
+#main-window[tabsontop=false]:not([privatebrowsingmode=temporary]) #PersonalToolbar[collapsed=true]
+ ~ #TabsToolbar:not(:-moz-lwtheme),
+#main-window[tabsontop=true]:not([privatebrowsingmode=temporary]) #TabsToolbar:not(:-moz-lwtheme) {
+  -moz-appearance: toolbar;
+}
+
+#main-window[tabsontop=false][privatebrowsingmode=temporary] #nav-bar:not(:-moz-lwtheme),
+#main-window[tabsontop=false][privatebrowsingmode=temporary] #PersonalToolbar[collapsed=true]
+ ~ #TabsToolbar:not(:-moz-lwtheme),
+#main-window[tabsontop=true][privatebrowsingmode=temporary] #TabsToolbar:not(:-moz-lwtheme) {
+  background-color: transparent;
 }
 
-#nav-bar[tabsontop=true]:-moz-lwtheme-brighttext,
-#nav-bar[tabsontop=true][collapsed=true]:not([customizing]):-moz-lwtheme-brighttext + toolbar,
-#nav-bar[tabsontop=true][collapsed=true]:not([customizing]):-moz-lwtheme-brighttext + #customToolbars + #PersonalToolbar {
-    background-image: linear-gradient(rgba(32,32,32,.8), rgba(32,32,32,0));
+#main-window[tabsontop=false][privatebrowsingmode=temporary] #nav-bar:not(:-moz-lwtheme) {
+  border-bottom: 1px solid rgba(26,26,26,0.2);
 }
+%else
+#main-window[tabsontop=false] #nav-bar:not(:-moz-lwtheme),
+#main-window[tabsontop=false] #PersonalToolbar[collapsed=true]
+ ~ #TabsToolbar:not(:-moz-lwtheme),
+#main-window[tabsontop=true] #TabsToolbar:not(:-moz-lwtheme) {
+  -moz-appearance: toolbar;
+}
+%endif
 
 #personal-bookmarks {
-    min-height: 24px;
+  min-height: 24px;
 }
 
 #print-preview-toolbar:not(:-moz-lwtheme) {
-    -moz-appearance: toolbox;
+  -moz-appearance: toolbox;
 }
 
 #browser-bottombox:not(:-moz-lwtheme) {
-    background-color: -moz-dialog;
+  background-color: var(--toolbar-custom-color);
 }
 
 
-
+%ifdef MOZ_CAN_DRAW_IN_TITLEBAR
 /* ::::: titlebar ::::: */
 
 #main-window[sizemode="normal"]:not([privatebrowsingmode=temporary]) > #titlebar {
-    -moz-appearance: -moz-window-titlebar;
+  -moz-appearance: -moz-window-titlebar;
 }
 
 #main-window[sizemode="maximized"] > #titlebar {
-    -moz-appearance: -moz-window-titlebar-maximized;
+  -moz-appearance: -moz-window-titlebar-maximized;
 }
 
 #titlebar-buttonbox {
-    -moz-appearance: -moz-window-button-box;
-}
-
-#main-window[sizemode="maximized"] #titlebar-buttonbox {
-    -moz-appearance: -moz-window-button-box-maximized;
+  -moz-appearance: -moz-window-button-box;
 }
 
 .titlebar-placeholder[type="appmenu-button"] {
-    margin-left: 4px;
+  margin-left: 4px;
 }
 
 .titlebar-placeholder[type="caption-buttons"] {
-    margin-left: 10px;
+  margin-left: 10px;
 }
 
 /* titlebar command buttons */
 
 #titlebar-min {
-    -moz-appearance: -moz-window-button-minimize;
+  -moz-appearance: -moz-window-button-minimize;
 }
 
 #titlebar-max {
-    -moz-appearance: -moz-window-button-maximize;
+  -moz-appearance: -moz-window-button-maximize;
 }
 
 #main-window[sizemode="maximized"] #titlebar-max {
-    -moz-appearance: -moz-window-button-restore;
+  -moz-appearance: -moz-window-button-restore;
 }
 
 #titlebar-close {
-    -moz-appearance: -moz-window-button-close;
+  -moz-appearance: -moz-window-button-close;
 }
 
 /* ensure titlebar on privacy windows is of correct size */
 #titlebar {
-    height: 22px;
+  height: 22px;
 }
 
 /* ensure extra titlebar doesn't appear on normal (e.g. non-privacy) windows */
 #main-window:not([privatebrowsingmode=temporary]):not(:-moz-lwtheme) > #titlebar > #titlebar-content > #titlebar-buttonbox-container,
 #main-window:not([drawintitlebar=true]):not(:-moz-lwtheme) > #titlebar {
-    display: none;
+  display: none;
 }
 
 #titlebar-buttonbox-container {
   margin-left: 7px;
   margin-top: 3px;
 }
-
+%endif
 /* ::::: bookmark toolbar ::::: */
 
 #personal-bookmarks {
@@ -168,40 +216,48 @@ toolbarbutton.chevron:-moz-locale-dir(rtl) > .toolbarbutton-icon {
 
 @media (min-resolution: 2dppx) {
   toolbarbutton.chevron {
-    list-style-image: url("chrome://global/skin/icons/chevron@2x.png");
+  list-style-image: url("chrome://global/skin/icons/chevron@2x.png");
   }
 
   toolbarbutton.chevron > .toolbarbutton-icon {
-    width: 13px;
+  width: 13px;
   }
 }
 
 /* ::::: bookmark buttons ::::: */
 
 toolbarbutton.bookmark-item {
-  color: #222;
   border: 0;
   border-radius: 10000px;
   padding: 1px 8px;
   margin: 0 0 1px;
 }
 
+toolbarbutton.bookmark-item:not(:-moz-lwtheme) {
+  color: #222;
+}
+
+toolbarbutton.bookmark-item:-moz-lwtheme {
+  color: inherit;
+  text-shadow: inherit;
+}
+
 .bookmark-item > .toolbarbutton-menu-dropmarker {
   list-style-image: url("chrome://browser/skin/places/folderDropArrow.png");
   -moz-image-region: rect(0, 7px, 5px, 0);
   margin-top: 1px;
-  -moz-margin-start: 3px;
-  -moz-margin-end: -2px;
+  margin-inline-start: 3px;
+  margin-inline-end: -2px;
 }
 
 @media (min-resolution: 2dppx) {
   .bookmark-item > .toolbarbutton-menu-dropmarker {
-    list-style-image: url("chrome://browser/skin/places/folderDropArrow@2x.png");
-    -moz-image-region: rect(0, 14px, 10px, 0);
+  list-style-image: url("chrome://browser/skin/places/folderDropArrow@2x.png");
+  -moz-image-region: rect(0, 14px, 10px, 0);
   }
 
   .bookmark-item > .toolbarbutton-menu-dropmarker > .dropmarker-icon {
-    width: 7px;
+  width: 7px;
   }
 }
 
@@ -215,21 +271,28 @@ toolbarbutton.bookmark-item[open="true"] {
   background-color: rgba(0, 0, 0, .205);
 }
 
-toolbarbutton.bookmark-item:hover,
-toolbarbutton.bookmark-item[open="true"] {
-  color: #FFF !important;
-  text-shadow: 0 1px rgba(0, 0, 0, .4) !important;
+toolbarbutton.bookmark-item:-moz-lwtheme-brighttext:hover,
+toolbarbutton.bookmark-item[open="true"]:-moz-lwtheme-brighttext {
+  background-color: rgba(255, 255, 255, .3);
 }
 
+toolbarbutton.bookmark-item:not(:-moz-lwtheme):hover,
+toolbarbutton.bookmark-item[open="true"]:not(:-moz-lwtheme) {
+  color: #FFF;
+  text-shadow: 0 1px rgba(0, 0, 0, .4);
+}
+
+.bookmark-item:-moz-lwtheme-brighttext > .toolbarbutton-menu-dropmarker,
 .bookmark-item:hover > .toolbarbutton-menu-dropmarker,
 .bookmark-item[open="true"] > .toolbarbutton-menu-dropmarker {
   -moz-image-region: rect(5px, 7px, 10px, 0);
 }
 
 @media (min-resolution: 2dppx) {
+  .bookmark-item:-moz-lwtheme-brighttext > .toolbarbutton-menu-dropmarker,
   .bookmark-item:hover > .toolbarbutton-menu-dropmarker,
   .bookmark-item[open="true"] > .toolbarbutton-menu-dropmarker {
-    -moz-image-region: rect(10px, 14px, 20px, 0);
+  -moz-image-region: rect(10px, 14px, 20px, 0);
   }
 }
 
@@ -239,9 +302,14 @@ toolbarbutton.bookmark-item[open="true"] {
   background-color: rgba(0, 0, 0, .5);
 }
 
+toolbarbutton.bookmark-item:-moz-lwtheme-brighttext:hover,
+toolbarbutton.bookmark-item[open="true"]:-moz-lwtheme-brighttext {
+  background-color: rgba(255,255,255, .3);
+}
+
 toolbarbutton.bookmark-item > menupopup {
   margin-top: 2px;
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
 }
 
 .bookmark-item > .toolbarbutton-icon {
@@ -252,7 +320,7 @@ toolbarbutton.bookmark-item > menupopup {
 
 .bookmark-item > .toolbarbutton-icon[label]:not([label=""]),
 .bookmark-item > .toolbarbutton-icon[type="menu"] {
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 
 .bookmark-item[container] {
@@ -294,35 +362,35 @@ toolbarbutton.bookmark-item > menupopup {
 
 @media (min-resolution: 2dppx) {
   .bookmark-item[container] {
-    list-style-image: url("chrome://global/skin/tree/folder@2x.png");
+  list-style-image: url("chrome://global/skin/tree/folder@2x.png");
   }
 
   .bookmark-item[container][livemark] {
-    list-style-image: url("chrome://browser/skin/page-livemarks@2x.png");
+  list-style-image: url("chrome://browser/skin/page-livemarks@2x.png");
   }
 
   .bookmark-item[container][livemark] .bookmark-item {
-    list-style-image: url("chrome://browser/skin/places/livemark-item.png");
+  list-style-image: url("chrome://browser/skin/places/livemark-item.png");
   }
 
   .bookmark-item[container][query] {
-    list-style-image: url("chrome://browser/skin/places/query@2x.png");
+  list-style-image: url("chrome://browser/skin/places/query@2x.png");
   }
 
   .bookmark-item[query][tagContainer] {
-    list-style-image: url("chrome://browser/skin/places/tag@2x.png");
+  list-style-image: url("chrome://browser/skin/places/tag@2x.png");
   }
 
   .bookmark-item[query][dayContainer] {
-    list-style-image: url("chrome://browser/skin/places/history@2x.png");
+  list-style-image: url("chrome://browser/skin/places/history@2x.png");
   }
 
   .bookmark-item[query][hostContainer] {
-    list-style-image: url("chrome://global/skin/tree/folder@2x.png");
+  list-style-image: url("chrome://global/skin/tree/folder@2x.png");
   }
 
   .bookmark-item[query][hostContainer][open] {
-    list-style-image: url("chrome://global/skin/tree/folder@2x.png");
+  list-style-image: url("chrome://global/skin/tree/folder@2x.png");
   }
 }
 
@@ -346,7 +414,7 @@ toolbarbutton.bookmark-item > menupopup {
 @media (min-resolution: 2dppx) {
   .bookmark-item > .toolbarbutton-icon,
   .bookmark-item > .menu-iconic-left > .menu-iconic-icon {
-    image-rendering: -moz-crisp-edges;
+  image-rendering: -moz-crisp-edges;
   }
 }
 
@@ -361,16 +429,16 @@ toolbarbutton.bookmark-item > menupopup {
 
 @media (min-resolution: 2dppx) {
   #wrapper-personal-bookmarks[place="palette"] > .toolbarpaletteitem-box {
-    background-image: url("chrome://browser/skin/places/bookmarksToolbar@2x.png");
-    background-size: 16px;
+  background-image: url("chrome://browser/skin/places/bookmarksToolbar@2x.png");
+  background-size: 16px;
   }
 
   .bookmarks-toolbar-customize {
-    list-style-image: url("chrome://browser/skin/places/bookmarksToolbar@2x.png") !important;
+  list-style-image: url("chrome://browser/skin/places/bookmarksToolbar@2x.png") !important;
   }
 
   .bookmarks-toolbar-customize > .toolbarbutton-icon {
-    width: 16px;
+  width: 16px;
   }
 }
 
@@ -384,11 +452,11 @@ toolbarbutton.bookmark-item > menupopup {
 /* ::::: primary toolbar buttons ::::: */
 
 .toolbarbutton-1 {
-    list-style-image: url("chrome://browser/skin/Toolbar.png");
+  list-style-image: var(--toolbarbutton-image);
 }
 
 toolbar[brighttext] .toolbarbutton-1 {
-    list-style-image: url("chrome://browser/skin/Toolbar-inverted.png");
+  list-style-image: var(--toolbarbutton-inverted-image);
 }
 
 .toolbarbutton-1[disabled=true] > .toolbarbutton-icon,
@@ -396,136 +464,136 @@ toolbar[brighttext] .toolbarbutton-1 {
 .toolbarbutton-1[disabled=true] > .toolbarbutton-menubutton-dropmarker,
 .toolbarbutton-1[disabled=true] > .toolbarbutton-menubutton-button > .toolbarbutton-icon,
 .toolbarbutton-1 > .toolbarbutton-menubutton-button[disabled] > .toolbarbutton-icon {
-    opacity: .4;
+  opacity: .4;
 }
 
 .toolbarbutton-1 > .toolbarbutton-menu-dropmarker,
 .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
-    list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow.png");
+  list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow.png");
 }
 
 toolbar[brighttext] .toolbarbutton-1 > .toolbarbutton-menu-dropmarker,
 toolbar[brighttext] .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
-    list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow-inverted.png");
+  list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow-inverted.png");
 }
 
 .toolbarbutton-1 > .toolbarbutton-icon,
 .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
-    -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 toolbar[mode=full] .toolbarbutton-1:not([type=menu-button]) {
-    -moz-box-orient: vertical;
+  -moz-box-orient: vertical;
 }
 
 toolbar[mode=full] .toolbarbutton-1,
 toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
-    min-width: 57px;
+  min-width: 57px;
 }
 
 #nav-bar {
-    /* force iconsize="small" on this toolbar */
-    counter-reset: smallicons;
+  /* force iconsize="small" on this toolbar */
+  counter-reset: smallicons;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1,
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button {
-    -moz-appearance: none;
-    border: none;
-    padding: 0;
-    background: none;
+  -moz-appearance: none;
+  border: none;
+  padding: 0;
+  background: none;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1:not([type=menu-button]),
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button,
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
-    padding: 5px 2px;
-    -moz-box-pack: center;
+  padding: 5px 2px;
+  -moz-box-pack: center;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1[type=menu]:not(#back-button):not(#forward-button):not(#feed-button) {
-    padding-left: 5px;
-    padding-right: 5px;
+  padding-left: 5px;
+  padding-right: 5px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > menupopup {
-    margin-top: -3px;
+  margin-top: -3px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button {
-    -moz-padding-end: 0;
+  padding-inline-end: 0;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
-    -moz-padding-start: 0;
-    -moz-box-align: center;
+  padding-inline-start: 0;
+  -moz-box-align: center;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-badge-stack,
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
-    padding: 2px 6px;
-    background: hsla(210,32%,93%,.3) padding-box;
-    background-image: linear-gradient(hsla(0,0%,100%,.4), hsla(0,0%,100%,.1));
-    background-clip: padding-box;
-    border-radius: 2.5px;
-    border: 1px solid;
-    border-color: hsla(210,54%,20%,.2) hsla(210,54%,20%,.2) hsla(210,54%,20%,.2);
-    box-shadow: 0 1px hsla(0,0%,100%,.05) inset,
-        0 1px hsla(210,54%,20%,.05),
-        0 0 2px hsla(210,54%,20%,.05);
-    transition-property: background-image, background-color, border-color, box-shadow;
-    transition-duration: 150ms;
+  padding: 2px 6px;
+  background: var(--toolbarbutton-background-color) padding-box;
+  background-image: linear-gradient(hsla(0,0%,100%,.4), hsla(0,0%,100%,.1));
+  background-clip: padding-box;
+  border-radius: var(--toolbarbutton-border-radius);
+  border: 1px solid;
+  border-color: var(--toolbarbutton-border-color) var(--toolbarbutton-border-color) var(--toolbarbutton-border-color);
+  box-shadow: 0 1px hsla(0,0%,100%,.05) inset,
+              0 1px hsla(210,54%,20%,.05),
+              0 0 2px hsla(210,54%,20%,.05);
+  transition-property: background-image, background-color, border-color, box-shadow;
+  transition-duration: 150ms;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1:not(:-moz-any(@primaryToolbarButtons@)) > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1:not(:-moz-any(@primaryToolbarButtons@)) > .toolbarbutton-badge-stack,
 @navbarLargeIcons@ .toolbarbutton-1:not(:-moz-any(@primaryToolbarButtons@)) > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
-    padding: 3px 7px;
+  padding: 3px 7px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1[type=menu]:not(#back-button):not(#forward-button):not(#feed-button) > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1[type=menu] > .toolbarbutton-text /* hack for add-ons that forcefully display the label */ {
-    -moz-padding-end: 17px;
+  padding-inline-end: 17px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menu-dropmarker {
-    -moz-margin-start: -15px;
+  margin-inline-start: -15px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
-    -moz-border-end: none;
+  border-inline-end: none;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
-    padding: 8px 5px 7px;
+  padding: 8px 5px 7px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1:not(:hover):not(:active):not([open]) > .toolbarbutton-menubutton-dropmarker::before {
-    content: "";
-    display: -moz-box;
-    width: 1px;
-    height: 18px;
-    -moz-margin-end: -1px;
-    background-image: linear-gradient(hsla(210,54%,20%,.2) 0, hsla(210,54%,20%,.2) 18px);
-    background-clip: padding-box;
-    background-position: center;
-    background-repeat: no-repeat;
-    background-size: 1px 18px;
-    box-shadow: 0 0 0 1px hsla(0,0%,100%,.2);
+  content: "";
+  display: -moz-box;
+  width: 1px;
+  height: 18px;
+  margin-inline-end: -1px;
+  background-image: linear-gradient(var(--toolbarbutton-border-color) 0, var(--toolbarbutton-border-color) 18px);
+  background-clip: padding-box;
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 1px 18px;
+  box-shadow: 0 0 0 1px hsla(0,0%,100%,.2);
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon:-moz-locale-dir(ltr),
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon:-moz-locale-dir(rtl) {
-    border-top-right-radius: 0;
-    border-bottom-right-radius: 0;
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon:-moz-locale-dir(rtl),
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon:-moz-locale-dir(ltr) {
-    border-top-left-radius: 0;
-    border-bottom-left-radius: 0;
+  border-top-left-radius: 0;
+  border-bottom-left-radius: 0;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1:not([disabled]):-moz-any(:hover,[open]) > .toolbarbutton-menubutton-button > .toolbarbutton-icon,
@@ -533,56 +601,56 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
 @navbarLargeIcons@ .toolbarbutton-1:not([disabled]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1:not([disabled]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-badge-stack,
 @conditionalForwardWithUrlbar@ > .toolbarbutton-1:-moz-any([disabled],:not([open]):not([disabled]):not(:active)) > .toolbarbutton-icon {
-    background-image: linear-gradient(hsla(0,0%,100%,.8), hsla(0,0%,100%,.5));
-    border-color: hsla(210,54%,20%,.25) hsla(210,54%,20%,.3) hsla(210,54%,20%,.35);
-    box-shadow: 0 1px hsla(0,0%,100%,.3) inset,
-        0 1px hsla(210,54%,20%,.03),
-        0 0 2px hsla(210,54%,20%,.1);
-    transition-property: background-image, background-color, border-color, box-shadow;
-    transition-duration: 150ms;
+  background-image: linear-gradient(hsla(0,0%,100%,.8), hsla(0,0%,100%,.5));
+  border-color: hsla(210,54%,20%,.25) hsla(210,54%,20%,.3) hsla(210,54%,20%,.35);
+  box-shadow: 0 1px hsla(0,0%,100%,.3) inset,
+              0 1px hsla(210,54%,20%,.03),
+              0 0 2px hsla(210,54%,20%,.1);
+  transition-property: background-image, background-color, border-color, box-shadow;
+  transition-duration: 150ms;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button:not([disabled]):not([open]):not(:active):hover > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1:not([buttonover]):not([open]):not(:active):hover > .toolbarbutton-menubutton-dropmarker:not([disabled]) > .dropmarker-icon,
 @conditionalForwardWithUrlbar@ > #forward-button:not([open]):not(:active):not([disabled]):hover > .toolbarbutton-icon {
-    border-color: hsla(210,54%,20%,.3) hsla(210,54%,20%,.35) hsla(210,54%,20%,.4);
-    background-color: hsla(210,48%,96%,.75);
-    box-shadow: 0 0 1px hsla(210,54%,20%,.03),
-        0 0 2px hsla(210,54%,20%,.1);
+  border-color: hsla(210,54%,20%,.3) hsla(210,54%,20%,.35) hsla(210,54%,20%,.4);
+  background-color: hsla(210,48%,96%,.75);
+  box-shadow: 0 0 1px hsla(210,54%,20%,.03),
+    0 0 2px hsla(210,54%,20%,.1);
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button:not([disabled]):hover:active > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1[open] > .toolbarbutton-menubutton-dropmarker:not([disabled]) > .dropmarker-icon,
 @navbarLargeIcons@ .toolbarbutton-1:not([disabled]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1:not([disabled]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-badge-stack {
-    background-image: linear-gradient(hsla(0,0%,100%,.6), hsla(0,0%,100%,.1));
-    background-color: hsla(210,54%,20%,.15);
-    border-color: hsla(210,54%,20%,.3) hsla(210,54%,20%,.35) hsla(210,54%,20%,.4);
-    box-shadow: 0 1px 1px hsla(210,54%,20%,.1) inset,
-        0 0 1px hsla(210,54%,20%,.2) inset,
-        /* allows windows-keyhole-forward-clip-path to be used for non-hover as well as hover: */
-        0 1px 0 hsla(210,54%,20%,0),
-        0 0 2px hsla(210,54%,20%,0);
-    text-shadow: none;
-    transition: none;
+  background-image: linear-gradient(hsla(0,0%,100%,.6), hsla(0,0%,100%,.1));
+  background-color: hsla(210,54%,20%,.15);
+  border-color: hsla(210,54%,20%,.3) hsla(210,54%,20%,.35) hsla(210,54%,20%,.4);
+  box-shadow: 0 1px 1px hsla(210,54%,20%,.1) inset,
+              0 0 1px var(--toolbarbutton-border-color) inset,
+              /* allows osx-keyhole-forward-clip-path to be used for non-hover as well as hover: */
+              0 1px 0 hsla(210,54%,20%,0),
+              0 0 2px hsla(210,54%,20%,0);
+  text-shadow: none;
+  transition: none;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1:-moz-any(:hover,[open]) > .toolbarbutton-menubutton-dropmarker:not([disabled]) > .dropmarker-icon {
-    -moz-border-start-color: hsla(210,54%,20%,.35);
+  border-inline-start-color: hsla(210,54%,20%,.35);
 }
 
 @navbarLargeIcons@ .toolbarbutton-1[checked]:not(:active):hover > .toolbarbutton-icon {
-    background-color: rgba(90%,90%,90%,.4);
-    transition: background-color .4s;
+  background-color: rgba(90%,90%,90%,.4);
+  transition: background-color .4s;
 }
 
 :-moz-any(#TabsToolbar, #addon-bar) .toolbarbutton-1,
 :-moz-any(#TabsToolbar, #addon-bar) .toolbarbutton-1 > .toolbarbutton-menubutton-button,
 .tabbrowser-arrowscrollbox > .scrollbutton-up,
 .tabbrowser-arrowscrollbox > .scrollbutton-down {
-    -moz-appearance: none;
-    border-style: none;
-    padding: 0 3px;
+  -moz-appearance: none;
+  border-style: none;
+  padding: 0 3px;
 }
 
 #TabsToolbar .toolbarbutton-1:not([disabled]):hover,
@@ -590,230 +658,231 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
 #TabsToolbar .toolbarbutton-1 > .toolbarbutton-menubutton-button:not([disabled]):hover,
 .tabbrowser-arrowscrollbox > .scrollbutton-up:not([disabled]):hover,
 .tabbrowser-arrowscrollbox > .scrollbutton-down:not([disabled]):hover {
-    background-image: linear-gradient(rgba(255,255,255,0), rgba(255,255,255,.5)),
-        linear-gradient(transparent, rgba(0,0,0,.25) 30%),
-        linear-gradient(transparent, rgba(0,0,0,.25) 30%);
-    background-position: 1px -1px, 0 -1px, 100% -1px;
-    background-size: calc(100% - 2px) 100%, 1px 100%, 1px 100%;
-    background-repeat: no-repeat;
+  background-image: linear-gradient(var(--toolbar-highlight-bottom), var(--toolbar-highlight-top)),
+                    linear-gradient(transparent, rgba(0,0,0,.25) 30%),
+                    linear-gradient(transparent, rgba(0,0,0,.25) 30%);
+  background-position: 1px -1px, 0 -1px, 100% -1px;
+  background-size: calc(100% - 2px) 100%, 1px 100%, 1px 100%;
+  background-repeat: no-repeat;
 }
 
 #addon-bar .toolbarbutton-1:not([disabled]):hover,
 #addon-bar .toolbarbutton-1[open],
 #addon-bar .toolbarbutton-1 > .toolbarbutton-menubutton-button:not([disabled]):hover {
-    background-image: linear-gradient(to top, transparent, rgba(0,0,0,.15)),
-        linear-gradient(to top, transparent, rgba(0,0,0,.15) 30%),
-        linear-gradient(to top, transparent, rgba(0,0,0,.15) 30%);
-    background-position: left, left, right;
-    background-size: auto, 1px 100%, 1px 100%;
-    background-repeat: no-repeat;
+  background-image: linear-gradient(to top, transparent, rgba(0,0,0,.15)),
+                    linear-gradient(to top, transparent, rgba(0,0,0,.15) 30%),
+                    linear-gradient(to top, transparent, rgba(0,0,0,.15) 30%);
+  background-position: left, left, right;
+  background-size: auto, 1px 100%, 1px 100%;
+  background-repeat: no-repeat;
 }
 
 /* unified back/forward button */
 
 #back-button {
-    -moz-image-region: rect(0, 18px, 18px, 0);
+  -moz-image-region: rect(0, 18px, 18px, 0);
 }
 
 #forward-button {
-    -moz-image-region: rect(0, 36px, 18px, 18px);
+  -moz-image-region: rect(0, 36px, 18px, 18px);
 }
 
 #back-button:-moz-locale-dir(rtl) > .toolbarbutton-icon,
 #forward-button:-moz-locale-dir(rtl),
 #forward-button:-moz-locale-dir(rtl) > .toolbarbutton-text {
-    transform: scaleX(-1);
+  transform: scaleX(-1);
 }
 
 @conditionalForwardWithUrlbar@ {
-    -moz-box-align: center;
+  -moz-box-align: center;
 }
 
 @conditionalForwardWithUrlbar@ > #forward-button {
-    padding: 0;
+  padding: 0;
 }
 
 @conditionalForwardWithUrlbar@ > #forward-button > menupopup {
-    margin-top: 1px;
+  margin-top: 1px;
 }
 
 @conditionalForwardWithUrlbar@ > #forward-button > .toolbarbutton-icon {
-    /*mask: url(keyhole-forward-mask.svg#mask); XXX: this regresses twinopen */
-    clip-path: url(chrome://browser/content/browser.xul#windows-keyhole-forward-clip-path);
-    -moz-margin-start: -6px !important;
-    border-left-style: none;
-    border-radius: 0;
-    padding-left: 7px;
-    padding-right: 3px;
+  /*mask: url(keyhole-forward-mask.svg#mask); XXX: this regresses twinopen */
+  clip-path: url(chrome://browser/content/browser.xul#osx-keyhole-forward-clip-path);
+  margin-inline-start: -9px !important;
+  border-left-style: none;
+  border-radius: 0;
+  padding-left: 7px;
+  padding-right: 3px;
 }
 
 @conditionalForwardWithUrlbar@:not([switchingtabs]) > #forward-button {
-    transition: opacity @forwardTransitionLength@ ease-out;
+  transition: opacity @forwardTransitionLength@ ease-out;
 }
 
 @conditionalForwardWithUrlbar@:not(:hover) > #forward-button[disabled] {
-    /*  opacity: 0; */
+  /*  opacity: 0; */
 }
 
 @conditionalForwardWithUrlbar@ > #back-button {
-    -moz-image-region: rect(18px, 20px, 38px, 0);
-    padding-top: 3px;
-    padding-bottom: 3px;
-    -moz-padding-start: 5px;
-    -moz-padding-end: 0;
-    position: relative;
-    z-index: 1;
-    border-radius: 0 10000px 10000px 0;
+  -moz-image-region: rect(18px, 20px, 38px, 0);
+  padding-top: 3px;
+  padding-bottom: 3px;
+  padding-inline-start: 5px;
+  padding-inline-end: 0;
+  position: relative;
+  z-index: 1;
+  border-radius: 0 10000px 10000px 0;
 }
 
 @conditionalForwardWithUrlbar@ > #back-button:-moz-locale-dir(rtl) {
-    border-radius: 10000px 0 0 10000px;
+  border-radius: 10000px 0 0 10000px;
 }
 
 @conditionalForwardWithUrlbar@ > #back-button > menupopup {
-    margin-top: -1px;
+  margin-top: -1px;
 }
 
 @conditionalForwardWithUrlbar@ > #back-button > .toolbarbutton-icon {
-    border-radius: 10000px;
-    padding: 5px;
-    border: none;
-    background-image: linear-gradient(hsla(0,0%,100%,.6), hsla(0,0%,100%,.1));
-    box-shadow: 0 1px 0 hsla(0,0%,100%,.3) inset,
-        0 0 0 1px hsla(0,0%,100%,.3) inset,
-        0 0 0 1px hsla(210,54%,20%,.25),
-        0 1px 0 hsla(210,54%,20%,.35);
-    transition-property: background-color, box-shadow;
-    transition-duration: 250ms;
+  border-radius: 10000px;
+  padding: 5px;
+  border: none;
+  background-image: linear-gradient(hsla(0,0%,100%,.6), hsla(0,0%,100%,.1));
+  box-shadow: 0 1px 0 hsla(0,0%,100%,.3) inset,
+              0 0 0 1px hsla(0,0%,100%,.3) inset,
+              0 0 0 1px hsla(210,54%,20%,.25),
+              0 1px 0 hsla(210,54%,20%,.35);
+  transition-property: background-color, box-shadow;
+  transition-duration: 250ms;
 }
 
 @conditionalForwardWithUrlbar@ > #back-button:not([disabled="true"]):not([open="true"]):not(:active):hover > .toolbarbutton-icon {
-    background-color: hsla(210,48%,96%,.75);
-    box-shadow: 0 1px 0 hsla(0,0%,100%,.3) inset,
-        0 0 0 1px hsla(0,0%,100%,.3) inset,
-        0 0 0 1px hsla(210,54%,20%,.3),
-        0 1px 0 hsla(210,54%,20%,.4),
-        0 0 4px hsla(210,54%,20%,.2);
+  background-color: hsla(210,48%,96%,.75);
+  box-shadow: 0 1px 0 hsla(0,0%,100%,.3) inset,
+              0 0 0 1px hsla(0,0%,100%,.3) inset,
+              0 0 0 1px hsla(210,54%,20%,.3),
+              0 1px 0 hsla(210,54%,20%,.4),
+              0 0 4px var(--toolbarbutton-border-color);
 }
 
 @conditionalForwardWithUrlbar@ > #back-button:not([disabled="true"]):hover:active > .toolbarbutton-icon,
 @conditionalForwardWithUrlbar@ > #back-button[open="true"] > .toolbarbutton-icon {
-    background-color: hsla(210,54%,20%,.15);
-    box-shadow: 0 1px 1px hsla(210,54%,20%,.1) inset,
-        0 0 1px hsla(210,54%,20%,.2) inset,
-        0 0 0 1px hsla(210,54%,20%,.4),
-        0 1px 0 hsla(210,54%,20%,.2);
-    transition: none;
+  background-color: hsla(210,54%,20%,.15);
+  box-shadow: 0 1px 1px hsla(210,54%,20%,.1) inset,
+              0 0 1px var(--toolbarbutton-border-color) inset,
+              0 0 0 1px hsla(210,54%,20%,.4),
+              0 1px 0 var(--toolbarbutton-border-color);
+  transition: none;
 }
 
 @conditionalForwardWithUrlbar@ > #back-button[disabled] > .toolbarbutton-icon {
-    box-shadow: 0 0 0 1px hsla(210,54%,20%,.55),
-        0 1px 0 hsla(210,54%,20%,.65);
-    transition: none;
+  box-shadow: 0 0 0 1px hsla(210,54%,20%,.55),
+              0 1px 0 hsla(210,54%,20%,.65);
+  transition: none;
 }
 
 .unified-nav-back[_moz-menuactive]:-moz-locale-dir(ltr),
 .unified-nav-forward[_moz-menuactive]:-moz-locale-dir(rtl) {
-    list-style-image: url("chrome://browser/skin/menu-back.png") !important;
+  list-style-image: url("chrome://browser/skin/menu-back.png") !important;
 }
 
 .unified-nav-forward[_moz-menuactive]:-moz-locale-dir(ltr),
 .unified-nav-back[_moz-menuactive]:-moz-locale-dir(rtl) {
-    list-style-image: url("chrome://browser/skin/menu-forward.png") !important;
+  list-style-image: url("chrome://browser/skin/menu-forward.png") !important;
 }
 
 #stop-button {
-    -moz-image-region: rect(0, 54px, 18px, 36px);
+  -moz-image-region: rect(0, 54px, 18px, 36px);
 }
 
 #reload-button {
-    -moz-image-region: rect(0, 72px, 18px, 54px);
+  -moz-image-region: rect(0, 72px, 18px, 54px);
 }
 
 #home-button.bookmark-item {
-    list-style-image: url("chrome://browser/skin/Toolbar.png");
+  list-style-image: var(--toolbarbutton-image);
 }
+
 toolbar[brighttext] #home-button.bookmark-item {
-    list-style-image: url("chrome://browser/skin/Toolbar-inverted.png");
+  list-style-image: var(--toolbarbutton-inverted-image);
 }
 
 #home-button {
-    -moz-image-region: rect(0, 90px, 18px, 72px);
+  -moz-image-region: rect(0, 90px, 18px, 72px);
 }
 
 #downloads-button {
-    -moz-image-region: rect(0, 108px, 18px, 90px);
+  -moz-image-region: rect(0, 108px, 18px, 90px);
 }
 
 #history-button,
 #history-menu-button {
-    -moz-image-region: rect(0, 126px, 18px, 108px);
+  -moz-image-region: rect(0, 126px, 18px, 108px);
 }
 
 #bookmarks-button,
 #bookmarks-menu-button {
-    -moz-image-region: rect(0, 144px, 18px, 126px);
+  -moz-image-region: rect(0, 144px, 18px, 126px);
 }
 
 #bookmarks-menu-button.bookmark-item {
-    list-style-image: url("chrome://browser/skin/Toolbar.png");
+  list-style-image: var(--toolbarbutton-image);
 }
 
 toolbar[brighttext] #bookmarks-menu-button.bookmark-item {
-    list-style-image: url("chrome://browser/skin/Toolbar-inverted.png");
+  list-style-image: var(--toolbarbutton-inverted-image);
 }
 
 #print-button {
-    -moz-image-region: rect(0, 162px, 18px, 144px);
+  -moz-image-region: rect(0, 162px, 18px, 144px);
 }
 
 #new-tab-button {
-    -moz-image-region: rect(0, 180px, 18px, 162px);
+  -moz-image-region: rect(0, 180px, 18px, 162px);
 }
 
 #new-window-button {
-    -moz-image-region: rect(0, 198px, 18px, 180px);
+  -moz-image-region: rect(0, 198px, 18px, 180px);
 }
 
 #cut-button {
-    -moz-image-region: rect(0, 216px, 18px, 198px);
+  -moz-image-region: rect(0, 216px, 18px, 198px);
 }
 
 #copy-button {
-    -moz-image-region: rect(0, 234px, 18px, 216px);
+  -moz-image-region: rect(0, 234px, 18px, 216px);
 }
 
 #paste-button {
-    -moz-image-region: rect(0, 252px, 18px, 234px);
+  -moz-image-region: rect(0, 252px, 18px, 234px);
 }
 
 #fullscreen-button {
-    -moz-image-region: rect(0, 270px, 18px, 252px);
+  -moz-image-region: rect(0, 270px, 18px, 252px);
 }
 
 #zoom-out-button {
-    -moz-image-region: rect(0, 288px, 18px, 270px);
+  -moz-image-region: rect(0, 288px, 18px, 270px);
 }
 
 #zoom-in-button {
-    -moz-image-region: rect(0, 306px, 18px, 288px);
+  -moz-image-region: rect(0, 306px, 18px, 288px);
 }
 
 #sync-button {
-    -moz-image-region: rect(0, 324px, 18px, 306px);
+  -moz-image-region: rect(0, 324px, 18px, 306px);
 }
 #sync-button[status="active"] {
-    list-style-image: url("chrome://browser/skin/sync-throbber.png");
-    -moz-image-region: rect(0, 18px, 18px, 0);
+  list-style-image: url("chrome://browser/skin/sync-throbber.png");
+  -moz-image-region: rect(0, 18px, 18px, 0);
 }
 
 #feed-button {
-    -moz-image-region: rect(0, 342px, 18px, 324px);
+  -moz-image-region: rect(0, 342px, 18px, 324px);
 }
 
 %ifdef MOZ_WEBRTC
 #webrtc-status-button {
-    -moz-image-region: rect(0, 360px, 18px, 342px);
+  -moz-image-region: rect(0, 360px, 18px, 342px);
 }
 %endif
 
@@ -821,211 +890,211 @@ toolbar[brighttext] #bookmarks-menu-button.bookmark-item {
 
 #urlbar,
 .searchbar-textbox {
-    -moz-appearance: none;
-    margin: 1px 3px;
-    padding: 0;
-    background-clip: padding-box;
-    border: 1px solid ThreeDShadow;
-    border-radius: 2px;
+  -moz-appearance: none;
+  margin: 1px 3px;
+  padding: 0;
+  background-clip: padding-box;
+  border: 1px solid ThreeDShadow;
+  border-radius: 2px;
 }
 
 #urlbar {
-    width: 7em;
-    -moz-padding-end: 2px;
+  width: 7em;
+  padding-inline-end: 2px;
 }
 
 @media (-moz-mac-lion-theme) {
-    #urlbar,
-    .searchbar-textbox {
-        @navbarTextboxCustomBorder@
-    }
+  #urlbar,
+  .searchbar-textbox {
+    @navbarTextboxCustomBorder@
+  }
 }
 
 #urlbar:-moz-lwtheme,
 .searchbar-textbox:-moz-lwtheme {
-    background-color: rgba(255,255,255,.8);
-    @navbarTextboxCustomBorder@
-    color: black;
+  background-color: rgba(255,255,255,.8);
+  @navbarTextboxCustomBorder@
+  color: black;
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container {
-    padding-left: @conditionalForwardWithUrlbarWidth@px;
-    -moz-margin-start: -@conditionalForwardWithUrlbarWidth@px;
-    position: relative;
-    pointer-events: none;
+  padding-left: @conditionalForwardWithUrlbarWidth@px;
+  margin-inline-start: -@conditionalForwardWithUrlbarWidth@px;
+  position: relative;
+  pointer-events: none;
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar {
-    -moz-border-start: none;
-    margin-left: 0;
-    pointer-events: all;
+  border-inline-start: none;
+  margin-left: 0;
+  pointer-events: all;
 }
 
 @conditionalForwardWithUrlbar@:not([switchingtabs]) + #urlbar-container > #urlbar {
-    transition: margin-left @forwardTransitionLength@ ease-out;
+  transition: margin-left @forwardTransitionLength@ ease-out;
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar:-moz-locale-dir(ltr) {
-    border-top-left-radius: 0;
-    border-bottom-left-radius: 0;
+  border-top-left-radius: 0;
+  border-bottom-left-radius: 0;
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar:-moz-locale-dir(rtl) {
-    border-top-right-radius: 0;
-    border-bottom-right-radius: 0;
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
 }
 
 @conditionalForwardWithUrlbar@[forwarddisabled] + #urlbar-container {
-    clip-path: url("chrome://browser/content/browser.xul#windows-urlbar-back-button-clip-path");
+  clip-path: url("chrome://browser/content/browser.xul#windows-urlbar-back-button-clip-path");
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container:-moz-locale-dir(rtl),
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar:-moz-locale-dir(rtl) {
-    /* let windows-urlbar-back-button-mask clip the urlbar's right side for RTL */
-    transform: scaleX(-1);
+  /* let windows-urlbar-back-button-mask clip the urlbar's right side for RTL */
+  transform: scaleX(-1);
 }
 
 html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 .searchbar-textbox:-moz-lwtheme > .autocomplete-textbox-container > .textbox-input-box > html|*.textbox-input::-moz-placeholder {
-    opacity: 1.0;
-    color: #777;
+  opacity: 1.0;
+  color: #777;
 }
 
 #urlbar:-moz-lwtheme[focused="true"],
 .searchbar-textbox:-moz-lwtheme[focused="true"] {
-    background-color: white;
+  background-color: white;
 }
 
 #urlbar-container {
-    -moz-box-orient: horizontal;
-    -moz-box-align: stretch;
+  -moz-box-orient: horizontal;
+  -moz-box-align: stretch;
 }
 
 .urlbar-textbox-container {
-    -moz-box-align: stretch;
+  -moz-box-align: stretch;
 }
 
 .urlbar-input-box {
-    -moz-margin-start: 0;
-    min-width: 4em;
+  margin-inline-start: 0;
+  min-width: 4em;
 }
 
 #urlbar-icons {
-    -moz-box-align: center;
+  -moz-box-align: center;
 }
 
 .urlbar-icon {
-    padding: 0 3px;
+  padding: 0 3px;
 }
 
 .searchbar-engine-button,
 .search-go-container {
-    padding: 2px 2px;
+  padding: 2px 2px;
 }
 
 .urlbar-icon:hover {
-    background-image: radial-gradient(circle closest-side, hsla(200,100%,70%,.3), hsla(200,100%,70%,0));
+  background-image: radial-gradient(circle closest-side, hsla(200,100%,70%,.3), hsla(200,100%,70%,0));
 }
 
 .urlbar-icon[open="true"],
 .urlbar-icon:hover:active {
-    background-image: radial-gradient(circle closest-side, hsla(200,100%,70%,.1), hsla(200,100%,70%,0));
+  background-image: radial-gradient(circle closest-side, hsla(200,100%,70%,.1), hsla(200,100%,70%,0));
 }
 
 #urlbar-search-splitter {
-    min-width: 6px;
-    -moz-margin-start: -3px;
-    border: none;
-    background: transparent;
+  min-width: 6px;
+  margin-inline-start: -3px;
+  border: none;
+  background: transparent;
 }
 
 #urlbar-search-splitter + #urlbar-container > #urlbar ,
 #urlbar-search-splitter + #search-container > #searchbar > .searchbar-textbox {
-    -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #urlbar-display-box {
-    -moz-border-end: 1px solid #AAA;
-    -moz-margin-end: 3px;
+  border-inline-end: 1px solid #AAA;
+  margin-inline-end: 3px;
 }
 
 #urlbar-display {
-    margin-top: 0;
-    margin-bottom: 0;
-    -moz-margin-start: 0;
-    color: GrayText;
+  margin-top: 0;
+  margin-bottom: 0;
+  margin-inline-start: 0;
+  color: GrayText;
 }
 
 /* identity box */
 
 #identity-box {
-    padding: 2px;
-    font-size: .9em;
+  padding: 2px;
+  font-size: .9em;
 }
 
 #identity-box:-moz-locale-dir(ltr) {
-    border-top-left-radius: 1.5px;
-    border-bottom-left-radius: 1.5px;
+  border-top-left-radius: 1.5px;
+  border-bottom-left-radius: 1.5px;
 }
 
 #identity-box:-moz-locale-dir(rtl) {
-    border-top-right-radius: 1.5px;
-    border-bottom-right-radius: 1.5px;
+  border-top-right-radius: 1.5px;
+  border-bottom-right-radius: 1.5px;
 }
 
 #notification-popup-box:not([hidden]) + #identity-box {
-    -moz-padding-start: 10px;
-    border-radius: 0;
+  padding-inline-start: 10px;
+  border-radius: 0;
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar > #identity-box {
-    border-radius: 0;
+  border-radius: 0;
 }
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedIdentity {
-    color: hsl(92,100%,30%);
-    -moz-margin-end: 4px;
-    background-image: -moz-linear-gradient(hsla(92,81%,16%,0),
-        hsla(92,81%,16%,.08) 25%,
-        hsla(92,81%,16%,.08) 75%,
-        hsla(92,81%,16%,0));
-    background-position: right;
-    background-repeat: no-repeat; 
+  color: hsl(92,100%,30%);
+  margin-inline-end: 4px;
+  background-image: -moz-linear-gradient(hsla(92,81%,16%,0),
+    hsla(92,81%,16%,.08) 25%,
+    hsla(92,81%,16%,.08) 75%,
+    hsla(92,81%,16%,0));
+  background-position: right;
+  background-repeat: no-repeat; 
 }
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedDomain {
-    color: rgb(0,79,168);
-    -moz-margin-end: 4px;
-    background-image: -moz-linear-gradient(rgba(0,79,168,0),
-        rgba(0,79,168,.08) 25%,
-        rgba(0,79,168,.08) 75%,
-        rgba(0,79,168,0));
-    background-position: right;
-    background-repeat: no-repeat;
+  color: rgb(0,79,168);
+  margin-inline-end: 4px;
+  background-image: -moz-linear-gradient(rgba(0,79,168,0),
+    rgba(0,79,168,.08) 25%,
+    rgba(0,79,168,.08) 75%,
+    rgba(0,79,168,0));
+  background-position: right;
+  background-repeat: no-repeat;
 }
 
 #identity-box.verifiedIdentity:-moz-locale-dir(rtl) {
-    background-position: left;
+  background-position: left;
 }
 
 #identity-box.verifiedIdentity:not(:-moz-lwtheme) {
-    background-color: #fff;
-    box-shadow: inset 0 0 2px rgb(0,168,0);
+  background-color: #fff;
+  box-shadow: inset 0 0 2px rgb(0,168,0);
 }
 
 #identity-box.verifiedDomain:not(:-moz-lwtheme) {
-    background-color: rgb(224,234,247);
-    box-shadow: inset 0 0 2px rgb(0,79,168);
+  background-color: rgb(224,234,247);
+  box-shadow: inset 0 0 2px rgb(0,79,168);
 }
 
 #identity-box:-moz-focusring {
-    outline: 1px dotted #000;
-    outline-offset: -3px;
+  outline: 1px dotted #000;
+  outline-offset: -3px;
 }
 
 #identity-icon-labels {
-    -moz-padding-start: 2px;
-    -moz-padding-end: 5px;
+  padding-inline-start: 2px;
+  padding-inline-end: 5px;
 }
 
 /* Address bar shading for SSL */
@@ -1062,282 +1131,282 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 /* Location bar dropmarker */
 
 .urlbar-history-dropmarker {
-    -moz-appearance: none;
-    padding: 0 3px;
-    background-color: transparent;
-    border: none;
-    width: auto;
-    list-style-image: url("chrome://browser/skin/urlbar-history-dropmarker.png");
-    -moz-image-region: rect(0px, 11px, 14px, 0px);
+  -moz-appearance: none;
+  padding: 0 3px;
+  background-color: transparent;
+  border: none;
+  width: auto;
+  list-style-image: url("chrome://browser/skin/urlbar-history-dropmarker.png");
+  -moz-image-region: rect(0px, 11px, 14px, 0px);
 }
 
 .urlbar-history-dropmarker:hover {
-    background-image: radial-gradient(circle closest-side, hsla(205,100%,70%,.3), hsla(205,100%,70%,0));
-    -moz-image-region: rect(0px, 22px, 14px, 11px);
+  background-image: radial-gradient(circle closest-side, hsla(205,100%,70%,.3), hsla(205,100%,70%,0));
+  -moz-image-region: rect(0px, 22px, 14px, 11px);
 }
 
 .urlbar-history-dropmarker:hover:active,
 .urlbar-history-dropmarker[open="true"] {
-    background-image: radial-gradient(circle closest-side, hsla(205,100%,70%,.1), hsla(205,100%,70%,0));
-    -moz-image-region: rect(0px, 33px, 14px, 22px);
+  background-image: radial-gradient(circle closest-side, hsla(205,100%,70%,.1), hsla(205,100%,70%,0));
+  -moz-image-region: rect(0px, 33px, 14px, 22px);
 }
 
 /* page proxy icon */
 
 #page-proxy-favicon {
-    width: 16px;
-    height: 16px;
-    margin-top: 1px;
-    margin-bottom: 1px;
-    -moz-margin-start: 3px;
-    -moz-margin-end: 2px;
-    list-style-image: url(chrome://browser/skin/identity-icons-generic.png);
-    -moz-image-region: rect(0, 16px, 16px, 0);
+  width: 16px;
+  height: 16px;
+  margin-top: 1px;
+  margin-bottom: 1px;
+  margin-inline-start: 3px;
+  margin-inline-end: 2px;
+  list-style-image: url(chrome://browser/skin/identity-icons-generic.png);
+  -moz-image-region: rect(0, 16px, 16px, 0);
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar > #identity-box > #page-proxy-favicon {
-    -moz-margin-end: 1px;
+  margin-inline-end: 1px;
 }
 
 /* Since we already have a padlock, always use the generic icon until the favicon loads
 .verifiedDomain > #page-proxy-favicon[pageproxystate="valid"] {
-    list-style-image: url(chrome://browser/skin/identity-icons-https.png);
+  list-style-image: url(chrome://browser/skin/identity-icons-https.png);
 }
 
 .verifiedIdentity > #page-proxy-favicon[pageproxystate="valid"] {
-    list-style-image: url(chrome://browser/skin/identity-icons-https-ev.png);
+  list-style-image: url(chrome://browser/skin/identity-icons-https-ev.png);
 }
 
 .mixedActiveContent > #page-proxy-favicon[pageproxystate="valid"] {
-    list-style-image: url(chrome://browser/skin/identity-icons-https-mixed-active.png);
+  list-style-image: url(chrome://browser/skin/identity-icons-https-mixed-active.png);
 }
 */
 
 #identity-box:hover > #page-proxy-favicon {
-    -moz-image-region: rect(0, 32px, 16px, 16px);
+  -moz-image-region: rect(0, 32px, 16px, 16px);
 }
 
 #identity-box:hover:active > #page-proxy-favicon,
 #identity-box[open=true] > #page-proxy-favicon {
-    -moz-image-region: rect(0, 48px, 16px, 32px);
+  -moz-image-region: rect(0, 48px, 16px, 32px);
 }
 
 #page-proxy-favicon[pageproxystate="invalid"] {
-    opacity: 0.3;
+  opacity: 0.3;
 }
 
 /* autocomplete */
 
 #treecolAutoCompleteImage {
-    max-width: 36px;
+  max-width: 36px;
 }
 
 .ac-result-type-bookmark,
 .autocomplete-treebody::-moz-tree-image(bookmark, treecolAutoCompleteImage) {
-    list-style-image: url("chrome://browser/skin/places/bookmark.png");
-    -moz-image-region: rect(0px 48px 16px 32px);
-    width: 16px;
-    height: 16px;
+  list-style-image: url("chrome://browser/skin/places/bookmark.png");
+  -moz-image-region: rect(0px 48px 16px 32px);
+  width: 16px;
+  height: 16px;
 }
 
 .ac-result-type-keyword,
 .autocomplete-treebody::-moz-tree-image(keyword, treecolAutoCompleteImage) {
-    list-style-image: url(chrome://global/skin/icons/search-textbox.png);
-    margin: 2px;
-    width: 12px;
-    height: 12px;
+  list-style-image: url(chrome://global/skin/icons/search-textbox.png);
+  margin: 2px;
+  width: 12px;
+  height: 12px;
 }
 
 .ac-result-type-tag,
 .autocomplete-treebody::-moz-tree-image(tag, treecolAutoCompleteImage) {
-    list-style-image: url("chrome://browser/skin/places/tag.png");
-    width: 16px;
-    height: 16px;
+  list-style-image: url("chrome://browser/skin/places/tag.png");
+  width: 16px;
+  height: 16px;
 }
 
 .ac-comment {
-    font-size: 1.06em;
+  font-size: 1.06em;
 }
 
 .ac-extra > .ac-comment {
-    font-size: 1em;
+  font-size: 1em;
 }
 
 .ac-url-text,
 .ac-action-text {
-    font-size: 1em;
-    color: -moz-nativehyperlinktext;
+  font-size: 1em;
+  color: -moz-nativehyperlinktext;
 }
 
 @media (-moz-mac-lion-theme) {
-    .ac-url-text:not([selected="true"]),
-    .ac-action-text:not([selected="true"]) {
-        color: #008800;
-    }
+  .ac-url-text:not([selected="true"]),
+  .ac-action-text:not([selected="true"]) {
+    color: #008800;
+  }
 }
 
 richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-icon {
-    list-style-image: url("chrome://browser/skin/actionicon-tab.png");
-    -moz-image-region: rect(0, 16px, 11px, 0);
-    padding: 0 3px;
+  list-style-image: url("chrome://browser/skin/actionicon-tab.png");
+  -moz-image-region: rect(0, 16px, 11px, 0);
+  padding: 0 3px;
 }
 
 richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-box > .ac-action-icon {
-    -moz-image-region: rect(11px, 16px, 22px, 0);
+  -moz-image-region: rect(11px, 16px, 22px, 0);
 }
 
 .ac-comment[selected="true"],
 .ac-url-text[selected="true"],
 .ac-action-text[selected="true"] {
-    color: inherit !important;
+  color: inherit !important;
 }
 
 .autocomplete-treebody::-moz-tree-cell-text(treecolAutoCompleteComment) {
-    color: GrayText;
+  color: GrayText;
 }
 
 .autocomplete-treebody::-moz-tree-cell-text(suggesthint, treecolAutoCompleteComment),
 .autocomplete-treebody::-moz-tree-cell-text(suggestfirst, treecolAutoCompleteComment)
 {
-    color: GrayText;
-    font-size: smaller;
+  color: GrayText;
+  font-size: smaller;
 }
 
 .autocomplete-treebody::-moz-tree-cell(suggesthint) {
-    border-top: 1px solid GrayText;
+  border-top: 1px solid GrayText;
 }
 
 /* combined go/reload/stop button in location bar */
 
 #go-button,
 #urlbar > toolbarbutton {
-    -moz-appearance: none;
-    padding: 0 2px;
-    background-origin: border-box;
-    border: none;
-    list-style-image: url("chrome://browser/skin/reload-stop-go.png");
+  -moz-appearance: none;
+  padding: 0 2px;
+  background-origin: border-box;
+  border: none;
+  list-style-image: url("chrome://browser/skin/reload-stop-go.png");
 }
 
 #go-button {
-    padding: 0 3px;
+  padding: 0 3px;
 }
 
 #urlbar-reload-button {
-    -moz-image-region: rect(0, 14px, 14px, 0);
+  -moz-image-region: rect(0, 14px, 14px, 0);
 }
 
 #urlbar-reload-button:not([disabled]):hover {
-    background-image: radial-gradient(circle closest-side, hsla(200,100%,70%,.2), hsla(200,100%,70%,0));
-    -moz-image-region: rect(14px, 14px, 28px, 0);
+  background-image: radial-gradient(circle closest-side, hsla(200,100%,70%,.2), hsla(200,100%,70%,0));
+  -moz-image-region: rect(14px, 14px, 28px, 0);
 }
 
 #urlbar-reload-button:not([disabled]):hover:active {
-    background-image: radial-gradient(circle closest-side, hsla(200,100%,60%,.1), hsla(200,100%,60%,0));
-    -moz-image-region: rect(28px, 14px, 42px, 0);
+  background-image: radial-gradient(circle closest-side, hsla(200,100%,60%,.1), hsla(200,100%,60%,0));
+  -moz-image-region: rect(28px, 14px, 42px, 0);
 }
 
 #urlbar-reload-button:-moz-locale-dir(rtl) > .toolbarbutton-icon {
-    transform: scaleX(-1);
+  transform: scaleX(-1);
 }
 
 #go-button,
 #urlbar-go-button {
-    -moz-image-region: rect(0, 42px, 14px, 28px);
+  -moz-image-region: rect(0, 42px, 14px, 28px);
 }
 
 #go-button:hover,
 #urlbar-go-button:hover {
-    background-image: radial-gradient(circle closest-side, hsla(110,70%,50%,.2), hsla(110,70%,50%,0));
-    -moz-image-region: rect(14px, 42px, 28px, 28px);
+  background-image: radial-gradient(circle closest-side, hsla(110,70%,50%,.2), hsla(110,70%,50%,0));
+  -moz-image-region: rect(14px, 42px, 28px, 28px);
 }
 
 #go-button:hover:active,
 #urlbar-go-button:hover:active {
-    background-image: radial-gradient(circle closest-side, hsla(110,70%,50%,.1), hsla(110,70%,50%,0));
-    -moz-image-region: rect(28px, 42px, 42px, 28px);
+  background-image: radial-gradient(circle closest-side, hsla(110,70%,50%,.1), hsla(110,70%,50%,0));
+  -moz-image-region: rect(28px, 42px, 42px, 28px);
 }
 
 #go-button:-moz-locale-dir(rtl) > .toolbarbutton-icon,
 #urlbar-go-button:-moz-locale-dir(rtl) > .toolbarbutton-icon {
-    transform: scaleX(-1);
+  transform: scaleX(-1);
 }
 
 #urlbar-stop-button {
-    -moz-image-region: rect(0, 28px, 14px, 14px);
+  -moz-image-region: rect(0, 28px, 14px, 14px);
 }
 
 #urlbar-stop-button:not([disabled]):hover {
-    background-image: radial-gradient(circle closest-side, hsla(5,100%,75%,.3), hsla(5,100%,75%,0));
-    -moz-image-region: rect(14px, 28px, 28px, 14px);
+  background-image: radial-gradient(circle closest-side, hsla(5,100%,75%,.3), hsla(5,100%,75%,0));
+  -moz-image-region: rect(14px, 28px, 28px, 14px);
 }
 
 #urlbar-stop-button:hover:active {
-    background-image: radial-gradient(circle closest-side, hsla(5,100%,75%,.1), hsla(5,100%,75%,0));
-    -moz-image-region: rect(28px, 28px, 42px, 14px);
+  background-image: radial-gradient(circle closest-side, hsla(5,100%,75%,.1), hsla(5,100%,75%,0));
+  -moz-image-region: rect(28px, 28px, 42px, 14px);
 }
 
 /* popup blocker button */
 
 #page-report-button {
-    list-style-image: url("chrome://browser/skin/urlbar-popup-blocked.png");
-    -moz-image-region: rect(0, 16px, 16px, 0);
+  list-style-image: url("chrome://browser/skin/urlbar-popup-blocked.png");
+  -moz-image-region: rect(0, 16px, 16px, 0);
 }
 
 #page-report-button:hover {
-    -moz-image-region: rect(0, 32px, 16px, 16px);
+  -moz-image-region: rect(0, 32px, 16px, 16px);
 }
 
 #page-report-button:hover:active,
 #page-report-button[open="true"] {
-    -moz-image-region: rect(0, 48px, 16px, 32px);
+  -moz-image-region: rect(0, 48px, 16px, 32px);
 }
 
 
 /* star button */
 
 #star-button {
-    list-style-image: url("chrome://browser/skin/places/bookmark.png");
-    -moz-image-region: rect(0px 16px 16px 0px);
+  list-style-image: url("chrome://browser/skin/places/bookmark.png");
+  -moz-image-region: rect(0px 16px 16px 0px);
 }
 
 #star-button:hover {
-    background-image: radial-gradient(circle closest-side, hsla(45,100%,73%,.3), hsla(45,100%,73%,0));
-    -moz-image-region: rect(0px 32px 16px 16px);
+  background-image: radial-gradient(circle closest-side, hsla(45,100%,73%,.3), hsla(45,100%,73%,0));
+  -moz-image-region: rect(0px 32px 16px 16px);
 }
 
 #star-button:hover:active {
-    background-image: radial-gradient(circle closest-side, hsla(45,100%,73%,.1), hsla(45,100%,73%,0));
-    -moz-image-region: rect(0px 48px 16px 32px);
+  background-image: radial-gradient(circle closest-side, hsla(45,100%,73%,.1), hsla(45,100%,73%,0));
+  -moz-image-region: rect(0px 48px 16px 32px);
 }
 
 #star-button[starred] {
-    list-style-image: url("chrome://browser/skin/places/editBookmark.png");
+  list-style-image: url("chrome://browser/skin/places/editBookmark.png");
 }
 
 /* bookmarking panel */
 
 #editBookmarkPanelStarIcon {
-    list-style-image: url("chrome://browser/skin/places/starred48.png");
-    width: 48px;
-    height: 48px;
+  list-style-image: url("chrome://browser/skin/places/starred48.png");
+  width: 48px;
+  height: 48px;
 }
 
 #editBookmarkPanelStarIcon[unstarred] {
-    list-style-image: url("chrome://browser/skin/places/unstarred48.png");
+  list-style-image: url("chrome://browser/skin/places/unstarred48.png");
 }
 
 #editBookmarkPanelTitle {
-    font-size: 130%;
+  font-size: 130%;
 }
 
 #editBookmarkPanelHeader,
 #editBookmarkPanelContent {
-    margin-bottom: .5em;
+  margin-bottom: .5em;
 }
 
 /* Implements editBookmarkPanel resizing on folderTree un-collapse. */
 #editBMPanel_folderTree {
-    min-width: 27em;
+  min-width: 27em;
 }
 
 /* BOOKMARKING PANEL */
@@ -1374,7 +1443,7 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
   border-radius: 3px;
   border: 1px solid rgba(0,0,0,.3) !important;
   box-shadow: inset 0 1px 1px 1px rgba(0,0,0,.05),
-              0 1px rgba(255,255,255,.3);
+        0 1px rgba(255,255,255,.3);
   margin: 0;
   padding: 3px 6px;
 }
@@ -1414,7 +1483,7 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 }
 
 .editBookmarkPanelBottomButton:last-child {
-  -moz-margin-start: 8px;
+  margin-inline-start: 8px;
 }
 
 /* The following elements come from editBookmarkOverlay.xul. Styling that's
@@ -1429,8 +1498,8 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
   border-radius: 0 0 3px 3px;
   border: 1px solid #a5a5a5;
   box-shadow: inset 0 1px rgba(255,255,255,.8),
-              inset 0 0 1px rgba(255,255, 255,.25),
-              0 1px rgba(255,255,255,.3);
+        inset 0 0 1px rgba(255,255, 255,.25),
+        0 1px rgba(255,255,255,.3);
   margin: 0;
   padding: 0;
   height:  20px;
@@ -1439,7 +1508,7 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 #editBMPanel_newFolderButton {
   -moz-appearance: none;
   border: 0 solid #a5a5a5;
-  -moz-border-end-width: 1px;
+  border-inline-end-width: 1px;
   padding: 0 9px;
   margin: 0;
   min-width: 21px;
@@ -1470,8 +1539,8 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
   min-height: 22px;
   padding-top: 2px;
   padding-bottom: 1px;
-  -moz-padding-start: 8px;
-  -moz-padding-end: 4px;
+  padding-inline-start: 8px;
+  padding-inline-end: 4px;
 }
 
 #editBMPanel_folderMenuList:-moz-focusring {
@@ -1490,7 +1559,7 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
   border: 0;
   margin: 0;
   padding: 0;
-  -moz-padding-end: 4px;
+  padding-inline-end: 4px;
   width: 7px;
 }
 
@@ -1508,7 +1577,7 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
   border-radius: 3px;
   border: 1px solid rgba(0,0,0,.3);
   box-shadow: inset 0 1px 1px 1px rgba(0,0,0,.05),
-              0 1px rgba(255,255,255,.3);
+        0 1px rgba(255,255,255,.3);
   margin: 0;
 }
 
@@ -1534,7 +1603,7 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 #editBookmarkPanel .expander-down {
   @hudButton@
   margin: 0;
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   min-width: 27px;
   min-height: 22px;
 }
@@ -1569,16 +1638,16 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 
 @media (min-resolution: 2dppx) {
   #editBookmarkPanel .expander-up {
-    list-style-image: url("chrome://browser/skin/panel-expander-open@2x.png");
+  list-style-image: url("chrome://browser/skin/panel-expander-open@2x.png");
   }
 
   #editBookmarkPanel .expander-down {
-    list-style-image: url("chrome://browser/skin/panel-expander-closed@2x.png");
+  list-style-image: url("chrome://browser/skin/panel-expander-closed@2x.png");
   }
 
   #editBookmarkPanel .expander-up > .button-box > .button-icon,
   #editBookmarkPanel .expander-down > .button-box > .button-icon {
-    width: 9px;
+  width: 9px;
   }
 }
 
@@ -1594,40 +1663,40 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 /* ::::: content area ::::: */
 
 #sidebar {
-    background-color: Window;
+  background-color: Window;
 }
 
 #sidebar-title {
-    -moz-padding-start: 0px;
+  padding-inline-start: 0px;
 }
 
 /* ::::: throbber ::::: */
 
 #navigator-throbber {
-    width: 16px;
-    min-height: 16px;
-    margin: 0 3px;
+  width: 16px;
+  min-height: 16px;
+  margin: 0 3px;
 }
 
 #navigator-throbber[busy="true"] {
-    list-style-image: url("chrome://global/skin/icons/loading_16.png");
+  list-style-image: url("chrome://global/skin/icons/loading_16.png");
 }
 
 #navigator-throbber,
 #wrapper-navigator-throbber > #navigator-throbber {
-    list-style-image: url("chrome://global/skin/icons/notloading_16.png");
+  list-style-image: url("chrome://global/skin/icons/notloading_16.png");
 }
 
 /* Tabstrip */
 
 #TabsToolbar {
-    min-height: 0;
-    padding: 0;
+  min-height: 0;
+  padding: 0;
 }
 
 #TabsToolbar:not(:-moz-lwtheme),
 #TabsToolbar[tabsontop=false] {
-    background-image: linear-gradient(to top, @toolbarShadowColor@ 1px, rgba(0,0,0,.05) 1px, transparent 50%);
+  background-image: linear-gradient(to top, @toolbarShadowColor@ 1px, rgba(0,0,0,.05) 1px, transparent 50%);
 }
 
 /* When the tab bar is collapsed, show a 1px border in its place. */
@@ -1642,50 +1711,50 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 }
 
 @media (-moz-mac-lion-theme) {
-    #main-window[sizemode=normal] #TabsToolbar {
-        padding-left: 2px;
-        padding-right: 2px;
-    }
+  #main-window[sizemode=normal] #TabsToolbar {
+    padding-left: 2px;
+    padding-right: 2px;
+  }
 }
 
 /* remove 5 pixel border on left and right of browser screen */
 .tabbrowser-tabbox {
-    margin: 0;
+  margin: 0;
 }
 
 .tabbrowser-tab,
 .tabs-newtab-button {
-    -moz-appearance: none;
-    background: @toolbarShadowOnTab@, @bgTabTexture@,
-        linear-gradient(-moz-dialog, -moz-dialog);
-    background-clip: padding-box;
-    padding: 3px 1px 4px;
-    /* Setting a transparent outer border allows us to have a 1px gap
-       between the tabs and the top edge of the screen, even when the
-       tabs have a top margin of 0, which is important for Fitts' law
-       compliance */
-    border: 2px solid;
-    border-bottom: none;
-    border-radius: 6px 6px 0px 0px;
-    -moz-border-top-colors: transparent #929292;
-    -moz-border-left-colors: transparent #929292;
-    -moz-border-right-colors: transparent #929292;
-    /* Hide the transparent top border by default */
-    margin-top: -1px;
-    /* Reduce the gap between the tabs */
-    -moz-margin-start: -1px;
-    box-shadow: inset 0.5px 1px 1px rgba(255,255,255,.7);
+  -moz-appearance: none;
+  background: @toolbarShadowOnTab@, var(--tab-background),
+              linear-gradient(var(--toolbar-custom-color), var(--toolbar-custom-color));
+  background-clip: padding-box;
+  padding: 3px 1px 4px;
+  /* Setting a transparent outer border allows us to have a 1px gap
+     between the tabs and the top edge of the screen, even when the
+     tabs have a top margin of 0, which is important for Fitts' law
+     compliance */
+  border: 1.6px solid;
+  border-bottom: none;
+  border-radius: var(--tab-border-radius) var(--tab-border-radius) 0px 0px;
+  -moz-border-top-colors: transparent #929292;
+  -moz-border-left-colors: transparent #929292;
+  -moz-border-right-colors: transparent #929292;
+  /* Hide the transparent top border by default */
+  margin-top: -1px;
+  /* Reduce the gap between the tabs */
+  margin-inline-start: -1px;
+  box-shadow: var(--tab-box-shadow);
 }
 
 .tabbrowser-tab {
-    -moz-padding-end: 3px;
+  padding-inline-end: 3px;
 }
 
 /* Override the default (globally-set) tab width values; increase
    by 2px to compensate for the transparent outer border of the tabs */
 .tabbrowser-tab:not([pinned]) {
-    max-width: 252px;
-    min-width: 102px;
+  max-width: 252px;
+  min-width: 102px;
 }
 
 /* When the tabs are on top and the window is maximized or in full-
@@ -1695,32 +1764,24 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 #main-window[sizemode="maximized"][tabsontop=true] .tabs-newtab-button,
 #main-window[sizemode="fullscreen"][tabsontop=true] .tabbrowser-tab,
 #main-window[sizemode="fullscreen"][tabsontop=true] .tabs-newtab-button {
-    margin-top: 0px;
-}
-
-/* make the tab text colors match those of the Windows client */
-@media (-moz-mac-lion-theme) {
-    tab {
-        text-shadow: none;
-        color: black !important;
-    }
+  margin-top: 0px;
 }
 
 .tabbrowser-tab:hover,
 .tabs-newtab-button:hover {
-    background-image: @toolbarShadowOnTab@, @bgTabTextureHover@,
-        linear-gradient(-moz-dialog, -moz-dialog);
+  background-image: @toolbarShadowOnTab@, var(--tab-background-hover),
+                    linear-gradient(var(--toolbar-custom-color), var(--toolbar-custom-color));
 }
 
 .tabbrowser-tab[selected="true"] {
-    background-image: linear-gradient(@selectedTabHighlight@, @toolbarHighlight@ 50%),
-        linear-gradient(-moz-dialog, -moz-dialog);
+  background-image: linear-gradient(var(--tab-selected-highlight), var(--toolbar-highlight-top) 50%),
+                    linear-gradient(var(--toolbar-custom-color), var(--toolbar-custom-color));
 }
 
 #main-window[tabsontop=false]:not([disablechrome]) .tabbrowser-tab[selected=true]:not(:-moz-lwtheme) {
-    background-image: @toolbarShadowOnTab@,
-        linear-gradient(@selectedTabHighlight@, @toolbarHighlight@ 50%),
-        linear-gradient(-moz-dialog, -moz-dialog);
+  background-image: @toolbarShadowOnTab@,
+                    linear-gradient(var(--tab-selected-highlight), var(--toolbar-highlight-top) 50%),
+                    linear-gradient(var(--toolbar-custom-color), var(--toolbar-custom-color));
 }
 
 .tabbrowser-tab[visuallyselected=true]:not(:-moz-lwtheme) {
@@ -1736,105 +1797,105 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 /* Remove highlight fuzz on dark themes */
 .tabbrowser-tab:-moz-lwtheme-brighttext,
 .tabs-newtab-button:-moz-lwtheme-brighttext {
-    box-shadow:none;
-    -moz-border-top-colors: transparent #707070;
-    -moz-border-left-colors: transparent #707070;
-    -moz-border-right-colors: transparent #707070;
+  box-shadow:none;
+  -moz-border-top-colors: transparent #707070;
+  -moz-border-left-colors: transparent #707070;
+  -moz-border-right-colors: transparent #707070;
 }
 
 .tabbrowser-tab[selected="true"]:-moz-lwtheme {
-    background-image: linear-gradient(rgba(255,255,255,.6), rgba(255,255,255,.8) 50%);
+  background-image: linear-gradient(var(--tab-selected-highlight), var(--toolbar-highlight-top) 50%);
 }
 
 .tabbrowser-tab[selected="true"]:-moz-lwtheme-brighttext {
-    background-image: linear-gradient(rgba(128,128,128,.9), rgba(32,32,32,.9) 50%, rgba(32,32,32,.9) 80%, rgba(32,32,32,.8) 100%);
-    -moz-border-top-colors: transparent #D0D0D0;
-    -moz-border-left-colors: transparent #D0D0D0;
-    -moz-border-right-colors: transparent #D0D0D0;
+  background-image: linear-gradient(rgba(128,128,128,.9), rgba(32,32,32,.9) 50%, rgba(32,32,32,.9) 80%, var(--toolbar-highlight-top) 100%);
+  -moz-border-top-colors: transparent #D0D0D0;
+  -moz-border-left-colors: transparent #D0D0D0;
+  -moz-border-right-colors: transparent #D0D0D0;
 }
 
 .tabbrowser-tab:-moz-lwtheme-brighttext:not([selected="true"]),
 .tabs-newtab-button:-moz-lwtheme-brighttext {
-    background-image: linear-gradient(hsla(0,0%,25%,.4), hsla(0,0%,15%,.6) 80%);
+  background-image: linear-gradient(hsla(0,0%,25%,.4), hsla(0,0%,15%,.6) 80%);
 }
 
 .tabbrowser-tab:-moz-lwtheme-brighttext:not([selected="true"]):hover,
 .tabs-newtab-button:-moz-lwtheme-brighttext:hover {
-    background-image: linear-gradient(hsla(0,0%,60%,.4), hsla(0,0%,10%,.8) 80%);
+  background-image: linear-gradient(hsla(0,0%,60%,.4), hsla(0,0%,10%,.8) 80%);
 }
 
 .tabbrowser-tab:-moz-lwtheme-darktext:not([selected="true"]),
 .tabs-newtab-button:-moz-lwtheme-darktext {
-    background-image: linear-gradient(hsla(0,0%,75%,.4), hsla(0,0%,85%,.6) 80%);
+  background-image: linear-gradient(hsla(0,0%,75%,.4), hsla(0,0%,85%,.6) 80%);
 }
 
 .tabbrowser-tab:-moz-lwtheme-darktext:not([selected="true"]):hover,
 .tabs-newtab-button:-moz-lwtheme-darktext:hover {
-    background-image: linear-gradient(hsla(0,0%,60%,.4), hsla(0,0%,90%,.8) 80%);
+  background-image: linear-gradient(hsla(0,0%,60%,.4), hsla(0,0%,90%,.8) 80%);
 }
 
 .tabbrowser-tab[pinned][titlechanged]:not([selected="true"]) {
-    background-image: radial-gradient(circle farthest-corner at 50% 3px, rgba(255,255,255,1) 3%, rgba(186,221,251,.75) 40%, rgba(127,179,255,.5) 80%, rgba(127,179,255,.25));
+  background-image: radial-gradient(circle farthest-corner at 50% 3px, rgba(255,255,255,1) 3%, rgba(186,221,251,.75) 40%, rgba(127,179,255,.5) 80%, rgba(127,179,255,.25));
 }
 .tabbrowser-tab[pinned][titlechanged]:not([selected="true"]):hover {
-    background-image: linear-gradient(hsla(0,0%,100%,.4), hsla(0,0%,75%,.4) 80%),
-        radial-gradient(circle farthest-corner at 50% 3px, rgba(255,255,255,1) 3%, rgba(186,221,251,.75) 40%, rgba(127,179,255,.5) 80%, rgba(127,179,255,.25));
+  background-image: linear-gradient(hsla(0,0%,100%,.4), hsla(0,0%,75%,.4) 80%),
+    radial-gradient(circle farthest-corner at 50% 3px, rgba(255,255,255,1) 3%, rgba(186,221,251,.75) 40%, rgba(127,179,255,.5) 80%, rgba(127,179,255,.25));
 }
 
 .tab-throbber,
 .tab-icon-image {
-    width: 16px;
-    height: 16px;
-    list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
-    -moz-margin-start: 2px;
-    -moz-margin-end: 3px;
+  width: 16px;
+  height: 16px;
+  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
+  margin-inline-start: 2px;
+  margin-inline-end: 3px;
 }
 
 .tab-throbber {
-    list-style-image: url("chrome://browser/skin/tabbrowser/connecting.png");
+  list-style-image: url("chrome://browser/skin/tabbrowser/connecting.png");
 }
 
 .tab-throbber[progress] {
-    list-style-image: url("chrome://browser/skin/tabbrowser/loading.png");
+  list-style-image: url("chrome://browser/skin/tabbrowser/loading.png");
 }
 
 .tab-throbber[pinned],
 .tab-icon-image[pinned] {
-    -moz-margin-start: 5px;
-    -moz-margin-end: 5px;
+  margin-inline-start: 5px;
+  margin-inline-end: 5px;
 }
 
 /* tabbrowser-tab focus ring */
 .tabbrowser-tab:focus > .tab-stack {
-    outline: 1px dotted;
+  outline: 1px dotted;
 }
 
 /* Tab DnD indicator */
 .tab-drop-indicator {
-    list-style-image: url(chrome://browser/skin/tabbrowser/tabDragIndicator.png);
-    margin-bottom: -11px;
+  list-style-image: url(chrome://browser/skin/tabbrowser/tabDragIndicator.png);
+  margin-bottom: -11px;
 }
 
 /* Tab close button */
 .tab-close-button {
-    -moz-appearance: none;
-    border: none;
-    padding: 0px;
+  -moz-appearance: none;
+  border: none;
+  padding: 0px;
 }
 
 .tab-close-button:-moz-lwtheme-brighttext {
-    list-style-image: url("chrome://global/skin/icons/close-inverted.png");
+  list-style-image: url("chrome://global/skin/icons/close-inverted.png");
 }
 
 @media (min-resolution: 2dppx) {
-    .tab-close-button:-moz-lwtheme-brighttext {
-        list-style-image: url("chrome://global/skin/icons/close-inverted@2x.png");
-    }
+  .tab-close-button:-moz-lwtheme-brighttext {
+    list-style-image: url("chrome://global/skin/icons/close-inverted@2x.png");
+  }
 }
   
 /* Tab sound indicator */
 .tab-icon-sound {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   width: 16px;
   height: 16px;
   padding: 0;
@@ -1920,280 +1981,280 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up,
 .tabbrowser-arrowscrollbox > .scrollbutton-down {
-    list-style-image: url("chrome://browser/skin/tabbrowser/tab-arrow-left.png");
-    margin: 0;
-    padding-right: 2px;
-    border-right: 2px solid transparent;
-    background-origin: border-box;
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-arrow-left.png");
+  margin: 0;
+  padding-right: 2px;
+  border-right: 2px solid transparent;
+  background-origin: border-box;
 }
 
 toolbar[brighttext] .tabbrowser-arrowscrollbox > .scrollbutton-up,
 toolbar[brighttext] .tabbrowser-arrowscrollbox > .scrollbutton-down {
-    list-style-image: url(chrome://browser/skin/tabbrowser/tab-arrow-left-inverted.png);
+  list-style-image: url(chrome://browser/skin/tabbrowser/tab-arrow-left-inverted.png);
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up[disabled],
 .tabbrowser-arrowscrollbox > .scrollbutton-down[disabled] {
-    opacity: .4;
+  opacity: .4;
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up:-moz-locale-dir(rtl),
 .tabbrowser-arrowscrollbox > .scrollbutton-down:-moz-locale-dir(ltr) {
-    transform: scaleX(-1);
+  transform: scaleX(-1);
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-down {
-    transition: 1s background-color ease-out;
+  transition: 1s background-color ease-out;
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-down[notifybgtab] {
-    background-color: Highlight;
-    transition: none;
+  background-color: Highlight;
+  transition: none;
 }
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up:not([disabled]),
 .tabbrowser-arrowscrollbox > .scrollbutton-down:not([disabled]) {
-    border-width: 0 2px 0 0;
-    border-style: solid;
-    border-image: url("chrome://browser/skin/tabbrowser/tab-overflow-border.png") 0 2 0 2 fill;
+  border-width: 0 2px 0 0;
+  border-style: solid;
+  border-image: url("chrome://browser/skin/tabbrowser/tab-overflow-border.png") 0 2 0 2 fill;
 }
 
 .tabs-newtab-button > .toolbarbutton-icon {
-    margin-top: -1px;
-    margin-bottom: -1px;
+  margin-top: -1px;
+  margin-bottom: -1px;
 }
 
 .tabs-newtab-button,
 #TabsToolbar > #new-tab-button,
 #TabsToolbar > toolbarpaletteitem > #new-tab-button {
-    list-style-image: url(chrome://browser/skin/tabbrowser/newtab.png);
-    -moz-image-region: auto;
+  list-style-image: url(chrome://browser/skin/tabbrowser/newtab.png);
+  -moz-image-region: auto;
 }
 
 .tabs-newtab-button:-moz-lwtheme-brighttext,
 toolbar[brighttext] #TabsToolbar > #new-tab-button,
 toolbar[brighttext] #TabsToolbar > toolbarpaletteitem > #new-tab-button {
-    list-style-image: url(chrome://browser/skin/tabbrowser/newtab-inverted.png);
+  list-style-image: url(chrome://browser/skin/tabbrowser/newtab-inverted.png);
 }
 
 .tabs-newtab-button {
-    width: 28px;
+  width: 28px;
 }
 
 #TabsToolbar > #new-tab-button {
-    width: 26px;
+  width: 26px;
 }
 
 #alltabs-button {
-    list-style-image: url("chrome://browser/skin/tabbrowser/alltabs.png");
-    -moz-image-region: rect(0, 14px, 16px, 0);
+  list-style-image: url("chrome://browser/skin/tabbrowser/alltabs.png");
+  -moz-image-region: rect(0, 14px, 16px, 0);
 }
 
 #alltabs-button[type="menu"] {
-    list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow.png");
-    -moz-image-region: auto;
+  list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow.png");
+  -moz-image-region: auto;
 }
 
 toolbar[brighttext] #alltabs-button {
-    list-style-image: url("chrome://browser/skin/tabbrowser/alltabs-inverted.png");
+  list-style-image: url("chrome://browser/skin/tabbrowser/alltabs-inverted.png");
 }
 
 toolbar[brighttext] #alltabs-button[type="menu"] {
-    list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow-inverted.png");
+  list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow-inverted.png");
 }
 
 #alltabs-button[type="menu"] > .toolbarbutton-icon {
-    margin: 0 2px;
+  margin: 0 2px;
 }
 
 #alltabs-button[type="menu"] > .toolbarbutton-menu-dropmarker {
-    display: none;
+  display: none;
 }
 
 /* All tabs menupopup */
 .alltabs-item > .menu-iconic-left > .menu-iconic-icon {
-    list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
+  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
 .alltabs-item[selected="true"] {
-    font-weight: bold; 
+  font-weight: bold; 
 }
 
 .alltabs-item[busy] > .menu-iconic-left > .menu-iconic-icon {
-    list-style-image: url("chrome://global/skin/icons/loading_16.png");
+  list-style-image: url("chrome://global/skin/icons/loading_16.png");
 }
 
 .alltabs-item[tabIsVisible] {
-    /* box-shadow instead of background-color to work around native styling */
-    box-shadow: inset -5px 0 ThreeDShadow;
+  /* box-shadow instead of background-color to work around native styling */
+  box-shadow: inset -5px 0 ThreeDShadow;
 }
 
 /* Tabstrip close button */
 .tabs-closebutton {
-    -moz-appearance: none;
-    padding: 4px 2px;
-    margin: 0px;
-    border: none;
+  -moz-appearance: none;
+  padding: 4px 2px;
+  margin: 0px;
+  border: none;
 }
 
 toolbar[brighttext] .tabs-closebutton {
-    list-style-image: url("chrome://global/skin/icons/close-inverted.png");
+  list-style-image: url("chrome://global/skin/icons/close-inverted.png");
 }
 
 @media (min-resolution: 2dppx) {
-    toolbar[brighttext] .tabs-closebutton {
-        list-style-image: url("chrome://global/skin/icons/close-inverted@2x.png");
-    }
+  toolbar[brighttext] .tabs-closebutton {
+    list-style-image: url("chrome://global/skin/icons/close-inverted@2x.png");
+  }
 }
   
 .tabs-closebutton > .toolbarbutton-icon {
-    -moz-margin-end: 0px !important;
-    -moz-padding-end: 2px !important;
-    -moz-padding-start: 2px !important;
+  margin-inline-end: 0px !important;
+  padding-inline-end: 2px !important;
+  padding-inline-start: 2px !important;
 }
 
 #sidebar-throbber[loading="true"] {
-    list-style-image: url("chrome://global/skin/icons/loading_16.png");
-    -moz-margin-end: 4px;
+  list-style-image: url("chrome://global/skin/icons/loading_16.png");
+  margin-inline-end: 4px;
 }
 
 /* Pale Moon: Feed icon */
 #ub-feed-button,
 #ub-feed-button > .button-box,
 #ub-feed-button:hover:active > .button-box {
-    padding: 0px;
-    margin: 0px;
-    border: 0px; 
-    background-color: transparent !important;
+  padding: 0px;
+  margin: 0px;
+  border: 0px; 
+  background-color: transparent !important;
 }
 
 #ub-feed-button {
-    -moz-appearance: none; 
-    min-width: 0px; 
-    list-style-image: url("chrome://browser/skin/feeds/feed-icons-16.png");
-    -moz-image-region: rect(0px 16px 16px 0px);
+  -moz-appearance: none; 
+  min-width: 0px; 
+  list-style-image: url("chrome://browser/skin/feeds/feed-icons-16.png");
+  -moz-image-region: rect(0px 16px 16px 0px);
 }
 
 #ub-feed-button:hover {
-    -moz-image-region: rect(0px 32px 16px 16px);
+  -moz-image-region: rect(0px 32px 16px 16px);
 }
 
 #ub-feed-button[open="true"],
 #ub-feed-button:hover:active {
-    -moz-image-region: rect(0px 48px 16px 32px);
+  -moz-image-region: rect(0px 48px 16px 32px);
 }
 
 
 /* Bookmarks toolbar */
 #PlacesToolbarDropIndicator {
-    list-style-image: url(chrome://browser/skin/places/toolbarDropMarker.png);
+  list-style-image: url(chrome://browser/skin/places/toolbarDropMarker.png);
 }
 
 toolbarbutton.bookmark-item[dragover="true"][open="true"] {
-    -moz-appearance: none;
-    background: Highlight !important;
-    color: HighlightText !important;
+  -moz-appearance: none;
+  background: Highlight !important;
+  color: HighlightText !important;
 }
 
 /* rules for menupopup drop indicators */
 .menupopup-drop-indicator-bar {
-    position: relative;
-    /* these two margins must together compensate the indicator's height */
-    margin-top: -1px;
-    margin-bottom: -1px;
+  position: relative;
+  /* these two margins must together compensate the indicator's height */
+  margin-top: -1px;
+  margin-bottom: -1px;
 }
 
 .menupopup-drop-indicator {
-    list-style-image: none;
-    height: 2px;
-    -moz-margin-end: -4em;
-    background-color: Highlight;
+  list-style-image: none;
+  height: 2px;
+  margin-inline-end: -4em;
+  background-color: Highlight;
 }
 
 /* ::::: Identity Indicator Styling ::::: */
 
 /* Popup Icons */
 #identity-popup-icon {
-    height: 64px;
-    width: 64px;
-    padding: 0;
-    list-style-image: url("chrome://browser/skin/identity.png");
-    -moz-image-region: rect(0px, 64px, 64px, 0px);
+  height: 64px;
+  width: 64px;
+  padding: 0;
+  list-style-image: url("chrome://browser/skin/identity.png");
+  -moz-image-region: rect(0px, 64px, 64px, 0px);
 }
 
 #identity-popup.verifiedDomain > #identity-popup-container > #identity-popup-icon {
-    -moz-image-region: rect(64px, 64px, 128px, 0px);
+  -moz-image-region: rect(64px, 64px, 128px, 0px);
 }
 
 #identity-popup.verifiedIdentity > #identity-popup-container > #identity-popup-icon {
-    -moz-image-region: rect(128px, 64px, 192px, 0px);
+  -moz-image-region: rect(128px, 64px, 192px, 0px);
 }
 
 /* Popup Body Text */
 .identity-popup-description {
-    white-space: pre-wrap;
-    -moz-padding-start: 15px;
-    margin: 2px 0 4px;
+  white-space: pre-wrap;
+  padding-inline-start: 15px;
+  margin: 2px 0 4px;
 }
 
 .identity-popup-label {
-    white-space: pre-wrap;
-    -moz-padding-start: 15px;
-    margin: 0;
+  white-space: pre-wrap;
+  padding-inline-start: 15px;
+  margin: 0;
 }
 
 #identity-popup-content-host,
 #identity-popup-content-box.verifiedIdentity > #identity-popup-content-owner {
-    font-size: 1.2em;
+  font-size: 1.2em;
 }
 
 #identity-popup-content-host {
-    margin-top: 3px;
-    margin-bottom: 5px;
-    font-weight: bold;
-    max-width: 300px;
+  margin-top: 3px;
+  margin-bottom: 5px;
+  font-weight: bold;
+  max-width: 300px;
 }
 
 #identity-popup-content-owner {
-    margin-top: 4px;
-    margin-bottom: 0 !important;
-    font-weight: bold;
-    max-width: 300px;
+  margin-top: 4px;
+  margin-bottom: 0 !important;
+  font-weight: bold;
+  max-width: 300px;
 }
 
 .verifiedDomain > #identity-popup-content-owner {
-    font-weight: normal;
+  font-weight: normal;
 }
 
 #identity-popup-content-verifier {
-    margin: 4px 0 2px;
+  margin: 4px 0 2px;
 }
 
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption ,
 #identity-popup-content-box.verifiedDomain > #identity-popup-encryption {
-    margin-top: 10px;
-    -moz-margin-start: -24px;
+  margin-top: 10px;
+  margin-inline-start: -24px;
 }
 
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption > vbox > #identity-popup-encryption-icon ,
 #identity-popup-content-box.verifiedDomain > #identity-popup-encryption > vbox > #identity-popup-encryption-icon {
-    list-style-image: url("chrome://browser/skin/Secure24.png");
+  list-style-image: url("chrome://browser/skin/Secure24.png");
 }
 
 #identity-popup-more-info-button {
-    margin-top: 6px;
-    margin-bottom: 0;
-    -moz-margin-end: 0;
+  margin-top: 6px;
+  margin-bottom: 0;
+  margin-inline-end: 0;
 }
 
 .popup-notification-icon {
-    width: 64px;
-    height: 64px;
-    -moz-margin-end: 10px;
+  width: 64px;
+  height: 64px;
+  margin-inline-end: 10px;
 }
 
 .popup-notification-icon[popupid="geolocation"] {
-    list-style-image: url(chrome://browser/skin/Geolocation-64.png);
+  list-style-image: url(chrome://browser/skin/Geolocation-64.png);
 }
 
 .popup-notification-icon[popupid="xpinstall-disabled"],
@@ -2203,198 +2264,198 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 .popup-notification-icon[popupid="addon-install-origin-blocked"],
 .popup-notification-icon[popupid="addon-install-failed"],
 .popup-notification-icon[popupid="addon-install-complete"] {
-    list-style-image: url(chrome://mozapps/skin/extensions/extensionGeneric.png);
-    width: 32px;
-    height: 32px;
+  list-style-image: url(chrome://mozapps/skin/extensions/extensionGeneric.png);
+  width: 32px;
+  height: 32px;
 }
 
 .popup-notification-icon[popupid="click-to-play-plugins"] {
-    list-style-image: url(chrome://mozapps/skin/plugins/pluginBlocked-64.png);
+  list-style-image: url(chrome://mozapps/skin/plugins/pluginBlocked-64.png);
 }
 
 .popup-notification-icon[popupid="web-notifications"] {
-    list-style-image: url(chrome://browser/skin/notification-64.png);
+  list-style-image: url(chrome://browser/skin/notification-64.png);
 }
 
 .addon-progress-description {
-    width: 350px;
-    max-width: 350px;
+  width: 350px;
+  max-width: 350px;
 }
 
 .popup-progress-label,
 .popup-progress-meter {
-    -moz-margin-start: 0;
-    -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 .popup-progress-cancel {
-    -moz-appearance: none;
-    background: transparent;
-    border: none;
-    padding: 0;
-    min-height: 16px;
-    min-width: 16px;
-    max-height: 16px;
-    max-width: 16px;
-    margin: 0 1px 0 1px;
-    list-style-image: url(chrome://mozapps/skin/downloads/buttons.png);
-    -moz-image-region: rect(0px, 16px, 16px, 0px);    
+  -moz-appearance: none;
+  background: transparent;
+  border: none;
+  padding: 0;
+  min-height: 16px;
+  min-width: 16px;
+  max-height: 16px;
+  max-width: 16px;
+  margin: 0 1px 0 1px;
+  list-style-image: url(chrome://mozapps/skin/downloads/buttons.png);
+  -moz-image-region: rect(0px, 16px, 16px, 0px);  
 }
 
 .popup-progress-cancel:hover {
-    -moz-image-region: rect(16px, 32px, 32px, 16px);
+  -moz-image-region: rect(16px, 32px, 32px, 16px);
 }
 
 .popup-progress-cancel:active {
-    -moz-image-region: rect(32px, 32px, 48px, 16px);
+  -moz-image-region: rect(32px, 32px, 48px, 16px);
 }
 
 .popup-notification-icon[popupid="indexedDB-permissions-prompt"],
 .popup-notification-icon[popupid="indexedDB-quota-prompt"],
 .popup-notification-icon[popupid*="offline-app-requested"],
 .popup-notification-icon[popupid="offline-app-usage"] {
-    list-style-image: url(chrome://global/skin/icons/question-64.png);
+  list-style-image: url(chrome://global/skin/icons/question-64.png);
 }
 
 .popup-notification-icon[popupid="password"] {
-    list-style-image: url(chrome://mozapps/skin/passwordmgr/key-64.png);
+  list-style-image: url(chrome://mozapps/skin/passwordmgr/key-64.png);
 }
 
 .popup-notification-icon[popupid="mixed-content-blocked"] {
-    list-style-image: url(chrome://browser/skin/mixed-content-blocked-64.png);
+  list-style-image: url(chrome://browser/skin/mixed-content-blocked-64.png);
 }
 
 %ifdef MOZ_WEBRTC
 .popup-notification-icon[popupid="webRTC-sharingDevices"],
 .popup-notification-icon[popupid="webRTC-shareDevices"] {
-    list-style-image: url(chrome://browser/skin/webRTC-shareDevice-64.png);
+  list-style-image: url(chrome://browser/skin/webRTC-shareDevice-64.png);
 }
 
 %endif
 .popup-notification-icon[popupid="pointerLock"] {
-    list-style-image: url(chrome://browser/skin/pointerLock-64.png);
+  list-style-image: url(chrome://browser/skin/pointerLock-64.png);
 }
 
 /* Notification icon box */
 #notification-popup-box {
-    position: relative;
-    background-color: #fff;
-    background-clip: padding-box;
-    padding-left: 3px;
-    border-radius: 2.5px 0 0 2.5px;
-    border-width: 0 8px 0 0;
-    border-style: solid;
-    border-image: url("chrome://browser/skin/urlbar-arrow.png") 0 8 0 0 fill;
-    -moz-margin-end: -8px;
+  position: relative;
+  background-color: #fff;
+  background-clip: padding-box;
+  padding-left: 3px;
+  border-radius: var(--toolbarbutton-border-radius) 0 0 var(--toolbarbutton-border-radius);
+  border-width: 0 8px 0 0;
+  border-style: solid;
+  border-image: url("chrome://browser/skin/urlbar-arrow.png") 0 8 0 0 fill;
+  margin-inline-end: -8px;
 }
 
 @conditionalForwardWithUrlbar@[forwarddisabled] + #urlbar-container > #urlbar > #notification-popup-box {
-    padding-left: 5px;
+  padding-left: 5px;
 }
 
 #notification-popup-box:-moz-locale-dir(rtl),
 .notification-anchor-icon:-moz-locale-dir(rtl) {
-    transform: scaleX(-1);
+  transform: scaleX(-1);
 }
 
 .notification-anchor-icon {
-    width: 16px;
-    height: 16px;
-    margin: 0 2px;
+  width: 16px;
+  height: 16px;
+  margin: 0 2px;
 }
 
 .notification-anchor-icon:-moz-focusring {
-    outline: 1px dotted -moz-DialogText;
-    outline-offset: -3px;
+  outline: 1px dotted -moz-DialogText;
+  outline-offset: -3px;
 }
 
 .default-notification-icon,
 #default-notification-icon {
-    list-style-image: url(chrome://global/skin/icons/information-16.png);
+  list-style-image: url(chrome://global/skin/icons/information-16.png);
 }
 
 .geo-notification-icon,
 #geo-notification-icon {
-    list-style-image: url(chrome://browser/skin/Geolocation-16.png);
+  list-style-image: url(chrome://browser/skin/Geolocation-16.png);
 }
 
 #addons-notification-icon {
-    list-style-image: url(chrome://mozapps/skin/extensions/extensionGeneric-16.png);
+  list-style-image: url(chrome://mozapps/skin/extensions/extensionGeneric-16.png);
 }
 
 .indexedDB-notification-icon,
 #indexedDB-notification-icon {
-    list-style-image: url(chrome://global/skin/icons/question-16.png);
+  list-style-image: url(chrome://global/skin/icons/question-16.png);
 }
 
 #password-notification-icon {
-    list-style-image: url(chrome://mozapps/skin/passwordmgr/key-16.png);
+  list-style-image: url(chrome://mozapps/skin/passwordmgr/key-16.png);
 }
 
 #plugins-notification-icon {
-    list-style-image: url(chrome://browser/skin/notification-pluginNormal.png);
+  list-style-image: url(chrome://browser/skin/notification-pluginNormal.png);
 }
 
 #alert-plugins-notification-icon {
-    list-style-image: url(chrome://browser/skin/notification-pluginAlert.png);
+  list-style-image: url(chrome://browser/skin/notification-pluginAlert.png);
 }
 
 #blocked-plugins-notification-icon {
-    list-style-image: url(chrome://browser/skin/notification-pluginBlocked.png);
+  list-style-image: url(chrome://browser/skin/notification-pluginBlocked.png);
 }
 
 #plugins-notification-icon,
 #alert-plugins-notification-icon,
 #blocked-plugins-notification-icon {
-    -moz-image-region: rect(0, 16px, 16px, 0);
+  -moz-image-region: rect(0, 16px, 16px, 0);
 }
 
 #plugins-notification-icon:hover,
 #alert-plugins-notification-icon:hover,
 #blocked-plugins-notification-icon:hover {
-    -moz-image-region: rect(0, 32px, 16px, 16px);
+  -moz-image-region: rect(0, 32px, 16px, 16px);
 }
 
 #plugins-notification-icon:active,
 #alert-plugins-notification-icon:active,
 #blocked-plugins-notification-icon:active {
-    -moz-image-region: rect(0, 48px, 16px, 32px);
+  -moz-image-region: rect(0, 48px, 16px, 32px);
 }
 
 #notification-popup-box[hidden] {
-    /* Override display:none to make the pluginBlockedNotification animation work
-       when showing the notification repeatedly. */
-    display: -moz-box;
-    visibility: collapse;
+  /* Override display:none to make the pluginBlockedNotification animation work
+     when showing the notification repeatedly. */
+  display: -moz-box;
+  visibility: collapse;
 }
 
 #blocked-plugins-notification-icon[showing] {
-    animation: pluginBlockedNotification 500ms ease 0s 5 alternate both;
+  animation: pluginBlockedNotification 500ms ease 0s 5 alternate both;
 }
 
 @keyframes pluginBlockedNotification {
-    from {
-        opacity: 0;
-    }
-    to {
-        opacity: 1;
-    }
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
 }
 
 .mixed-content-blocked-notification-icon,
 #mixed-content-blocked-notification-icon {
-    list-style-image: url(chrome://browser/skin/mixed-content-blocked-16.png);
+  list-style-image: url(chrome://browser/skin/mixed-content-blocked-16.png);
 }
 
 %ifdef MOZ_WEBRTC
 .webRTC-shareDevices-notification-icon,
 #webRTC-shareDevices-notification-icon {
-    list-style-image: url(chrome://browser/skin/webRTC-shareDevice-16.png);
+  list-style-image: url(chrome://browser/skin/webRTC-shareDevice-16.png);
 }
 
 .webRTC-sharingDevices-notification-icon,
 #webRTC-sharingDevices-notification-icon {
-    list-style-image: url(chrome://browser/skin/webRTC-sharingDevice-16.png);
+  list-style-image: url(chrome://browser/skin/webRTC-sharingDevice-16.png);
 }
 %endif
 
@@ -2415,14 +2476,14 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 }
 
 #pointerLock-notification-icon {
-    list-style-image: url(chrome://browser/skin/pointerLock-16.png);
+  list-style-image: url(chrome://browser/skin/pointerLock-16.png);
 }
 #pointerLock-cancel {
-    margin: 0px;
+  margin: 0px;
 }
 
 #identity-popup-container {
-    min-width: 280px;
+  min-width: 280px;
 }
 
 /* Bookmarks roots menu-items */
@@ -2432,59 +2493,59 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 #subscribeToPageMenupopup,
 #BMB_subscribeToPageMenuitem:not([disabled]),
 #BMB_subscribeToPageMenupopup {
-    list-style-image: url("chrome://browser/skin/feeds/feedIcon16.png");
+  list-style-image: url("chrome://browser/skin/feeds/feedIcon16.png");
 }
 
 #appmenu_bookmarksToolbar,
 #bookmarksToolbarFolderMenu,
 #BMB_bookmarksToolbar {
-    list-style-image: url("chrome://browser/skin/places/bookmarksToolbar.png");
-    -moz-image-region: auto;
+  list-style-image: url("chrome://browser/skin/places/bookmarksToolbar.png");
+  -moz-image-region: auto;
 }
 
 @media (min-resolution: 2dppx) {
   #bookmarksToolbarFolderMenu,
   #BMB_bookmarksToolbar {
-    list-style-image: url("chrome://browser/skin/places/bookmarksToolbar@2x.png");
-    -moz-image-region: auto;
+  list-style-image: url("chrome://browser/skin/places/bookmarksToolbar@2x.png");
+  -moz-image-region: auto;
   }
 }
 
 #appmenu_unsortedBookmarks,
 #BMB_unsortedBookmarks {
-    list-style-image: url("chrome://browser/skin/places/unsortedBookmarks.png");
-    -moz-image-region: auto;
+  list-style-image: url("chrome://browser/skin/places/unsortedBookmarks.png");
+  -moz-image-region: auto;
 }
 
 /* ::::: Keyboard UI Panel ::::: */
 
 .KUI-panel {
-    -moz-appearance: none;
-    background: rgba(27%,27%,27%,.9) url(KUI-background.png) repeat-x;
-    color: white;
-    border-style: none;
-    border-radius: 20px;
+  -moz-appearance: none;
+  background: rgba(27%,27%,27%,.9) url(KUI-background.png) repeat-x;
+  color: white;
+  border-style: none;
+  border-radius: 20px;
 }
 
 .KUI-panel[level="top"] {
-    background-color: rgba(27%,27%,27%,.65);
+  background-color: rgba(27%,27%,27%,.65);
 }
 
 .KUI-panel-closebutton {
-    list-style-image: url(KUI-close.png);
-    -moz-appearance: none;
-    border: none;
-    padding: 0;
-    width: 24px;
-    height: 24px;
+  list-style-image: url(KUI-close.png);
+  -moz-appearance: none;
+  border: none;
+  padding: 0;
+  width: 24px;
+  height: 24px;
 }
 
 .KUI-panel-closebutton:not(:hover) {
-    opacity: .6;
+  opacity: .6;
 }
 
 .KUI-panel-closebutton > .toolbarbutton-icon {
-    margin: 0;
+  margin: 0;
 }
 
 /* ::::: Ctrl-Tab and All Tabs Panels ::::: */
@@ -2492,205 +2553,205 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 /* Ctrl-Tab */
 
 #ctrlTab-panel {
-    padding: 20px 10px 10px;
-    font-weight: bold;
-    text-shadow: 0 0 1px rgb(27%,27%,27%), 0 0 2px rgb(27%,27%,27%);
+  padding: 20px 10px 10px;
+  font-weight: bold;
+  text-shadow: 0 0 1px rgb(27%,27%,27%), 0 0 2px rgb(27%,27%,27%);
 }
 
 .ctrlTab-favicon[src] {
-    background-color: white;
-    width: 20px;
-    height: 20px;
-    padding: 2px;
+  background-color: white;
+  width: 20px;
+  height: 20px;
+  padding: 2px;
 }
 
 .ctrlTab-preview-inner > .tabPreview-canvas {
-    box-shadow: 1px 1px 2px rgb(12%,12%,12%);
+  box-shadow: 1px 1px 2px rgb(12%,12%,12%);
 }
 
 .ctrlTab-preview:not(#ctrlTab-showAll) > * > .ctrlTab-preview-inner > .tabPreview-canvas {
-    margin-bottom: 2px;
+  margin-bottom: 2px;
 }
 
 .ctrlTab-preview-inner {
-    padding-bottom: 10px;
+  padding-bottom: 10px;
 }
 
 #ctrlTab-showAll:not(:focus) > * > .ctrlTab-preview-inner {
-    padding: 10px;
-    background-color: rgba(255,255,255,.2);
-    border-radius: .5em;
+  padding: 10px;
+  background-color: rgba(255,255,255,.2);
+  border-radius: .5em;
 }
 
 .ctrlTab-preview:focus > * > .ctrlTab-preview-inner {
-    color: white;
-    background-color: rgba(0,0,0,.6);
-    text-shadow: none;
-    padding: 8px;
-    border: 2px solid white;
-    border-radius: .5em;
+  color: white;
+  background-color: rgba(0,0,0,.6);
+  text-shadow: none;
+  padding: 8px;
+  border: 2px solid white;
+  border-radius: .5em;
 }
 
 .ctrlTab-preview:not(#ctrlTab-showAll):focus > * > .ctrlTab-preview-inner {
-    margin: -10px -10px 0;
+  margin: -10px -10px 0;
 }
 
 #ctrlTab-showAll {
-    margin-top: .5em;
+  margin-top: .5em;
 }
 
 /* All Tabs */
 
 #allTabs-panel {
-    padding-bottom: 10px;
-    -moz-appearance: none;
-    border: none;
-    background: -moz-dialog;
-    color: -moz-dialogText;
+  padding-bottom: 10px;
+  -moz-appearance: none;
+  border: none;
+  background: -moz-dialog;
+  color: -moz-dialogText;
 }
 
 #allTabs-meta {
-    margin: 10px;
+  margin: 10px;
 }
 
 #allTabs-filter {
-    -moz-margin-start: 24px;
-    -moz-margin-end: 0;
+  margin-inline-start: 24px;
+  margin-inline-end: 0;
 }
 
 #allTabs-tab-close-button > .toolbarbutton-icon {
-    margin: 0;
+  margin: 0;
 }
 
 /* Make sure the allTab previews always have regular close buttons */
 #allTabs-tab-close-button:-moz-lwtheme-brighttext {
-    list-style-image: url("chrome://global/skin/icons/close.png");
+  list-style-image: url("chrome://global/skin/icons/close.png");
 }
 
 .allTabs-favicon[src] {
-    background-color: -moz-dialog;
-    width: 22px;
-    height: 22px;
-    padding-top: 1px;
-    padding-bottom: 5px;
-    -moz-padding-start: 1px;
-    -moz-padding-end: 5px;
-    margin-top: -2px;
-    -moz-margin-start: -2px;
-    border-bottom-right-radius: 4px;
+  background-color: -moz-dialog;
+  width: 22px;
+  height: 22px;
+  padding-top: 1px;
+  padding-bottom: 5px;
+  padding-inline-start: 1px;
+  padding-inline-end: 5px;
+  margin-top: -2px;
+  margin-inline-start: -2px;
+  border-bottom-right-radius: 4px;
 }
 
 .allTabs-favicon[src]:-moz-locale-dir(rtl) {
-    border-bottom-right-radius: 0;
-    border-bottom-left-radius: 4px;
+  border-bottom-right-radius: 0;
+  border-bottom-left-radius: 4px;
 }
 
 .allTabs-preview-inner > .tabPreview-canvas {
-    background-color: rgb(60%,60%,60%);
-    box-shadow: 0 0 1.5px ThreeDShadow;
+  background-color: rgb(60%,60%,60%);
+  box-shadow: 0 0 1.5px ThreeDShadow;
 }
 
 .allTabs-preview:not(:hover):not([closebuttonhover]) > html|canvas {
-    opacity: .8;
+  opacity: .8;
 }
 
 .allTabs-preview:focus > * > .allTabs-preview-inner {
-    outline: 1px dotted -moz-dialogText;
+  outline: 1px dotted -moz-dialogText;
 }
 
 /* Add-on bar */
 
 #addon-bar {
-    -moz-appearance: none;
-    min-height: 20px;
-    border-top-style: none;
-    border-bottom-style: none;
-    padding-top: 1px;
-    background-image: linear-gradient(rgba(0,0,0,.15) 1px, rgba(255,255,255,.15) 1px);
-    background-size: 100% 2px;
-    background-repeat: no-repeat;
+  -moz-appearance: none;
+  min-height: 20px;
+  border-top-style: none;
+  border-bottom-style: none;
+  padding-top: 1px;
+  background-image: linear-gradient(rgba(0,0,0,.15) 1px, rgba(255,255,255,.15) 1px);
+  background-size: 100% 2px;
+  background-repeat: no-repeat;
 }
 
 #status-bar {
-    -moz-appearance: none;
-    background-color: transparent;
-    border: none;
-    min-height: 0;
+  -moz-appearance: none;
+  background-color: transparent;
+  border: none;
+  min-height: 0;
 }
 
 #addon-bar[customizing] > #status-bar {
-    opacity: .5;
-    background-image: repeating-linear-gradient(135deg,
-        rgba(255,255,255,.3), rgba(255,255,255,.3) 5px,
-        rgba(0,0,0,.3) 5px, rgba(0,0,0,.3) 10px);
+  opacity: .5;
+  background-image: repeating-linear-gradient(135deg,
+    rgba(255,255,255,.3), rgba(255,255,255,.3) 5px,
+    rgba(0,0,0,.3) 5px, rgba(0,0,0,.3) 10px);
 }
 
 #status-bar > statusbarpanel {
-    border-width: 0;
-    -moz-appearance: none;
+  border-width: 0;
+  -moz-appearance: none;
 }
 
 #addonbar-closebutton {
-    border: none;
-    padding: 0 5px;
-    -moz-appearance: none;
+  border: none;
+  padding: 0 5px;
+  -moz-appearance: none;
 }
 
 toolbar[brighttext] #addonbar-closebutton {
-    list-style-image: url("chrome://global/skin/icons/close-inverted.png");
+  list-style-image: url("chrome://global/skin/icons/close-inverted.png");
 }
 
 @media (min-resolution: 2dppx) {
-    toolbar[brighttext] #addonbar-closebutton {
-        list-style-image: url("chrome://global/skin/icons/close-inverted@2x.png");
-    }
+  toolbar[brighttext] #addonbar-closebutton {
+    list-style-image: url("chrome://global/skin/icons/close-inverted@2x.png");
+  }
 }
 
 /* Status panel */
 
 .statuspanel-label {
-    margin: 0;
-    padding: 2px 4px;
-    background: linear-gradient(#fff, #ddd);
-    border: 1px none #ccc;
-    border-top-style: solid;
-    color: #333;
-    text-shadow: none;
+  margin: 0;
+  padding: 2px 4px;
+  background: linear-gradient(#fff, #ddd);
+  border: 1px none #ccc;
+  border-top-style: solid;
+  color: #333;
+  text-shadow: none;
 }
 
 .statuspanel-label:-moz-locale-dir(ltr):not([mirror]),
 .statuspanel-label:-moz-locale-dir(rtl)[mirror] {
-    border-right-style: solid;
-    /* disabled for triggering grayscale AA (bug 659213)
-    border-top-right-radius: .3em;
-    */
-    margin-right: 1em;
+  border-right-style: solid;
+  /* disabled for triggering grayscale AA (bug 659213)
+  border-top-right-radius: .3em;
+  */
+  margin-right: 1em;
 }
 
 .statuspanel-label:-moz-locale-dir(rtl):not([mirror]),
 .statuspanel-label:-moz-locale-dir(ltr)[mirror] {
-    border-left-style: solid;
-    /* disabled for triggering grayscale AA (bug 659213)
-    border-top-left-radius: .3em;
-    */
-    margin-left: 1em;
+  border-left-style: solid;
+  /* disabled for triggering grayscale AA (bug 659213)
+  border-top-left-radius: .3em;
+  */
+  margin-left: 1em;
 }
 
 #full-screen-warning-message {
-    background-color: hsl(0,0%,15%);
-    color: white;
-    border-radius: 8px;
-    margin-top: 30px;
-    padding: 30px 50px;
-    box-shadow: 0 0 2px white;
+  background-color: hsl(0,0%,15%);
+  color: white;
+  border-radius: 8px;
+  margin-top: 30px;
+  padding: 30px 50px;
+  box-shadow: 0 0 2px white;
 }
 
 .full-screen-description {
-    font-size: 150%;
+  font-size: 150%;
 }
 
 #full-screen-domain-text {
-    font-size: 300%;
+  font-size: 300%;
 }
 
 %ifdef MOZ_DEVTOOLS
@@ -2703,50 +2764,51 @@ toolbar[brighttext] #addonbar-closebutton {
 /* Error counter */
 
 #developer-toolbar-toolbox-button[error-count]:before {
-    color: #FDF3DE;
-    min-width: 16px;
-    text-shadow: none;
-    background-image: linear-gradient(#B4211B, #8A1915);
-    border-radius: 1px;
-    -moz-margin-end: 5px;
+  color: #FDF3DE;
+  min-width: 16px;
+  text-shadow: none;
+  background-image: linear-gradient(#B4211B, #8A1915);
+  border-radius: 1px;
+  margin-inline-end: 5px;
 }
 %endif
 
 .toolbarbutton-badge-stack {
-    margin: 0;
-    padding: 0;
-    position: relative;
+  margin: 0;
+  padding: 0;
+  position: relative;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-badge-stack {
-    padding: 2px 5px;
+  padding: 2px 5px;
 }
 
 .toolbarbutton-1 > .toolbarbutton-badge-stack > .toolbar-icon {
-    position: absolute;
-    top: 2px;
-    right: 2px;
+  position: absolute;
+  top: 2px;
+  right: 2px;
 }
 
 .toolbarbutton-badge-stack > .toolbarbutton-icon[label]:not([label=""]) {
-    -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 @navbarLargeIcons@ *|* > .toolbarbutton-badge[badge]:not([badge=""])::after {
-    top: 1px;
-    right: 1px;
+  top: 1px;
+  right: 1px;
 }
 
 .toolbarbutton-badge[badge]:not([badge=""]):-moz-locale-dir(rtl)::after {
-    left: 0;
-    right: auto;
+  left: 0;
+  right: auto;
 }
 
 @navbarLargeIcons@ *|* > .toolbarbutton-badge[badge]:not([badge=""]):-moz-locale-dir(rtl)::after {
-    left: 1px;
-    right: auto;
+  left: 1px;
+  right: auto;
 }
 
+%ifdef MOZ_CAN_DRAW_IN_TITLEBAR
 #main-window[privatebrowsingmode=temporary] {
   background-image: url("chrome://browser/skin/privatebrowsing-mask.png");
   background-position: top right;
@@ -2756,8 +2818,8 @@ toolbar[brighttext] #addonbar-closebutton {
 
 @media (min-resolution: 2dppx) {
   #main-window[privatebrowsingmode=temporary] {
-    background-image: url("chrome://browser/skin/privatebrowsing-mask@2x.png");
-    background-size: 38px;
+  background-image: url("chrome://browser/skin/privatebrowsing-mask@2x.png");
+  background-size: 38px;
   }
 }
 
@@ -2782,21 +2844,22 @@ toolbar[brighttext] #addonbar-closebutton {
 }
 
 #main-window[privatebrowsingmode=temporary][inFullscreen] #nav-bar[tabsontop=false] {
-  -moz-padding-end: 50px !important;
+  padding-inline-end: 50px !important;
 }
 
 @media (-moz-mac-lion-theme) {
   #main-window[privatebrowsingmode=temporary][inFullscreen] #TabsToolbar[tabsontop=true] {
-    -moz-padding-end: 50px;
+  padding-inline-end: 50px;
   }
 }
 
 @media not all and (-moz-mac-lion-theme) {
   #main-window[privatebrowsingmode=temporary] {
-    background-position: top right 10px;
+  background-position: top right 10px;
   }
 
   #main-window[privatebrowsingmode=temporary][inFullscreen][tabsontop=true] #window-controls {
-    -moz-padding-end: 50px;
+  padding-inline-end: 50px;
   }
 }
+%endif
\ No newline at end of file
diff --git a/palemoon/themes/osx/downloads/allDownloadsViewOverlay.css b/palemoon/themes/osx/downloads/allDownloadsViewOverlay.css
index eb99f4c1f..0cfc5f81b 100644
--- a/palemoon/themes/osx/downloads/allDownloadsViewOverlay.css
+++ b/palemoon/themes/osx/downloads/allDownloadsViewOverlay.css
@@ -14,7 +14,7 @@
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
   /* explicitly size the icon, so size doesn't vary on hidpi systems */
   height: 32px;
   width: 32px;
diff --git a/palemoon/themes/osx/downloads/download-glow.png b/palemoon/themes/osx/downloads/download-glow.png
deleted file mode 100644
index 53182d7a4..000000000
--- a/palemoon/themes/osx/downloads/download-glow.png
+++ /dev/null
diff --git a/palemoon/themes/osx/downloads/downloads.css b/palemoon/themes/osx/downloads/downloads.css
index 267574e2c..2f9733a98 100644
--- a/palemoon/themes/osx/downloads/downloads.css
+++ b/palemoon/themes/osx/downloads/downloads.css
@@ -57,7 +57,7 @@
 #downloadsSummary,
 richlistitem[type="download"] {
   height: 7em;
-  -moz-padding-end: 0;
+  padding-inline-end: 0;
   color: inherit;
 }
 
@@ -104,7 +104,7 @@ richlistitem[type="download"]:first-child {
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
   /* Prevent flickering when changing states. */
   height: 32px;
   width: 32px;
@@ -251,37 +251,39 @@ richlistitem[type="download"]:hover > stack > .downloadButton.downloadRetry:acti
 /*** Main indicator icon ***/
 
 #downloads-indicator-icon {
-  background: -moz-image-rect(url("chrome://browser/skin/Toolbar.png"),
+  background: -moz-image-rect(var(--toolbarbutton-image),
                               0, 108, 18, 90) center no-repeat;
   min-width: 18px;
   min-height: 18px;
 }
 
 toolbar[brighttext] #downloads-indicator-icon {
-  background: -moz-image-rect(url("chrome://browser/skin/Toolbar-inverted.png"),
+  background: -moz-image-rect(var(--toolbarbutton-inverted-image),
                               0, 108, 18, 90) center no-repeat;
 }
 
 #downloads-indicator[attention] > #downloads-indicator-anchor > #downloads-indicator-icon {
-  background-image: url("chrome://browser/skin/downloads/download-glow.png");
+  background: -moz-image-rect(var(--toolbarbutton-image),
+                              19, 108, 36, 90) center no-repeat;
 }
 
 /* In the next few rules, we use :not([counter]) as a shortcut that is
    equivalent to -moz-any([progress], [paused]). */
 
 #downloads-indicator:not([counter]) > #downloads-indicator-anchor > #downloads-indicator-progress-area > #downloads-indicator-counter {
-  background: -moz-image-rect(url("chrome://browser/skin/Toolbar.png"),
+  background: -moz-image-rect(var(--toolbarbutton-image),
                               0, 108, 18, 90) center no-repeat;
   background-size: 12px;
 }
 
 toolbar[brighttext] #downloads-indicator:not([counter]) > #downloads-indicator-anchor > #downloads-indicator-progress-area > #downloads-indicator-counter {
-  background: -moz-image-rect(url("chrome://browser/skin/Toolbar-inverted.png"),
+  background: -moz-image-rect(var(--toolbarbutton-inverted-image),
                               0, 108, 18, 90) center no-repeat;
 }
 
 #downloads-indicator:not([counter])[attention] > #downloads-indicator-anchor > #downloads-indicator-progress-area > #downloads-indicator-counter {
-  background-image: url("chrome://browser/skin/downloads/download-glow.png");
+  background: -moz-image-rect(var(--toolbarbutton-image),
+                              19, 108, 36, 90) center no-repeat;
 }
 
 /*** Download notifications ***/
@@ -376,7 +378,7 @@ toolbar[brighttext] #downloads-indicator-counter {
   background-image: linear-gradient(#505050, #575757);
   border: 1px solid;
   border-color: hsla(0,0%,0%,.6) hsla(0,0%,0%,.4) hsla(0,0%,0%,.4);
-  -moz-border-start: none;
+  border-inline-start: none;
   border-radius: 0 2px 2px 0;
 }
 
diff --git a/palemoon/themes/osx/engineManager.css b/palemoon/themes/osx/engineManager.css
index 18817cd4f..c6d42cce2 100644
--- a/palemoon/themes/osx/engineManager.css
+++ b/palemoon/themes/osx/engineManager.css
@@ -5,8 +5,8 @@
 %endif
 
 #engineList treechildren::-moz-tree-image(engineName) {
-  -moz-margin-end: 4px;
-  -moz-margin-start: 1px;
+  margin-inline-end: 4px;
+  margin-inline-start: 1px;
   width: 16px;
   height: 16px;
 }
diff --git a/palemoon/themes/osx/feeds/subscribe-ui.css b/palemoon/themes/osx/feeds/subscribe-ui.css
index 8ca53283b..f21c037e6 100644
--- a/palemoon/themes/osx/feeds/subscribe-ui.css
+++ b/palemoon/themes/osx/feeds/subscribe-ui.css
@@ -7,17 +7,17 @@
 }
 
 .handlersMenuPopup > menuitem {
-  -moz-padding-start: 23px;
+  padding-inline-start: 23px;
 }
 
 .handlersMenuPopup > menuitem.menuitem-iconic {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 .handlersMenuPopup > .menuitem-iconic  > .menu-iconic-left {
   display: -moz-box;
   min-width: 16px;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 .chooseApplicationMenuItem {
diff --git a/palemoon/themes/osx/feeds/subscribe.css b/palemoon/themes/osx/feeds/subscribe.css
index 780a7f8b2..3a93c6456 100644
--- a/palemoon/themes/osx/feeds/subscribe.css
+++ b/palemoon/themes/osx/feeds/subscribe.css
@@ -10,7 +10,7 @@ html {
 #feedBody {
   border: 1px solid THreeDShadow;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   margin: 2em auto;
   background: -moz-Field;
 }
@@ -25,9 +25,9 @@ html {
 #feedHeader {  
   margin-top: 4.9em;
   margin-bottom: 1em;
-  -moz-margin-start: 1.4em;
-  -moz-margin-end: 1em;
-  -moz-padding-start: 2.9em;
+  margin-inline-start: 1.4em;
+  margin-inline-end: 1em;
+  padding-inline-start: 2.9em;
   font-size: 110%;
   color: InfoText;
 }
@@ -54,12 +54,12 @@ html {
 
 #feedHeader[firstrun="true"] #feedIntroText {
   padding-top: 0.1em;
-  -moz-padding-start: 0.6em;
+  padding-inline-start: 0.6em;
   display: block;
 }
 
 #feedHeader[firstrun="true"] > #feedSubscribeLine {
-  -moz-padding-start: 1.8em;
+  padding-inline-start: 1.8em;
 }
 
 #feedSubscribeLine {
@@ -95,8 +95,8 @@ h2 {
 
 #feedTitleLink {
   float: right;
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
 }
@@ -106,15 +106,15 @@ a[href] img {
 }
 
 #feedTitleContainer {
-  -moz-margin-start: 0;
-  -moz-margin-end: .6em;
+  margin-inline-start: 0;
+  margin-inline-end: .6em;
   margin-top: 0;
   margin-bottom: 0;
 }
 
 #feedTitleImage {
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
   max-width: 300px;
diff --git a/palemoon/themes/osx/jar.mn b/palemoon/themes/osx/jar.mn
index 67339c7cc..9b4876354 100644
--- a/palemoon/themes/osx/jar.mn
+++ b/palemoon/themes/osx/jar.mn
@@ -17,8 +17,6 @@ browser.jar:
 #endif
 * skin/classic/browser/autocomplete.css
   skin/classic/browser/actionicon-tab.png
-  skin/classic/browser/appmenu-icons.png
-  skin/classic/browser/appmenu-dropmarker.png
 * skin/classic/browser/browser.css
   skin/classic/browser/click-to-play-warning-stripes.png
 * skin/classic/browser/engineManager.css
@@ -60,7 +58,7 @@ browser.jar:
   skin/classic/browser/privatebrowsing-light.png
   skin/classic/browser/privatebrowsing-dark.png
   skin/classic/browser/reload-stop-go.png
-  skin/classic/browser/Search-glass.png
+  skin/classic/browser/Search.png
   skin/classic/browser/searchbar.css
   skin/classic/browser/searchbar-dropdown-arrow.png
   skin/classic/browser/Secure24.png
@@ -68,6 +66,8 @@ browser.jar:
   skin/classic/browser/slowStartup-16.png
   skin/classic/browser/Toolbar.png
   skin/classic/browser/Toolbar-inverted.png
+  skin/classic/browser/Toolbar.svg
+  skin/classic/browser/Toolbar-inverted.svg
   skin/classic/browser/toolbarbutton-dropdown-arrow.png
   skin/classic/browser/toolbarbutton-dropdown-arrow-inverted.png
   skin/classic/browser/urlbar-arrow.png
@@ -84,7 +84,6 @@ browser.jar:
   skin/classic/browser/webRTC-sharingDevice-16.png
 #endif
   skin/classic/browser/downloads/buttons.png                          (downloads/buttons.png)
-  skin/classic/browser/downloads/download-glow.png                    (downloads/download-glow.png)
   skin/classic/browser/downloads/download-notification-finish.png     (downloads/download-notification-finish.png)
   skin/classic/browser/downloads/download-notification-start.png      (downloads/download-notification-start.png)
   skin/classic/browser/downloads/download-summary.png                 (downloads/download-summary.png)
@@ -119,6 +118,7 @@ browser.jar:
   skin/classic/browser/places/toolbarDropMarker.png                   (places/toolbarDropMarker.png)
   skin/classic/browser/places/editBookmarkOverlay.css                 (places/editBookmarkOverlay.css)
   skin/classic/browser/places/libraryToolbar.png                      (places/libraryToolbar.png)
+  skin/classic/browser/places/libraryToolbar.svg                      (places/libraryToolbar.svg)
   skin/classic/browser/places/starred48.png                           (places/starred48.png)
   skin/classic/browser/places/unstarred48.png                         (places/unstarred48.png)
   skin/classic/browser/places/unfiledBookmarks.png                    (places/unfiledBookmarks.png)
diff --git a/palemoon/themes/osx/pageInfo.css b/palemoon/themes/osx/pageInfo.css
index f205b57bb..f958d9ce2 100644
--- a/palemoon/themes/osx/pageInfo.css
+++ b/palemoon/themes/osx/pageInfo.css
@@ -6,7 +6,7 @@
 
 /* View buttons */
 #viewGroup {
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
 }
 
 #viewGroup > radio {
@@ -31,7 +31,7 @@
 
 #topBar {
   border-bottom: 2px groove ThreeDFace;
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
   background-color: -moz-Field;
   color: -moz-FieldText;
 }
@@ -98,7 +98,7 @@ textbox {
 }
 
 textbox.header {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 .iframe {
@@ -121,8 +121,8 @@ groupbox.collapsable caption .caption-icon {
   height: 9px;
   background-repeat: no-repeat;
   background-position: center;
-  -moz-margin-start: 2px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 2px;
+  margin-inline-end: 2px;
   background-image: url("chrome://global/skin/tree/twisty-open.png");
 }
 
@@ -142,7 +142,7 @@ groupbox tree {
 }
 
 #securityBox description { 
-  -moz-margin-start: 10px;
+  margin-inline-start: 10px;
 }
 
 #general-security-identity {
@@ -187,8 +187,8 @@ treechildren::-moz-tree-cell-text(broken) {
 #feedListbox richlistitem {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
@@ -225,8 +225,8 @@ treechildren::-moz-tree-cell-text(broken) {
 .permission {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
diff --git a/palemoon/themes/osx/permissions/aboutPermissions.css b/palemoon/themes/osx/permissions/aboutPermissions.css
index f9a4a88af..4886da2be 100644
--- a/palemoon/themes/osx/permissions/aboutPermissions.css
+++ b/palemoon/themes/osx/permissions/aboutPermissions.css
@@ -43,7 +43,7 @@
 .site-favicon {
   height: 16px;
   width: 16px;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
@@ -60,7 +60,7 @@
 
 #site-description {
   font-size: 125%;
-  -moz-margin-start: 6px; /* to match button margin */
+  margin-inline-start: 6px; /* to match button margin */
 }
 
 #site-label {
@@ -72,7 +72,7 @@
 #defaults-description {
   font-size: 125%;
   font-weight: bold;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 .pref-item {
@@ -82,7 +82,7 @@
 .pref-icon {
   width: 36px;
   height: 36px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .pref-icon[type="password"] {
diff --git a/palemoon/themes/osx/places/libraryToolbar.svg b/palemoon/themes/osx/places/libraryToolbar.svg
new file mode 100644
index 000000000..5fcf42ae3
--- /dev/null
+++ b/palemoon/themes/osx/places/libraryToolbar.svg
@@ -0,0 +1,41 @@
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="48" height="16" viewBox="0 0 48 16">
+  <defs>
+    <linearGradient id="starGradient" x1="24.5" x2="24.5" y1="1081" y2="1121" gradientTransform="matrix(.318 0 0 .317 30.2 -342)" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#f9f3ac"/>
+      <stop offset="1" stop-color="#ffdc46"/>
+    </linearGradient>
+    <linearGradient id="fileGradient" x1="5" x2="5" y1=".842" y2="9.16" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#fff"/>
+      <stop offset="1" stop-color="#e3f1fc"/>
+    </linearGradient>
+  </defs>
+  <g id="file">
+    <use width="100%" height="100%" transform="translate(6 6)" xlink:href="#file-individual"/>
+    <use width="100%" height="100%" transform="translate(4 4)" xlink:href="#file-individual"/>
+    <use width="100%" height="100%" transform="translate(2 2)" xlink:href="#file-individual"/>
+    <g id="file-individual">
+      <path fill="url(#fileGradient)" d="M1 0h8v10H1z"/>
+      <path fill="#9c9c9c" d="M1 0v10h8V0zm1 1h6v8H2z"/>
+    </g>
+  </g>
+  <g id="view">
+    <path fill="#a7dd8c" d="M17 2v1h2V2z"/>
+    <path fill="#eaedf4" d="M20 2v1h7V2zm8 0v1h3V2zm-8 2v1h7V4zm8 0v1h3V4zm-8 2v1h7V6zm8 0v1h3V6zm-8 3v1h7V9zm8 0v1h3V9zm-8 2v1h7v-1zm8 0v1h3v-1zm-8 2v1h7v-1zm8 0v1h3v-1z"/>
+    <path fill-opacity=".3" d="M17 3v1h2V3zm3 0v1h7V3zm8 0v1h3V3zM17 5v1h2V5zm3 0v1h7V5zm8 0v1h3V5zM17 7v1h2V7zm3 0v1h7V7zm8 0v1h3V7zm-11 3v1h2v-1zm3 0v1h7v-1zm8 0v1h3v-1zm-11 2v1h2v-1zm3 0v1h7v-1zm8 0v1h3v-1zm-11 2v1h2v-1zm3 0v1h7v-1zm8 0v1h3v-1z"/>
+    <path fill="#c5a2ec" d="M17 4v1h2V4z"/>
+    <path fill="#ec8e8e" d="M17 6v1h2V6z"/>
+    <path fill="#8ebbec" d="M17 9v1h2V9z"/>
+    <path fill="#a7dd8c" d="M17 11v1h2v-1z"/>
+    <path fill="#fac090" d="M17 13v1h2v-1z"/>
+  </g>
+  <g id="bk-restore">
+    <g id="star">
+      <path fill="url(#starGradient)" d="M34.2 9.73c.213-2.14.213-2.14-.921-3.23-1.66-1.6-1.52-2.14.636-2.41 1.76-.22 1.78-.23 2.61-1.93.488-.992 1.05-1.7 1.34-1.7.293 0 .856.717 1.35 1.72.841 1.71.854 1.72 2.61 1.94 2.15.268 2.28.789.629 2.38-1.13 1.09-1.13 1.09-.921 3.23.251 2.52.023 2.65-2.26 1.32-1.41-.823-1.41-.823-2.81 0-2.28 1.33-2.51 1.2-2.26-1.32z"/>
+      <path fill="#cd9a34" d="M38 0c-.299 0-.462.127-.608.245a2.635 2.635 0 0 0-.405.427 7.3 7.3 0 0 0-.769 1.26c-.396.805-.589 1.13-.738 1.24-.15.111-.468.179-1.3.283-.535.067-.96.148-1.32.287-.357.139-.715.384-.825.8-.11.417.055.788.274 1.12.219.328.53.662.939 1.06.539.519.706.698.767.911.06.213.04.683-.062 1.7-.06.607-.095 1.08-.07 1.47.012.198.037.381.107.566a.995.995 0 0 0 .411.502c.408.238.81.117 1.19-.035.38-.152.808-.391 1.36-.712.67-.391.938-.508 1.05-.508.114 0 .383.117 1.05.508.55.32.981.56 1.36.712.38.152.78.274 1.19.035a.995.995 0 0 0 .411-.502c.071-.185.096-.367.108-.566.025-.397-.01-.867-.07-1.47-.103-1.02-.124-1.49-.062-1.7.06-.213.228-.392.767-.911.407-.392.717-.723.935-1.05.218-.325.386-.693.276-1.11-.11-.416-.467-.657-.822-.794-.355-.137-.78-.217-1.31-.283-.833-.104-1.15-.169-1.3-.281-.15-.111-.343-.437-.743-1.25a7.138 7.138 0 0 0-.776-1.27 2.608 2.608 0 0 0-.405-.429C38.464.136 38.3.007 38 .007zm0 1.24c.042.044.073.07.126.137.192.245.428.627.648 1.07.4.814.612 1.31 1.09 1.66.473.351.997.391 1.83.495.488.06.849.14 1.04.214.194.075.154.1.135.029-.019-.071.014-.014-.122.188s-.401.5-.78.866c-.539.519-.912.86-1.07 1.41-.158.555-.077 1.1.024 2.12.06.589.083 1.03.067 1.29-.004.072-.012.088-.02.128.008-.01.047-.001-.137-.075-.264-.106-.672-.326-1.21-.64-.67-.39-1.07-.662-1.62-.662-.555 0-.954.272-1.62.663-.535.313-.945.533-1.21.639-.184.073-.145.065-.137.075-.008-.04-.016-.056-.02-.128-.017-.26.01-.704.068-1.29.102-1.02.182-1.56.025-2.12-.158-.555-.533-.896-1.07-1.41-.381-.367-.646-.67-.783-.873-.136-.204-.104-.263-.122-.197-.018.066-.054.04.14-.036.197-.076.556-.158 1.05-.219.839-.105 1.36-.146 1.84-.495.475-.349.685-.84 1.08-1.65.218-.442.453-.82.644-1.06.051-.065.082-.089.124-.133z"/>
+    </g>
+    <path fill="#169103" d="M43 6.7c-2.37 0-4.34 1.65-4.85 3.87h2.03c.458-1.13 1.54-1.94 2.82-1.94.692 0 1.23.154 1.77.541l-1.39 2.17H48v-4.65l-1.85 1.08c-.923-.698-2-1.08-3.15-1.08zm-5 4.65V16l1.85-1.08c.923.698 2 1.08 3.15 1.08 2.37 0 4.34-1.65 4.85-3.87h-2.03c-.458 1.13-1.54 1.94-2.82 1.94-.692 0-1.23-.154-1.77-.541l1.39-2.17z"/>
+  </g>
+</svg>
diff --git a/palemoon/themes/osx/places/organizer.css b/palemoon/themes/osx/places/organizer.css
index 611c0c00c..ffcd6c523 100644
--- a/palemoon/themes/osx/places/organizer.css
+++ b/palemoon/themes/osx/places/organizer.css
@@ -2,10 +2,24 @@
  * 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/. */
 
+:root {
+  --toolbarbutton-image: url("chrome://browser/skin/Toolbar.png");
+  --library-toolbar-image: url("chrome://browser/skin/places/libraryToolbar.png");
+}
+
+
+/* Use SVG for HiDPI 133%+ */
+@media (min-resolution: 1.33dppx) {
+  :root {
+    --toolbarbutton-image: url("chrome://browser/skin/Toolbar.svg");
+    --library-toolbar-image: url("chrome://browser/skin/places/libraryToolbar.svg");
+  }
+}
+
 /* Toolbar */
 #placesToolbar {
   padding: 3px;
-  -moz-padding-end: 6px;
+  padding-inline-end: 6px;
 }
 
 #placesToolbar > toolbarbutton[disabled] > .toolbarbutton-icon {
@@ -14,7 +28,7 @@
 
 #back-button,
 #forward-button {
-  list-style-image: url("chrome://browser/skin/Toolbar.png");
+  list-style-image: var(--toolbarbutton-image);
 }
 
 #back-button {
@@ -34,35 +48,23 @@
 #organizeButton, 
 #viewMenu, 
 #maintenanceButton {
-  list-style-image: url("chrome://browser/skin/places/libraryToolbar.png");
+  list-style-image: var(--library-toolbar-image);
 }
 
 /* organize button */
 #organizeButton {
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
-#organizeButton:hover,
-#organizeButton[open="true"] {
-  -moz-image-region: rect(16px, 16px, 32px, 0px);
-}
 
 /* view button */
 #viewMenu {
   -moz-image-region: rect(0px, 32px, 16px, 16px);
 }
-#viewMenu:hover,
-#viewMenu[open="true"] {
-  -moz-image-region: rect(16px, 32px, 32px, 16px);
-}
 
 /* maintenance button */
 #maintenanceButton {
   -moz-image-region: rect(0px, 48px, 16px, 32px);
 }
-#maintenanceButton:hover,
-#maintenanceButton[open="true"] {
-  -moz-image-region: rect(16px, 48px, 32px, 32px);
-}
 
 /* Root View */
 #placesView {
@@ -76,7 +78,7 @@
 }
 
 #infoBoxExpanderLabel {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 #searchFilter {
@@ -92,8 +94,8 @@
 }
 
 #clearDownloadsButton {
-  -moz-padding-start: 9px;
-  -moz-padding-end: 9px;
+  padding-inline-start: 9px;
+  padding-inline-end: 9px;
 }
 
 /* hover-over/open button highlighting */
diff --git a/palemoon/themes/osx/places/places.css b/palemoon/themes/osx/places/places.css
index 424377952..b30c56bd8 100644
--- a/palemoon/themes/osx/places/places.css
+++ b/palemoon/themes/osx/places/places.css
@@ -142,5 +142,5 @@ treechildren::-moz-tree-cell-text(cutting) {
 #viewButton > .button-box > .button-menu-dropmarker {
   height: auto;
   width: auto;
-  -moz-margin-end: -3px;
+  margin-inline-end: -3px;
 }
diff --git a/palemoon/themes/osx/preferences/applications.css b/palemoon/themes/osx/preferences/applications.css
index 80699b463..fdf561477 100644
--- a/palemoon/themes/osx/preferences/applications.css
+++ b/palemoon/themes/osx/preferences/applications.css
@@ -11,18 +11,18 @@
 .actionsMenu {
   margin-top: 0;
   margin-bottom: 0;
-  -moz-margin-start: -2px;
-  -moz-margin-end: 0;
+  margin-inline-start: -2px;
+  margin-inline-end: 0;
 }
 
 .typeIcon,
 .actionIcon {
-  -moz-margin-start: 3px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 3px;
+  margin-inline-end: 3px;
 }
 
 richlistitem label {
-  -moz-margin-start: 1px;
+  margin-inline-start: 1px;
   margin-top: 2px;
 }
 
@@ -51,14 +51,14 @@ menuitem[appHandlerIcon="plugin"] {
 }
 
 .actionsMenu .menulist-icon {
-  -moz-margin-end: 3px;
+  margin-inline-end: 3px;
 }
 
 .actionsMenu > menupopup > menuitem > .menu-iconic-left {
-  -moz-padding-start: 0px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 0px;
+  padding-inline-end: 2px;
 }
 
 .actionsMenu > menupopup > menuitem {
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
 }
diff --git a/palemoon/themes/osx/sanitizeDialog.css b/palemoon/themes/osx/sanitizeDialog.css
index 40dc4b251..2fbedeb76 100644
--- a/palemoon/themes/osx/sanitizeDialog.css
+++ b/palemoon/themes/osx/sanitizeDialog.css
@@ -3,12 +3,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #sanitizeDurationChoice {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 /* Align the duration label with the warning box and item list */
 #sanitizeDurationLabel {
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
 }
 
 
@@ -79,15 +79,15 @@
 
 /* Make the item list the same width as the warning box */
 #itemList {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 
 /* Align the last dialog button with the end of the warning box */
 .prefWindow-dlgbuttons {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 .dialog-button[dlgtype="cancel"] {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
diff --git a/palemoon/themes/osx/searchbar.css b/palemoon/themes/osx/searchbar.css
index 55fdfc4bd..e21101ba4 100644
--- a/palemoon/themes/osx/searchbar.css
+++ b/palemoon/themes/osx/searchbar.css
@@ -28,7 +28,7 @@
   min-width: 0;
   margin: 0;
   padding: 0;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
   -moz-box-align: center;
   background: none;
   border: none;
@@ -57,9 +57,9 @@
 }
 
 .search-go-button {
-  padding: 1px;
-  list-style-image: url("chrome://browser/skin/Search-glass.png");
-  -moz-image-region: rect(0px 16px 16px 0px);
+  padding: 2px 1px;
+  opacity: .4;
+  list-style-image: url("chrome://browser/skin/Search.png");
 }
 
 .search-go-button:-moz-locale-dir(rtl) {
@@ -67,11 +67,11 @@
 }
 
 .search-go-button:hover {
-  -moz-image-region: rect(0px 32px 16px 16px);
+  opacity: .6;
 }
 
 .search-go-button:hover:active {
-  -moz-image-region: rect(0px, 48px, 16px, 32px);
+  opacity: .8;
 }
 
 .searchbar-engine-menuitem[selected="true"] > .menu-iconic-text {
diff --git a/palemoon/themes/osx/statusbar/overlay.css b/palemoon/themes/osx/statusbar/overlay.css
index ab1cc8f93..d54334206 100644
--- a/palemoon/themes/osx/statusbar/overlay.css
+++ b/palemoon/themes/osx/statusbar/overlay.css
@@ -60,7 +60,7 @@
 toolbar[mode="icons"] #status4evar-download-button[forcelabel="true"] > label
 {
 	margin: 0px 2px !important;
-	-moz-margin-start: 3px !important;
+	margin-inline-start: 3px !important;
 }
 
 /*
diff --git a/palemoon/themes/osx/syncCommon.css b/palemoon/themes/osx/syncCommon.css
index f0beae0d5..838788cd5 100644
--- a/palemoon/themes/osx/syncCommon.css
+++ b/palemoon/themes/osx/syncCommon.css
@@ -8,7 +8,7 @@
 }
 
 .statusIcon {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   max-height: 16px;
   max-width: 16px;
 }
diff --git a/palemoon/themes/osx/syncSetup.css b/palemoon/themes/osx/syncSetup.css
index fff65e963..8898951eb 100644
--- a/palemoon/themes/osx/syncSetup.css
+++ b/palemoon/themes/osx/syncSetup.css
@@ -99,7 +99,7 @@ description > .text-link:focus {
 }
 
 .inputColumn {
-  -moz-margin-end: 2px
+  margin-inline-end: 2px
 }
 
 .pin {
diff --git a/palemoon/themes/osx/tabbrowser/newtab-glass.png b/palemoon/themes/osx/tabbrowser/newtab-glass.png
deleted file mode 100644
index 15185beb6..000000000
--- a/palemoon/themes/osx/tabbrowser/newtab-glass.png
+++ /dev/null
diff --git a/palemoon/themes/osx/tabbrowser/tab-arrow-left-glass.png b/palemoon/themes/osx/tabbrowser/tab-arrow-left-glass.png
deleted file mode 100644
index aac93a727..000000000
--- a/palemoon/themes/osx/tabbrowser/tab-arrow-left-glass.png
+++ /dev/null
diff --git a/palemoon/themes/shared/plugin-doorhanger.inc.css b/palemoon/themes/shared/plugin-doorhanger.inc.css
index bda08e4f6..798be2c1d 100644
--- a/palemoon/themes/shared/plugin-doorhanger.inc.css
+++ b/palemoon/themes/shared/plugin-doorhanger.inc.css
@@ -16,7 +16,7 @@
 }
 
 .center-item-label {
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   margin-bottom: 0;
   text-overflow: ellipsis;
 }
@@ -26,7 +26,7 @@
   background-repeat: no-repeat;
   width: 16px;
   height: 15px;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 .click-to-play-plugins-notification-button-container {
diff --git a/palemoon/themes/windows/aboutCertError.css b/palemoon/themes/windows/aboutCertError.css
index dbb353025..100bb3d3b 100644
--- a/palemoon/themes/windows/aboutCertError.css
+++ b/palemoon/themes/windows/aboutCertError.css
@@ -33,7 +33,7 @@ h2 {
   border-radius: 10px;
   box-shadow: 0px 0px 8px red;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   background: url("chrome://global/skin/icons/sslWarning.png") left 0 no-repeat -moz-Field;
   background-origin: content-box;
 }
@@ -43,16 +43,16 @@ h2 {
 }
 
 #errorTitle {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 #errorLongContent {
-  -moz-margin-start: 80px;
+  margin-inline-start: 80px;
 }
 
 .expander > button {
-  -moz-padding-start: 20px;
-  -moz-margin-start: -20px;
+  padding-inline-start: 20px;
+  margin-inline-start: -20px;
   background: url("chrome://browser/skin/aboutCertError_sectionExpanded.png") left center no-repeat;
   border: none;
   font: inherit;
diff --git a/palemoon/themes/windows/aboutPrivateBrowsing.css b/palemoon/themes/windows/aboutPrivateBrowsing.css
index cd6026b8e..35843adce 100644
--- a/palemoon/themes/windows/aboutPrivateBrowsing.css
+++ b/palemoon/themes/windows/aboutPrivateBrowsing.css
@@ -21,7 +21,7 @@ body.normal > #errorPageContainer {
 }
 
 #startPrivateBrowsingDesc > button {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #footerDesc > p {
@@ -30,7 +30,7 @@ body.normal > #errorPageContainer {
 
 #moreInfo {
   font-size: 110%; /* to match the value set in chrome://global/skin/netError.css */
-  -moz-padding-start: 25px;
+  padding-inline-start: 25px;
   background: url("chrome://global/skin/icons/information-16.png") no-repeat top left;
 }
 
diff --git a/palemoon/themes/windows/aboutSyncTabs.css b/palemoon/themes/windows/aboutSyncTabs.css
index 4f21a9d40..1fcd8304f 100644
--- a/palemoon/themes/windows/aboutSyncTabs.css
+++ b/palemoon/themes/windows/aboutSyncTabs.css
@@ -22,18 +22,18 @@
   margin-top: 4px;
   width: 45em;
   height: 32px;
-  -moz-margin-start: 2em;
-  -moz-margin-end: 2em;
+  margin-inline-start: 2em;
+  margin-inline-end: 2em;
 }
 
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;
-  -moz-margin-start: 40px;
+  margin-inline-start: 40px;
 }
 
 richlistitem {
-  -moz-margin-end: 2em;
+  margin-inline-end: 2em;
 }
 
 richlistitem[selected="true"],
@@ -46,7 +46,7 @@ richlistitem[type="tab"] {
   border: #999999 1px solid !important;
   padding: 2px 5px;
   margin-bottom: 4px;
-  -moz-margin-start: 4em;
+  margin-inline-start: 4em;
   border-radius: 6px;
   background-color: menu;
   width: 44em;
@@ -64,7 +64,7 @@ richlistitem[type="tab"][selected="true"] {
 richlistitem[type="client"] {
   min-height: 2em;
   color: #000000;
-  -moz-margin-start: 2em;
+  margin-inline-start: 2em;
   margin-top: 2px;
   margin-bottom: 3px;
   width: 42em;
@@ -96,6 +96,6 @@ richlistitem.desktop[type="client"] {
 }
 
 .tabIcon {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
   padding-top: 2px;
 }
diff --git a/palemoon/themes/windows/autocomplete.css b/palemoon/themes/windows/autocomplete.css
index b3cab44c8..dbdc3f6d4 100644
--- a/palemoon/themes/windows/autocomplete.css
+++ b/palemoon/themes/windows/autocomplete.css
@@ -74,7 +74,7 @@ panel[type="private-autocomplete-richlistbox"],
 }
 
 .private-autocomplete-treebody::-moz-tree-cell-text {
-  -moz-padding-start: 8px;
+  padding-inline-start: 8px;
 }
 
 treechildren.private-autocomplete-treebody::-moz-tree-row(selected) {
@@ -163,8 +163,8 @@ treechildren.private-autocomplete-treebody::-moz-tree-cell-text(selected) {
 .ac-type-icon {
   width: 16px; 
   height: 16px;
-  -moz-margin-start: 6px;
-  -moz-margin-end: 4px;
+  margin-inline-start: 6px;
+  margin-inline-end: 4px;
   margin-bottom: -1px;
 }
 
diff --git a/palemoon/themes/windows/browser.css b/palemoon/themes/windows/browser.css
index cb0456052..7fd567eb4 100644
--- a/palemoon/themes/windows/browser.css
+++ b/palemoon/themes/windows/browser.css
@@ -31,6 +31,9 @@
 %endif
 
 :root {
+  --fullscreen-background-color: #556;
+  --fullscreen-text-color: #fff;
+
   --toolbox-after-color: ThreeDShadow;
 
   --toolbar-custom-color: hsl(210,75%,92%);
@@ -285,12 +288,12 @@
   height: auto;
   padding: 0;
   margin: 0;
-  -moz-margin-start: .5em;
+  margin-inline-start: .5em;
 }
 
 .splitmenu-menuitem {
-  -moz-margin-end: 1px;
-  -moz-padding-end: 0.5em;
+  margin-inline-end: 1px;
+  padding-inline-end: 0.5em;
 }
 
 .splitmenu-menu {
@@ -310,7 +313,7 @@
 }
 
 #appmenuPrimaryPane {
-  -moz-border-end: 1px solid ThreeDShadow;
+  border-inline-end: 1px solid ThreeDShadow;
 }
 
 @media (-moz-windows-default-theme) {
@@ -322,13 +325,13 @@
   #appmenuPrimaryPane {
     background-color: rgba(255,255,255,0.5);
     padding: 2px;
-    -moz-border-end: none;
+    border-inline-end: none;
   }
   #appmenuSecondaryPane {
     background-color: #f1f5fb;
     box-shadow: 1px 0 2px rgb(204,214,234) inset;
-    -moz-padding-start: 3px;
-    -moz-padding-end: 2px;
+    padding-inline-start: 3px;
+    padding-inline-end: 2px;
     padding-top: 2px;
     padding-bottom: 2px;
     font-family: "Segoe UI Semibold", "Segoe UI", sans-serif;
@@ -446,7 +449,7 @@
     -moz-appearance: none;
     margin-top: 3px;
     margin-bottom: 3px;
-    -moz-margin-start: 30px;
+    margin-inline-start: 30px;
     padding: 0;
     border-top: 1px solid #d6e5f5;
     border-bottom: none;
@@ -454,17 +457,17 @@
 
   @media (min-resolution: 1.25dppx) {
     .appmenu-menuseparator {
-      -moz-margin-start: 25px;
+      margin-inline-start: 25px;
     }
   }
   @media (min-resolution: 1.5dppx) {
     .appmenu-menuseparator {
-      -moz-margin-start: 24px;
+      margin-inline-start: 24px;
     }
   }
   @media (min-resolution: 2dppx) {
     .appmenu-menuseparator {
-      -moz-margin-start: 22px;
+      margin-inline-start: 22px;
     }
   }
 
@@ -628,7 +631,7 @@
 
 @media not all and (-moz-windows-classic) {
   #titlebar-min {
-    -moz-margin-end: 2px;
+    margin-inline-end: 2px;
   }
 }
 
@@ -643,8 +646,8 @@ toolbarbutton.bookmark-item:hover:active:not([disabled="true"]),
 toolbarbutton.bookmark-item[open="true"] {
   padding-top: 3px;
   padding-bottom: 1px;
-  -moz-padding-start: 4px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 4px;
+  padding-inline-end: 2px;
 }
 
 .bookmark-item:not(#bookmarks-menu-button) > .toolbarbutton-icon {
@@ -684,7 +687,7 @@ menuitem.bookmark-item {
 }
 
 .bookmark-item > .menu-iconic-left > .menu-iconic-icon {
-  -moz-padding-start: 0px;
+  padding-inline-start: 0px;
 }
 
 /* ::::: bookmark items ::::: */
@@ -785,7 +788,7 @@ toolbar[brighttext] .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
 
 .toolbarbutton-1 > .toolbarbutton-icon,
 .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 toolbar[mode=full] .toolbarbutton-1:not([type=menu-button]) {
@@ -827,11 +830,11 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button {
-  -moz-padding-end: 0;
+  padding-inline-end: 0;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
-  -moz-padding-start: 0;
+  padding-inline-start: 0;
   -moz-box-align: center;
 }
 
@@ -866,15 +869,15 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
 
 @navbarLargeIcons@ .toolbarbutton-1[type=menu]:not(#back-button):not(#forward-button):not(#feed-button) > .toolbarbutton-icon,
 @navbarLargeIcons@ .toolbarbutton-1[type=menu] > .toolbarbutton-text /* hack for add-ons that forcefully display the label */ {
-  -moz-padding-end: 17px;
+  padding-inline-end: 17px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menu-dropmarker {
-  -moz-margin-start: -15px;
+  margin-inline-start: -15px;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
-  -moz-border-end: none;
+  border-inline-end: none;
 }
 
 @navbarLargeIcons@ .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker > .dropmarker-icon {
@@ -886,7 +889,7 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
   display: -moz-box;
   width: 1px;
   height: 18px;
-  -moz-margin-end: -1px;
+  margin-inline-end: -1px;
   background-image: linear-gradient(var(--toolbarbutton-border-color) 0, var(--toolbarbutton-border-color) 18px);
   background-clip: padding-box;
   background-position: center;
@@ -942,7 +945,7 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
 }
 
 @navbarLargeIcons@ .toolbarbutton-1:-moz-any(:hover,[open]) > .toolbarbutton-menubutton-dropmarker:not([disabled]) > .dropmarker-icon {
-  -moz-border-start-color: hsla(210,54%,20%,.35);
+  border-inline-start-color: hsla(210,54%,20%,.35);
 }
 
 @navbarLargeIcons@ .toolbarbutton-1[checked]:not(:active):hover > .toolbarbutton-icon {
@@ -1020,7 +1023,7 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
 
 @conditionalForwardWithUrlbar@ > #forward-button > .toolbarbutton-icon {
   clip-path: url(chrome://browser/content/browser.xul#windows-keyhole-forward-clip-path);
-  -moz-margin-start: -6px !important;
+  margin-inline-start: -6px !important;
   border-left-style: none;
   border-radius: 0;
   padding-left: 7px;
@@ -1048,8 +1051,8 @@ toolbar[mode=full] .toolbarbutton-1 > .toolbarbutton-menubutton-button {
   -moz-image-region: rect(18px, 20px, 38px, 0);
   padding-top: 3px;
   padding-bottom: 3px;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 0;
+  padding-inline-start: 5px;
+  padding-inline-end: 0;
   position: relative;
   z-index: 1;
   border-radius: 0 10000px 10000px 0;
@@ -1212,45 +1215,86 @@ toolbar[brighttext] #bookmarks-menu-button.bookmark-item {
 /* ::::: fullscreen window controls ::::: */
 
 #window-controls {
-  -moz-margin-start: 4px;
+  -moz-box-align: start;
+  /* Make sure the window controls are always last on the toolbar */
+  -moz-box-ordinal-group: 100;
+  margin-inline-start: 4px;
 }
 
 #minimize-button,
 #restore-button,
 #close-button {
+  -moz-appearance: none;
+  border-style: none;
   list-style-image: url("chrome://global/skin/icons/windowControls.png");
+  margin: 0;
   padding: 0;
 }
 
 #minimize-button {
   -moz-image-region: rect(0, 16px, 16px, 0);
 }
+
 #minimize-button:hover {
   -moz-image-region: rect(16px, 16px, 32px, 0);
 }
+
 #minimize-button:hover:active {
   -moz-image-region: rect(32px, 16px, 48px, 0);
 }
+
 #restore-button {
   -moz-image-region: rect(0, 32px, 16px, 16px);
 }
+
 #restore-button:hover {
   -moz-image-region: rect(16px, 32px, 32px, 16px);
 }
+
 #restore-button:hover:active {
   -moz-image-region: rect(32px, 32px, 48px, 16px);
 }
+
 #close-button {
-  -moz-image-region: rect(0, 48px, 16px, 32px);
-  -moz-appearance: none;
-  border-style: none;
-  margin: 2px;
+  -moz-image-region: rect(0, 49px, 16px, 32px);
 }
+
 #close-button:hover {
-  -moz-image-region: rect(16px, 48px, 32px, 32px);
+  -moz-image-region: rect(16px, 49px, 32px, 32px);
 }
+
 #close-button:hover:active {
-  -moz-image-region: rect(32px, 48px, 48px, 32px);
+  -moz-image-region: rect(32px, 49px, 48px, 32px);
+}
+
+#minimize-button:-moz-locale-dir(rtl),
+#restore-button:-moz-locale-dir(rtl),
+#close-button:-moz-locale-dir(rtl) {
+  transform: scaleX(-1);
+}
+
+@media (-moz-os-version: windows-win10) {
+  #window-controls {
+    margin-inline-start: 0;
+  }
+
+  #window-controls > toolbarbutton {
+    margin: 0;
+    padding: 2px 4px;
+    transition: background-color linear 120ms;
+  }
+
+  #minimize-button,
+  #restore-button,
+  #close-button,
+  #minimize-button:hover,
+  #restore-button:hover,
+  #close-button:hover,
+  #minimize-button:hover:active,
+  #restore-button:hover:active,
+  #close-button:hover:active {
+    -moz-image-region: auto;
+  }
 }
 
 /* ::::: Location Bar ::::: */
@@ -1267,7 +1311,7 @@ toolbar[brighttext] #bookmarks-menu-button.bookmark-item {
 
 #urlbar {
   width: 7em;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 @media (-moz-windows-default-theme) {
@@ -1286,13 +1330,13 @@ toolbar[brighttext] #bookmarks-menu-button.bookmark-item {
 
 @conditionalForwardWithUrlbar@ + #urlbar-container {
   padding-left: @conditionalForwardWithUrlbarWidth@px;
-  -moz-margin-start: -@conditionalForwardWithUrlbarWidth@px;
+  margin-inline-start: -@conditionalForwardWithUrlbarWidth@px;
   position: relative;
   pointer-events: none;
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar {
-  -moz-border-start: none;
+  border-inline-start: none;
   margin-left: 0;
   pointer-events: all;
 }
@@ -1342,7 +1386,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 }
 
 .urlbar-input-box {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
   min-width: 4em;
 }
 
@@ -1370,25 +1414,25 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 
 #urlbar-search-splitter {
   min-width: 6px;
-  -moz-margin-start: -3px;
+  margin-inline-start: -3px;
   border: none;
   background: transparent;
 }
 
 #urlbar-search-splitter + #urlbar-container > #urlbar ,
 #urlbar-search-splitter + #search-container > #searchbar > .searchbar-textbox {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 #urlbar-display-box {
-  -moz-border-end: 1px solid #AAA;
-  -moz-margin-end: 3px;
+  border-inline-end: 1px solid #AAA;
+  margin-inline-end: 3px;
 }
 
 #urlbar-display {
   margin-top: 0;
   margin-bottom: 0;
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
   color: GrayText;
 }
 
@@ -1410,7 +1454,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 }
 
 #notification-popup-box:not([hidden]) + #identity-box {
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
   border-radius: 0;
 }
 
@@ -1420,7 +1464,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedIdentity {
   color: hsl(92,100%,20%);
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   background-image: -moz-linear-gradient(hsla(92,81%,16%,0),
                                          hsla(92,81%,16%,.08) 25%,
                                          hsla(92,81%,16%,.08) 75%,
@@ -1432,7 +1476,7 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 
 #urlbar[pageproxystate="valid"] > #identity-box.verifiedDomain {
   color: rgb(0,79,168);
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   background-image: -moz-linear-gradient(rgba(0,79,168,0),
                                          rgba(0,79,168,.08) 25%,
                                          rgba(0,79,168,.08) 75%,
@@ -1460,8 +1504,8 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
 }
 
 #identity-icon-labels {
-  -moz-padding-start: 2px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 2px;
+  padding-inline-end: 5px;
 }
 
 /* Address bar shading for SSL */
@@ -1540,14 +1584,14 @@ html|*.urlbar-input:-moz-lwtheme::-moz-placeholder,
   height: 16px;
   margin-top: 1px;
   margin-bottom: 1px;
-  -moz-margin-start: 3px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 3px;
+  margin-inline-end: 2px;
   list-style-image: url(chrome://browser/skin/identity-icons-generic.png);
   -moz-image-region: rect(0, 16px, 16px, 0);
 }
 
 @conditionalForwardWithUrlbar@ + #urlbar-container > #urlbar > #identity-box > #page-proxy-favicon {
-  -moz-margin-end: 1px;
+  margin-inline-end: 1px;
 }
 
 /* Since we already have a padlock, always use the generic icon until the favicon loads
@@ -1796,7 +1840,7 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 }
 
 #sidebar-title {
-  -moz-padding-start: 0px;
+  padding-inline-start: 0px;
 }
 
 /* ::::: throbber ::::: */
@@ -1874,12 +1918,12 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   /* Hide the transparent top border by default */
   margin-top: -1px;
   /* Reduce the gap between the tabs */
-  -moz-margin-start: -1px;
+  margin-inline-start: -1px;
   box-shadow: var(--tab-box-shadow);
 }
 
 .tabbrowser-tab {
-  -moz-padding-end: 3px;
+  padding-inline-end: 3px;
 }
 
 /* Override the default (globally-set) tab width values; increase
@@ -1996,8 +2040,8 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   width: 16px;
   height: 16px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
-  -moz-margin-start: 2px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 2px;
+  margin-inline-end: 3px;
 }
 
 .tab-throbber {
@@ -2010,8 +2054,8 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 
 .tab-throbber[pinned],
 .tab-icon-image[pinned] {
-  -moz-margin-start: 5px;
-  -moz-margin-end: 5px;
+  margin-inline-start: 5px;
+  margin-inline-end: 5px;
 }
 
 /* tabbrowser-tab focus ring */
@@ -2042,7 +2086,7 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
 
 /* Tab sound indicator */
 .tab-icon-sound {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   width: 16px;
   height: 16px;
   padding: 0;
@@ -2273,9 +2317,9 @@ toolbar[brighttext] .tabs-closebutton {
 }
 
 .tabs-closebutton > .toolbarbutton-icon {
-  -moz-margin-end: 0px !important;
-  -moz-padding-end: 2px !important;
-  -moz-padding-start: 2px !important;
+  margin-inline-end: 0px !important;
+  padding-inline-end: 2px !important;
+  padding-inline-start: 2px !important;
 }
 
 toolbarbutton.chevron {
@@ -2301,7 +2345,7 @@ toolbar[mode="text"] toolbarbutton.chevron > .toolbarbutton-icon {
 
 #sidebar-throbber[loading="true"] {
   list-style-image: url("chrome://global/skin/icons/loading_16.png");
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
 }
 
 /* Pale Moon: Feed icon */
@@ -2353,7 +2397,7 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 .menupopup-drop-indicator {
   list-style-image: none;
   height: 2px;
-  -moz-margin-end: -4em;
+  margin-inline-end: -4em;
   background-color: Highlight;
 }
 
@@ -2379,13 +2423,13 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 /* Popup Body Text */
 .identity-popup-description {
   white-space: pre-wrap;
-  -moz-padding-start: 15px;
+  padding-inline-start: 15px;
   margin: 2px 0 4px;
 }
 
 .identity-popup-label {
   white-space: pre-wrap;
-  -moz-padding-start: 15px;
+  padding-inline-start: 15px;
   margin: 0;
 }
 
@@ -2419,7 +2463,7 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption ,
 #identity-popup-content-box.verifiedDomain > #identity-popup-encryption {
   margin-top: 10px;
-  -moz-margin-start: -24px;
+  margin-inline-start: -24px;
 }
 
 #identity-popup-content-box.verifiedIdentity > #identity-popup-encryption > vbox > #identity-popup-encryption-icon ,
@@ -2430,13 +2474,13 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 #identity-popup-more-info-button {
   margin-top: 6px;
   margin-bottom: 0;
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 .popup-notification-icon {
   width: 64px;
   height: 64px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .popup-notification-icon[popupid="geolocation"] {
@@ -2470,8 +2514,8 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 
 .popup-progress-label,
 .popup-progress-meter {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 .popup-progress-cancel {
@@ -2530,7 +2574,7 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
   border-width: 0 8px 0 0;
   border-style: solid;
   border-image: url("chrome://browser/skin/urlbar-arrow.png") 0 8 0 0 fill;
-  -moz-margin-end: -8px;
+  margin-inline-end: -8px;
 }
 
 @conditionalForwardWithUrlbar@[forwarddisabled] + #urlbar-container > #urlbar > #notification-popup-box {
@@ -2792,8 +2836,8 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
 }
 
 #allTabs-filter {
-  -moz-margin-start: 24px;
-  -moz-margin-end: 0;
+  margin-inline-start: 24px;
+  margin-inline-end: 0;
 }
 
 #allTabs-tab-close-button > .toolbarbutton-icon {
@@ -2811,10 +2855,10 @@ toolbarbutton.bookmark-item[dragover="true"][open="true"] {
   height: 22px;
   padding-top: 1px;
   padding-bottom: 5px;
-  -moz-padding-start: 1px;
-  -moz-padding-end: 5px;
+  padding-inline-start: 1px;
+  padding-inline-end: 5px;
   margin-top: -2px;
-  -moz-margin-start: -2px;
+  margin-inline-start: -2px;
   border-bottom-right-radius: 4px;
 }
 
@@ -2940,7 +2984,7 @@ toolbar[brighttext] #addonbar-closebutton {
   text-shadow: none;
   background-image: linear-gradient(#B4211B, #8A1915);
   border-radius: 1px;
-  -moz-margin-end: 5px;
+  margin-inline-end: 5px;
 }
 %endif
 
@@ -2961,7 +3005,7 @@ toolbar[brighttext] #addonbar-closebutton {
 }
 
 .toolbarbutton-badge-stack > .toolbarbutton-icon[label]:not([label=""]) {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 @navbarLargeIcons@ *|* > .toolbarbutton-badge[badge]:not([badge=""])::after {
@@ -3018,7 +3062,7 @@ toolbar[brighttext] #addonbar-closebutton {
 
   #appmenu-popup {
     margin-top: -1px;
-    -moz-margin-start: 1px;
+    margin-inline-start: 1px;
   }
 
   .panel-promo-message {
@@ -3090,19 +3134,19 @@ toolbar[brighttext] #addonbar-closebutton {
 
   .sidebar-splitter {
     border: 0;
-    -moz-border-end: 1px solid #A9B7C9;
+    border-inline-end: 1px solid #A9B7C9;
     min-width: 0;
     width: 3px;
     background-color: transparent;
-    -moz-margin-start: -3px;
+    margin-inline-start: -3px;
     position: relative;
   }
 
   #appcontent ~ .sidebar-splitter {
-    -moz-border-start: 1px solid #A9B7C9;
-    -moz-border-end: none;
-    -moz-margin-start: 0;
-    -moz-margin-end: -3px;
+    border-inline-start: 1px solid #A9B7C9;
+    border-inline-end: none;
+    margin-inline-start: 0;
+    margin-inline-end: -3px;
   }
 
   .menu-accel,
@@ -3143,7 +3187,8 @@ toolbar[brighttext] #addonbar-closebutton {
         --window-text-color: black;
       }
       
-      #titlebar-min:not(:-moz-window-inactive):not(:-moz-lwtheme) {
+      #titlebar-min:not(:-moz-window-inactive):not(:-moz-lwtheme),
+      #minimize-button:not(:-moz-lwtheme) {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#minimize);
       }
 
@@ -3151,29 +3196,35 @@ toolbar[brighttext] #addonbar-closebutton {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#maximize);
       }
 
-      #main-window[sizemode="maximized"] #titlebar-max:not(:-moz-window-inactive):not(:-moz-lwtheme) {
+      #main-window[sizemode="maximized"] #titlebar-max:not(:-moz-window-inactive):not(:-moz-lwtheme),
+      #restore-button:not(:-moz-lwtheme) {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#restore);
       }
       
-      #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme) {
+      #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme),
+      #close-button:not(:-moz-lwtheme) {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#close);
       }
 
-      .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover {
+      .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover,
+      #window-controls > toolbarbutton:not(#close-button):not(:-moz-lwtheme):hover {
         background-color: hsla(0, 0%, 0%, .17);
       }
 
-      .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active	{
+      .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active,
+      #window-controls > toolbarbutton:not(#close-button):not(:-moz-lwtheme):hover:active	{
         background-color: hsla(0, 0%, 0%, .27);
         transition: none;
       }
       
-      #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover {
+      #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover,
+      #close-button:not(:-moz-lwtheme):hover {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-highlight);
         background-color: hsla(0, 86%, 49%, 1);
       }
 
-      #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active	{
+      #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active,
+      #close-button:not(:-moz-lwtheme):hover:active	{
         background-color: hsla(0, 60%, 49%, 0.6);
         transition: none;
       }
@@ -3188,8 +3239,14 @@ toolbar[brighttext] #addonbar-closebutton {
       :root:not(:-moz-window-inactive):not(:-moz-lwtheme) {
         --window-text-color: -moz-win-accentcolortext;
       }
+
+      #main-window[sizemode=fullscreen]:not(:-moz-lwtheme) {
+        --fullscreen-background-color: -moz-win-accentcolor;
+        --fullscreen-text-color: -moz-win-accentcolortext;
+      }
       
-      #titlebar-min {
+      #titlebar-min,
+      #minimize-button {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#minimize);
       }
 
@@ -3197,26 +3254,31 @@ toolbar[brighttext] #addonbar-closebutton {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#maximize);
       }
 
-      #main-window[sizemode="maximized"] #titlebar-max {
+      #main-window[sizemode="maximized"] #titlebar-max,
+      #restore-button {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#restore);
       }
 
-      #titlebar-close {
+      #titlebar-close,
+      #close-button {
         list-style-image: url(chrome://browser/skin/caption-buttons.svg#close);
       }
       
-      .titlebar-button:hover {
+      .titlebar-button:hover,
+      #window-controls > toolbarbutton:not(#close-button):hover {
         background-color: hsla(0, 0%, 0%, .17);
       }
 
-      .titlebar-button:hover:active {
+      .titlebar-button:hover:active,
+      #window-controls > toolbarbutton:not(#close-button):hover:active {
         background-color: hsla(0, 0%, 0%, .27);
         transition: none;
       }
       
       @media (-moz-windows-accent-color-is-dark) {
         /* dark accent color */
-        #titlebar-min {
+        #titlebar-min,
+        #minimize-button {
           list-style-image: url(chrome://browser/skin/caption-buttons.svg#minimize-highlight);
         }
 
@@ -3224,7 +3286,8 @@ toolbar[brighttext] #addonbar-closebutton {
           list-style-image: url(chrome://browser/skin/caption-buttons.svg#maximize-highlight);
         }
 
-        #main-window[sizemode="maximized"] #titlebar-max {
+        #main-window[sizemode="maximized"] #titlebar-max,
+        #restore-button {
           list-style-image: url(chrome://browser/skin/caption-buttons.svg#restore-highlight);
         }
 
@@ -3232,20 +3295,24 @@ toolbar[brighttext] #addonbar-closebutton {
           list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-highlight);
         }
       
-        .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover {
+        .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover,
+        #window-controls > toolbarbutton:not(#close-button):not(:-moz-lwtheme):hover {
           background-color: hsla(0, 0%, 100%, .17);
         }
 
-        .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active	{
+        .titlebar-button:not(#titlebar-close):not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active,
+        #window-controls > toolbarbutton:not(#close-button):not(:-moz-lwtheme):hover:active	{
           background-color: hsla(0, 0%, 100%, .27);
           transition: none;
         }
       
-        #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover {
+        #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover,
+        #close-button:not(:-moz-lwtheme):hover {
           background-color: hsla(0, 86%, 49%, 1);
         }
 
-        #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active	{
+        #titlebar-close:not(:-moz-window-inactive):not(:-moz-lwtheme):hover:active,
+        #close-button:not(:-moz-lwtheme):hover:active {
           background-color: hsla(0, 60%, 39%, 1);
           transition: none;
         }
@@ -3301,13 +3368,15 @@ toolbar[brighttext] #addonbar-closebutton {
       padding-right: 19px;
     }
     
-    #titlebar-close:hover {
+    #titlebar-close:hover,
+    #close-button:hover {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-highlight);
       background-color: hsla(0, 86%, 49%, 1);
       transition: background-color linear 160ms;
     }
 
-    #titlebar-close:hover:active {
+    #titlebar-close:hover:active,
+    #close-button:hover:active {
       background-color: hsla(0, 86%, 49%, 0.6); 
       transition: none;
     }
@@ -3341,16 +3410,19 @@ toolbar[brighttext] #addonbar-closebutton {
     
     /* light persona */
     
-    .titlebar-button:-moz-lwtheme-darktext:hover {
+    .titlebar-button:-moz-lwtheme-darktext:hover,
+    #window-controls > toolbarbutton:not(#close-button):-moz-lwtheme-darktext:hover {
       background-color: hsla(0, 0%, 0%, .17);
     }
 
-    .titlebar-button:-moz-lwtheme-darktext:hover:active {
+    .titlebar-button:-moz-lwtheme-darktext:hover:active,
+    #window-controls > toolbarbutton:not(#close-button):-moz-lwtheme-darktext:hover:active {
       background-color: hsla(0, 0%, 0%, .27);
       transition: none;
     }
     
-    #titlebar-min:-moz-lwtheme-darktext {
+    #titlebar-min:-moz-lwtheme-darktext,
+    #minimize-button:-moz-lwtheme-darktext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#minimize-outline);
     }
 
@@ -3358,29 +3430,35 @@ toolbar[brighttext] #addonbar-closebutton {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#maximize-outline);
     }
 
-    #main-window[sizemode="maximized"]:-moz-lwtheme-darktext #titlebar-max:-moz-lwtheme-darktext {
+    #main-window[sizemode="maximized"]:-moz-lwtheme-darktext #titlebar-max:-moz-lwtheme-darktext,
+    #restore-button:-moz-lwtheme-darktext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#restore-outline);
     }
 
-    #titlebar-close:-moz-lwtheme-darktext {
+    #titlebar-close:-moz-lwtheme-darktext,
+    #close-button:-moz-lwtheme-darktext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-outline);
     }
-    #titlebar-close:hover:-moz-lwtheme-darktext {
+    #titlebar-close:hover:-moz-lwtheme-darktext,
+    #close-button:hover:-moz-lwtheme-darktext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-outline);
     }
         
     /* dark persona */
     
-    .titlebar-button:-moz-lwtheme-brighttext:hover {
+    .titlebar-button:-moz-lwtheme-brighttext:hover,
+    #window-controls > toolbarbutton:not(#close-button):-moz-lwtheme-brighttext:hover {
       background-color: hsla(0, 0%, 100%, .27);
     }
 
-    .titlebar-button:-moz-lwtheme-brighttext:hover:active {
+    .titlebar-button:-moz-lwtheme-brighttext:hover:active,
+    #window-controls > toolbarbutton:not(#close-button):-moz-lwtheme-brighttext:hover:active {
       background-color: hsla(0, 0%, 100%, .37);
       transition: none;
     }
     
-    #titlebar-min:-moz-lwtheme-brighttext {
+    #titlebar-min:-moz-lwtheme-brighttext,
+    #minimize-button:-moz-lwtheme-brighttext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#minimize-outline-inverted);
     }
 
@@ -3388,14 +3466,17 @@ toolbar[brighttext] #addonbar-closebutton {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#maximize-outline-inverted);
     }
 
-    #main-window[sizemode="maximized"]:-moz-lwtheme-brighttext #titlebar-max:-moz-lwtheme-brighttext {
+    #main-window[sizemode="maximized"]:-moz-lwtheme-brighttext #titlebar-max:-moz-lwtheme-brighttext,
+    #restore-button:-moz-lwtheme-brighttext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#restore-outline-inverted);
     }
 
-    #titlebar-close:-moz-lwtheme-brighttext {
+    #titlebar-close:-moz-lwtheme-brighttext,
+    #close-button:-moz-lwtheme-brighttext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-outline-inverted);
     }
-    #titlebar-close:hover:-moz-lwtheme-brighttext {
+    #titlebar-close:hover:-moz-lwtheme-brighttext,
+    #close-button:hover:-moz-lwtheme-brighttext {
       list-style-image: url(chrome://browser/skin/caption-buttons.svg#close-outline-inverted);
     }
         
@@ -3550,8 +3631,9 @@ toolbar[brighttext] #addonbar-closebutton {
 /* ==== ==== */
 
   #main-window[sizemode=fullscreen]:not(:-moz-lwtheme) {
+    --window-text-color: var(--fullscreen-text-color);
     -moz-appearance: none;
-    background-color: #556;
+    background-color: var(--fullscreen-background-color);
   }
 
   #toolbar-menubar:not(:-moz-lwtheme),
@@ -3756,35 +3838,6 @@ toolbar[brighttext] #addonbar-closebutton {
   }
 }
 
-/* ::::: fullscreen window controls ::::: */
-
-#window-controls {
-  -moz-box-align: start;
-}
-
-#minimize-button,
-#restore-button,
-#close-button {
-  -moz-appearance: none;
-  border-style: none;
-  margin: 0;
-}
-#close-button {
-  -moz-image-region: rect(0, 49px, 16px, 32px);
-}
-#close-button:hover {
-  -moz-image-region: rect(16px, 49px, 32px, 32px);
-}
-#close-button:hover:active {
-  -moz-image-region: rect(32px, 49px, 48px, 32px);
-}
-
-#minimize-button:-moz-locale-dir(rtl),
-#restore-button:-moz-locale-dir(rtl),
-#close-button:-moz-locale-dir(rtl) {
-  transform: scaleX(-1);
-}
-
 /* ::::: splitmenu highlight style that imitates Windows 7 start menu ::::: */
 @media (-moz-os-version: windows-vista) and (-moz-windows-default-theme),
        (-moz-os-version: windows-win7) and (-moz-windows-default-theme) {
@@ -3796,10 +3849,10 @@ toolbar[brighttext] #addonbar-closebutton {
     border: 1px solid transparent;
   }
   .splitmenu-menuitem {
-    -moz-margin-end: 0;
+    margin-inline-end: 0;
   }
   .splitmenu-menu {
-    -moz-margin-start: -1px;
+    margin-inline-start: -1px;
   }
   .splitmenu-menuitem:-moz-locale-dir(ltr),
   .splitmenu-menu:-moz-locale-dir(rtl) {
@@ -3813,11 +3866,11 @@ toolbar[brighttext] #addonbar-closebutton {
   }
 
   .splitmenu-menuitem > .menu-text {
-    -moz-margin-start: 1px !important;
-    -moz-margin-end: 3px !important;
+    margin-inline-start: 1px !important;
+    margin-inline-end: 3px !important;
   }
   .splitmenu-menu > .menu-right {
-    -moz-margin-end: -3px;
+    margin-inline-end: -3px;
   }
 
   .splitmenu-menuitem[iconic],
@@ -3827,11 +3880,11 @@ toolbar[brighttext] #addonbar-closebutton {
   .splitmenu-menuitem[iconic] > .menu-iconic-left {
     margin-top: -3px;
     margin-bottom: -2px;
-    -moz-margin-start: -1px;
+    margin-inline-start: -1px;
   }
   .splitmenu-menuitem[iconic] > .menu-iconic-text {
-    -moz-margin-start: 2px !important;
-    -moz-margin-end: 3px !important;
+    margin-inline-start: 2px !important;
+    margin-inline-end: 3px !important;
   }
   .splitmenu-menu[iconic] > .menu-right {
     margin-top: -1px;
diff --git a/palemoon/themes/windows/downloads/allDownloadsViewOverlay.css b/palemoon/themes/windows/downloads/allDownloadsViewOverlay.css
index bd3b7899d..3b8e43bc8 100644
--- a/palemoon/themes/windows/downloads/allDownloadsViewOverlay.css
+++ b/palemoon/themes/windows/downloads/allDownloadsViewOverlay.css
@@ -13,8 +13,8 @@
 }
 
 .downloadTypeIcon {
-  -moz-margin-start: 8px;
-  -moz-margin-end: 8px;
+  margin-inline-start: 8px;
+  margin-inline-end: 8px;
   /* explicitly size the icon, so size doesn't vary on hidpi systems */
   height: 32px;
   width: 32px;
diff --git a/palemoon/themes/windows/downloads/downloads.css b/palemoon/themes/windows/downloads/downloads.css
index f16989655..040f89071 100644
--- a/palemoon/themes/windows/downloads/downloads.css
+++ b/palemoon/themes/windows/downloads/downloads.css
@@ -88,7 +88,7 @@
 #downloadsSummary,
 richlistitem[type="download"] {
   height: 7em;
-  -moz-padding-end: 0;
+  padding-inline-end: 0;
   color: inherit;
 }
 
@@ -143,7 +143,7 @@ richlistitem[type="download"]:first-child {
 }
 
 .downloadTypeIcon {
-  -moz-margin-end: 8px;
+  margin-inline-end: 8px;
   /* Prevent flickering when changing states. */
   height: 32px;
   width: 32px;
@@ -465,7 +465,7 @@ toolbar[brighttext] #downloads-indicator-counter {
   background-image: linear-gradient(#505050, #575757);
   border: 1px solid;
   border-color: hsla(0,0%,0%,.6) hsla(0,0%,0%,.4) hsla(0,0%,0%,.4);
-  -moz-border-start: none;
+  border-inline-start: none;
   border-radius: 0 2px 2px 0;
 }
 
diff --git a/palemoon/themes/windows/engineManager.css b/palemoon/themes/windows/engineManager.css
index 18817cd4f..c6d42cce2 100644
--- a/palemoon/themes/windows/engineManager.css
+++ b/palemoon/themes/windows/engineManager.css
@@ -5,8 +5,8 @@
 %endif
 
 #engineList treechildren::-moz-tree-image(engineName) {
-  -moz-margin-end: 4px;
-  -moz-margin-start: 1px;
+  margin-inline-end: 4px;
+  margin-inline-start: 1px;
   width: 16px;
   height: 16px;
 }
diff --git a/palemoon/themes/windows/feeds/subscribe-ui.css b/palemoon/themes/windows/feeds/subscribe-ui.css
index 8ca53283b..f21c037e6 100644
--- a/palemoon/themes/windows/feeds/subscribe-ui.css
+++ b/palemoon/themes/windows/feeds/subscribe-ui.css
@@ -7,17 +7,17 @@
 }
 
 .handlersMenuPopup > menuitem {
-  -moz-padding-start: 23px;
+  padding-inline-start: 23px;
 }
 
 .handlersMenuPopup > menuitem.menuitem-iconic {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 .handlersMenuPopup > .menuitem-iconic  > .menu-iconic-left {
   display: -moz-box;
   min-width: 16px;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
 }
 
 .chooseApplicationMenuItem {
diff --git a/palemoon/themes/windows/feeds/subscribe.css b/palemoon/themes/windows/feeds/subscribe.css
index dc9304b8a..d6247569b 100644
--- a/palemoon/themes/windows/feeds/subscribe.css
+++ b/palemoon/themes/windows/feeds/subscribe.css
@@ -10,7 +10,7 @@ html {
 #feedBody {
   border: 1px solid THreeDShadow;
   padding: 3em;
-  -moz-padding-start: 30px;
+  padding-inline-start: 30px;
   margin: 2em auto;
   background: -moz-Field;
 }
@@ -25,9 +25,9 @@ html {
 #feedHeader {  
   margin-top: 4.9em;
   margin-bottom: 1em;
-  -moz-margin-start: 1.4em;
-  -moz-margin-end: 1em;
-  -moz-padding-start: 2.9em;
+  margin-inline-start: 1.4em;
+  margin-inline-end: 1em;
+  padding-inline-start: 2.9em;
   font-size: 110%;
   color: InfoText;
 }
@@ -54,12 +54,12 @@ html {
 
 #feedHeader[firstrun="true"] #feedIntroText {
   padding-top: 0.1em;
-  -moz-padding-start: 0.6em;
+  padding-inline-start: 0.6em;
   display: block;
 }
 
 #feedHeader[firstrun="true"] > #feedSubscribeLine {
-  -moz-padding-start: 1.8em;
+  padding-inline-start: 1.8em;
 }
 
 #feedSubscribeLine {
@@ -99,8 +99,8 @@ h2 {
 
 #feedTitleLink {
   float: right;
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
 }
@@ -110,15 +110,15 @@ a[href] img {
 }
 
 #feedTitleContainer {
-  -moz-margin-start: 0;
-  -moz-margin-end: .6em;
+  margin-inline-start: 0;
+  margin-inline-end: .6em;
   margin-top: 0;
   margin-bottom: 0;
 }
 
 #feedTitleImage {
-  -moz-margin-start: .6em;
-  -moz-margin-end: 0;
+  margin-inline-start: .6em;
+  margin-inline-end: 0;
   margin-top: 0;
   margin-bottom: 0;
   max-width: 300px;
diff --git a/palemoon/themes/windows/jar.mn b/palemoon/themes/windows/jar.mn
index 4422bb666..f90de60a1 100644
--- a/palemoon/themes/windows/jar.mn
+++ b/palemoon/themes/windows/jar.mn
@@ -112,6 +112,7 @@ browser.jar:
   skin/classic/browser/places/toolbarDropMarker.png                   (places/toolbarDropMarker.png)
   skin/classic/browser/places/editBookmarkOverlay.css                 (places/editBookmarkOverlay.css)
   skin/classic/browser/places/libraryToolbar.png                      (places/libraryToolbar.png)
+  skin/classic/browser/places/libraryToolbar.svg                      (places/libraryToolbar.svg)
   skin/classic/browser/places/starred48.png                           (places/starred48.png)
   skin/classic/browser/places/unstarred48.png                         (places/unstarred48.png)
   skin/classic/browser/places/tag.png                                 (places/tag.png)
diff --git a/palemoon/themes/windows/pageInfo.css b/palemoon/themes/windows/pageInfo.css
index ec65cc408..3bbfc933b 100644
--- a/palemoon/themes/windows/pageInfo.css
+++ b/palemoon/themes/windows/pageInfo.css
@@ -6,7 +6,7 @@
 
 /* View buttons */
 #viewGroup {
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
 }
 
 #viewGroup > radio {
@@ -31,7 +31,7 @@
 
 #topBar {
   border-bottom: 2px groove ThreeDFace;
-  -moz-padding-start: 10px;
+  padding-inline-start: 10px;
   background-color: -moz-Field;
   color: -moz-FieldText;
 }
@@ -98,7 +98,7 @@ textbox {
 }
 
 textbox.header {
-  -moz-margin-start: 0;
+  margin-inline-start: 0;
 }
 
 .iframe {
@@ -121,8 +121,8 @@ groupbox.collapsable caption .caption-icon {
   height: 9px;
   background-repeat: no-repeat;
   background-position: center;
-  -moz-margin-start: 2px;
-  -moz-margin-end: 2px;
+  margin-inline-start: 2px;
+  margin-inline-end: 2px;
   background-image: url("chrome://global/skin/tree/twisty.svg#open");
 }
 
@@ -142,7 +142,7 @@ groupbox tree {
 }
 
 #securityBox description { 
-  -moz-margin-start: 10px;
+  margin-inline-start: 10px;
 }
 
 #general-security-identity {
@@ -197,8 +197,8 @@ treechildren::-moz-tree-cell-text(broken) {
 #feedListbox richlistitem {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
@@ -235,8 +235,8 @@ treechildren::-moz-tree-cell-text(broken) {
 .permission {
   padding-top: 6px;
   padding-bottom: 6px;
-  -moz-padding-start: 7px;
-  -moz-padding-end: 7px;
+  padding-inline-start: 7px;
+  padding-inline-end: 7px;
   min-height: 25px;
   border-bottom: 1px dotted #C0C0C0;
 }
diff --git a/palemoon/themes/windows/permissions/aboutPermissions.css b/palemoon/themes/windows/permissions/aboutPermissions.css
index 60ee81673..d3ceed756 100644
--- a/palemoon/themes/windows/permissions/aboutPermissions.css
+++ b/palemoon/themes/windows/permissions/aboutPermissions.css
@@ -43,7 +43,7 @@
 .site-favicon {
   height: 16px;
   width: 16px;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
@@ -60,7 +60,7 @@
 
 #site-description {
   font-size: 125%;
-  -moz-margin-start: 6px; /* to match button margin */
+  margin-inline-start: 6px; /* to match button margin */
 }
 
 #site-label {
@@ -72,7 +72,7 @@
 #defaults-description {
   font-size: 125%;
   font-weight: bold;
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
 }
 
 .pref-item {
@@ -82,7 +82,7 @@
 .pref-icon {
   width: 48px;
   height: 48px;
-  -moz-margin-end: 10px;
+  margin-inline-end: 10px;
 }
 
 .pref-icon[type="password"] {
diff --git a/palemoon/themes/windows/places/editBookmarkOverlay.css b/palemoon/themes/windows/places/editBookmarkOverlay.css
index be3ea83f4..3d67cd3f4 100644
--- a/palemoon/themes/windows/places/editBookmarkOverlay.css
+++ b/palemoon/themes/windows/places/editBookmarkOverlay.css
@@ -24,7 +24,7 @@
 .expander-down {
   min-width: 0;
   margin: 0;
-  -moz-margin-end: 4px;
+  margin-inline-end: 4px;
 }
 
 .expander-up > .button-box,
diff --git a/palemoon/themes/windows/places/libraryToolbar.svg b/palemoon/themes/windows/places/libraryToolbar.svg
new file mode 100644
index 000000000..5fcf42ae3
--- /dev/null
+++ b/palemoon/themes/windows/places/libraryToolbar.svg
@@ -0,0 +1,41 @@
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="48" height="16" viewBox="0 0 48 16">
+  <defs>
+    <linearGradient id="starGradient" x1="24.5" x2="24.5" y1="1081" y2="1121" gradientTransform="matrix(.318 0 0 .317 30.2 -342)" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#f9f3ac"/>
+      <stop offset="1" stop-color="#ffdc46"/>
+    </linearGradient>
+    <linearGradient id="fileGradient" x1="5" x2="5" y1=".842" y2="9.16" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#fff"/>
+      <stop offset="1" stop-color="#e3f1fc"/>
+    </linearGradient>
+  </defs>
+  <g id="file">
+    <use width="100%" height="100%" transform="translate(6 6)" xlink:href="#file-individual"/>
+    <use width="100%" height="100%" transform="translate(4 4)" xlink:href="#file-individual"/>
+    <use width="100%" height="100%" transform="translate(2 2)" xlink:href="#file-individual"/>
+    <g id="file-individual">
+      <path fill="url(#fileGradient)" d="M1 0h8v10H1z"/>
+      <path fill="#9c9c9c" d="M1 0v10h8V0zm1 1h6v8H2z"/>
+    </g>
+  </g>
+  <g id="view">
+    <path fill="#a7dd8c" d="M17 2v1h2V2z"/>
+    <path fill="#eaedf4" d="M20 2v1h7V2zm8 0v1h3V2zm-8 2v1h7V4zm8 0v1h3V4zm-8 2v1h7V6zm8 0v1h3V6zm-8 3v1h7V9zm8 0v1h3V9zm-8 2v1h7v-1zm8 0v1h3v-1zm-8 2v1h7v-1zm8 0v1h3v-1z"/>
+    <path fill-opacity=".3" d="M17 3v1h2V3zm3 0v1h7V3zm8 0v1h3V3zM17 5v1h2V5zm3 0v1h7V5zm8 0v1h3V5zM17 7v1h2V7zm3 0v1h7V7zm8 0v1h3V7zm-11 3v1h2v-1zm3 0v1h7v-1zm8 0v1h3v-1zm-11 2v1h2v-1zm3 0v1h7v-1zm8 0v1h3v-1zm-11 2v1h2v-1zm3 0v1h7v-1zm8 0v1h3v-1z"/>
+    <path fill="#c5a2ec" d="M17 4v1h2V4z"/>
+    <path fill="#ec8e8e" d="M17 6v1h2V6z"/>
+    <path fill="#8ebbec" d="M17 9v1h2V9z"/>
+    <path fill="#a7dd8c" d="M17 11v1h2v-1z"/>
+    <path fill="#fac090" d="M17 13v1h2v-1z"/>
+  </g>
+  <g id="bk-restore">
+    <g id="star">
+      <path fill="url(#starGradient)" d="M34.2 9.73c.213-2.14.213-2.14-.921-3.23-1.66-1.6-1.52-2.14.636-2.41 1.76-.22 1.78-.23 2.61-1.93.488-.992 1.05-1.7 1.34-1.7.293 0 .856.717 1.35 1.72.841 1.71.854 1.72 2.61 1.94 2.15.268 2.28.789.629 2.38-1.13 1.09-1.13 1.09-.921 3.23.251 2.52.023 2.65-2.26 1.32-1.41-.823-1.41-.823-2.81 0-2.28 1.33-2.51 1.2-2.26-1.32z"/>
+      <path fill="#cd9a34" d="M38 0c-.299 0-.462.127-.608.245a2.635 2.635 0 0 0-.405.427 7.3 7.3 0 0 0-.769 1.26c-.396.805-.589 1.13-.738 1.24-.15.111-.468.179-1.3.283-.535.067-.96.148-1.32.287-.357.139-.715.384-.825.8-.11.417.055.788.274 1.12.219.328.53.662.939 1.06.539.519.706.698.767.911.06.213.04.683-.062 1.7-.06.607-.095 1.08-.07 1.47.012.198.037.381.107.566a.995.995 0 0 0 .411.502c.408.238.81.117 1.19-.035.38-.152.808-.391 1.36-.712.67-.391.938-.508 1.05-.508.114 0 .383.117 1.05.508.55.32.981.56 1.36.712.38.152.78.274 1.19.035a.995.995 0 0 0 .411-.502c.071-.185.096-.367.108-.566.025-.397-.01-.867-.07-1.47-.103-1.02-.124-1.49-.062-1.7.06-.213.228-.392.767-.911.407-.392.717-.723.935-1.05.218-.325.386-.693.276-1.11-.11-.416-.467-.657-.822-.794-.355-.137-.78-.217-1.31-.283-.833-.104-1.15-.169-1.3-.281-.15-.111-.343-.437-.743-1.25a7.138 7.138 0 0 0-.776-1.27 2.608 2.608 0 0 0-.405-.429C38.464.136 38.3.007 38 .007zm0 1.24c.042.044.073.07.126.137.192.245.428.627.648 1.07.4.814.612 1.31 1.09 1.66.473.351.997.391 1.83.495.488.06.849.14 1.04.214.194.075.154.1.135.029-.019-.071.014-.014-.122.188s-.401.5-.78.866c-.539.519-.912.86-1.07 1.41-.158.555-.077 1.1.024 2.12.06.589.083 1.03.067 1.29-.004.072-.012.088-.02.128.008-.01.047-.001-.137-.075-.264-.106-.672-.326-1.21-.64-.67-.39-1.07-.662-1.62-.662-.555 0-.954.272-1.62.663-.535.313-.945.533-1.21.639-.184.073-.145.065-.137.075-.008-.04-.016-.056-.02-.128-.017-.26.01-.704.068-1.29.102-1.02.182-1.56.025-2.12-.158-.555-.533-.896-1.07-1.41-.381-.367-.646-.67-.783-.873-.136-.204-.104-.263-.122-.197-.018.066-.054.04.14-.036.197-.076.556-.158 1.05-.219.839-.105 1.36-.146 1.84-.495.475-.349.685-.84 1.08-1.65.218-.442.453-.82.644-1.06.051-.065.082-.089.124-.133z"/>
+    </g>
+    <path fill="#169103" d="M43 6.7c-2.37 0-4.34 1.65-4.85 3.87h2.03c.458-1.13 1.54-1.94 2.82-1.94.692 0 1.23.154 1.77.541l-1.39 2.17H48v-4.65l-1.85 1.08c-.923-.698-2-1.08-3.15-1.08zm-5 4.65V16l1.85-1.08c.923.698 2 1.08 3.15 1.08 2.37 0 4.34-1.65 4.85-3.87h-2.03c-.458 1.13-1.54 1.94-2.82 1.94-.692 0-1.23-.154-1.77-.541l1.39-2.17z"/>
+  </g>
+</svg>
diff --git a/palemoon/themes/windows/places/organizer.css b/palemoon/themes/windows/places/organizer.css
index 45851d0da..0a947c2ac 100644
--- a/palemoon/themes/windows/places/organizer.css
+++ b/palemoon/themes/windows/places/organizer.css
@@ -6,19 +6,21 @@
   --toolbar-custom-color: hsl(210,75%,92%);
   --toolbar-highlight-top: rgba(255,255,255,.5);
   --toolbarbutton-image: url("chrome://browser/skin/Toolbar.png");
+  --library-toolbar-image: url("chrome://browser/skin/places/libraryToolbar.png");
 }
 
 /* Use SVG for HiDPI 133%+ */
 @media (min-resolution: 1.33dppx) {
   :root {
     --toolbarbutton-image: url("chrome://browser/skin/Toolbar.svg");
+    --library-toolbar-image: url("chrome://browser/skin/places/libraryToolbar.svg");
   }
 }
 
 /* Toolbar */
 #placesToolbar {
   padding: 3px;
-  -moz-padding-end: 6px;
+  padding-inline-end: 6px;
 }
 
 #placesToolbar > toolbarbutton[disabled] > .toolbarbutton-icon {
@@ -45,14 +47,14 @@
 
 /* Menu */
 #placesMenu {
-  -moz-margin-start: 6px;
+  margin-inline-start: 6px;
   -moz-appearance: none;
   border: none;
 }
 
 #placesMenu > menu {
-  -moz-padding-start: 4px;
-  -moz-padding-end: 1px;
+  padding-inline-start: 4px;
+  padding-inline-end: 1px;
   padding-top: 2px;
   padding-bottom: 2px;
   -moz-appearance: toolbarbutton;
@@ -73,14 +75,14 @@
 
 #placesMenu > menu[open="true"] {
   border-color: ThreeDShadow ThreeDHighlight ThreeDHighlight ThreeDShadow;
-  -moz-padding-start: 5px;
-  -moz-padding-end: 0px;
+  padding-inline-start: 5px;
+  padding-inline-end: 0px;
   padding-top: 3px;
   padding-bottom: 1px;
 }
 
 #placesMenu > menu > .menubar-text {
-  -moz-padding-end: 8px;
+  padding-inline-end: 8px;
   background: url(chrome://global/skin/arrow/arrow-dn.gif) right center no-repeat;
 }
 
@@ -92,35 +94,23 @@
 #organizeButton, 
 #viewMenu, 
 #maintenanceButton {
-  list-style-image: url("chrome://browser/skin/places/libraryToolbar.png");
+  list-style-image: var(--library-toolbar-image);
 }
 
 /* organize button */
 #organizeButton {
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
-#organizeButton:hover,
-#organizeButton[open="true"] {
-  -moz-image-region: rect(16px, 16px, 32px, 0px);
-}
 
 /* view button */
 #viewMenu {
   -moz-image-region: rect(0px, 32px, 16px, 16px);
 }
-#viewMenu:hover,
-#viewMenu[open="true"] {
-  -moz-image-region: rect(16px, 32px, 32px, 16px);
-}
 
 /* maintenance button */
 #maintenanceButton {
   -moz-image-region: rect(0px, 48px, 16px, 32px);
 }
-#maintenanceButton:hover,
-#maintenanceButton[open="true"] {
-  -moz-image-region: rect(16px, 48px, 32px, 32px);
-}
 
 /* Root View */
 #placesView {
@@ -134,12 +124,12 @@
 }
 
 #infoBoxExpanderLabel {
-  -moz-padding-start: 2px;
+  padding-inline-start: 2px;
 }
 
 #organizerScopeBar {
   padding: 2px 0;
-  -moz-padding-end: 3px;
+  padding-inline-end: 3px;
 }
 
 #organizerScopeBar > toolbarbutton {
@@ -181,8 +171,8 @@
 }
 
 #clearDownloadsButton {
-  -moz-padding-start: 9px;
-  -moz-padding-end: 9px;
+  padding-inline-start: 9px;
+  padding-inline-end: 9px;
 }
 
 #placesView {
@@ -205,11 +195,11 @@
 @media (-moz-windows-default-theme) {
   #placesView > splitter {
     border: 0;
-    -moz-border-end: 1px solid #A9B7C9;
+    border-inline-end: 1px solid #A9B7C9;
     min-width: 0;
     width: 3px;
     background-color: transparent;
-    -moz-margin-start: -3px;
+    margin-inline-start: -3px;
     position: relative;
   }
 }
@@ -245,7 +235,7 @@
   #searchFilter {
     -moz-appearance: none;
     padding: 2px;
-    -moz-padding-start: 4px;
+    padding-inline-start: 4px;
     background-clip: padding-box;
     border: 1px solid rgba(0,0,0,.32);
     border-radius: 2px;
diff --git a/palemoon/themes/windows/places/places.css b/palemoon/themes/windows/places/places.css
index bb160463e..a16b82113 100644
--- a/palemoon/themes/windows/places/places.css
+++ b/palemoon/themes/windows/places/places.css
@@ -168,5 +168,5 @@ treechildren::-moz-tree-cell-text(cutting) {
 #viewButton > .button-box > .button-menu-dropmarker {
   height: auto;
   width: auto;
-  -moz-margin-end: -3px;
+  margin-inline-end: -3px;
 }
diff --git a/palemoon/themes/windows/preferences/applications.css b/palemoon/themes/windows/preferences/applications.css
index 80699b463..fdf561477 100644
--- a/palemoon/themes/windows/preferences/applications.css
+++ b/palemoon/themes/windows/preferences/applications.css
@@ -11,18 +11,18 @@
 .actionsMenu {
   margin-top: 0;
   margin-bottom: 0;
-  -moz-margin-start: -2px;
-  -moz-margin-end: 0;
+  margin-inline-start: -2px;
+  margin-inline-end: 0;
 }
 
 .typeIcon,
 .actionIcon {
-  -moz-margin-start: 3px;
-  -moz-margin-end: 3px;
+  margin-inline-start: 3px;
+  margin-inline-end: 3px;
 }
 
 richlistitem label {
-  -moz-margin-start: 1px;
+  margin-inline-start: 1px;
   margin-top: 2px;
 }
 
@@ -51,14 +51,14 @@ menuitem[appHandlerIcon="plugin"] {
 }
 
 .actionsMenu .menulist-icon {
-  -moz-margin-end: 3px;
+  margin-inline-end: 3px;
 }
 
 .actionsMenu > menupopup > menuitem > .menu-iconic-left {
-  -moz-padding-start: 0px;
-  -moz-padding-end: 2px;
+  padding-inline-start: 0px;
+  padding-inline-end: 2px;
 }
 
 .actionsMenu > menupopup > menuitem {
-  -moz-padding-start: 4px;
+  padding-inline-start: 4px;
 }
diff --git a/palemoon/themes/windows/sanitizeDialog.css b/palemoon/themes/windows/sanitizeDialog.css
index 4312eb8fb..58e1f2983 100644
--- a/palemoon/themes/windows/sanitizeDialog.css
+++ b/palemoon/themes/windows/sanitizeDialog.css
@@ -3,12 +3,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #sanitizeDurationChoice {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 
 /* Align the duration label with the warning box and item list */
 #sanitizeDurationLabel {
-  -moz-margin-start: 3px;
+  margin-inline-start: 3px;
 }
 
 
@@ -79,15 +79,15 @@
 
 /* Make the item list the same width as the warning box */
 #itemList {
-  -moz-margin-start: 0;
-  -moz-margin-end: 0;
+  margin-inline-start: 0;
+  margin-inline-end: 0;
 }
 
 
 /* Align the last dialog button with the end of the warning box */
 .prefWindow-dlgbuttons {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
 .dialog-button[dlgtype="cancel"] {
-  -moz-margin-end: 0;
+  margin-inline-end: 0;
 }
diff --git a/palemoon/themes/windows/searchbar.css b/palemoon/themes/windows/searchbar.css
index 86a485530..d660772b9 100644
--- a/palemoon/themes/windows/searchbar.css
+++ b/palemoon/themes/windows/searchbar.css
@@ -22,7 +22,7 @@
   width: 16px;
   list-style-image: url("chrome://global/skin/icons/folder-item.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px);
-  -moz-margin-start: 2px;
+  margin-inline-start: 2px;
 }
 
 .searchbar-engine-button {
@@ -30,7 +30,7 @@
   min-width: 0;
   margin: 0;
   padding: 0;
-  -moz-padding-end: 2px;
+  padding-inline-end: 2px;
   -moz-box-align: center;
   background: none;
   border: none;
diff --git a/palemoon/themes/windows/statusbar/overlay.css b/palemoon/themes/windows/statusbar/overlay.css
index 7f9a5982f..d9a36789b 100644
--- a/palemoon/themes/windows/statusbar/overlay.css
+++ b/palemoon/themes/windows/statusbar/overlay.css
@@ -58,7 +58,7 @@ toolbar[brighttext] #status4evar-download-button #status4evar-download-icon
 
 toolbar[mode="icons"] #status4evar-download-button[forcelabel="true"] > label
 {
-	-moz-margin-start: 5px !important;
+	margin-inline-start: 5px !important;
 }
 
 /*
@@ -77,7 +77,7 @@ splitter.status4evar-status-splitter
 
 #urlbar-progress-alt
 {
-	-moz-margin-end: -2px;
+	margin-inline-end: -2px;
 }
 
 /*
diff --git a/palemoon/themes/windows/syncCommon.css b/palemoon/themes/windows/syncCommon.css
index f0beae0d5..838788cd5 100644
--- a/palemoon/themes/windows/syncCommon.css
+++ b/palemoon/themes/windows/syncCommon.css
@@ -8,7 +8,7 @@
 }
 
 .statusIcon {
-  -moz-margin-start: 4px;
+  margin-inline-start: 4px;
   max-height: 16px;
   max-width: 16px;
 }
diff --git a/palemoon/themes/windows/syncSetup.css b/palemoon/themes/windows/syncSetup.css
index fff65e963..8898951eb 100644
--- a/palemoon/themes/windows/syncSetup.css
+++ b/palemoon/themes/windows/syncSetup.css
@@ -99,7 +99,7 @@ description > .text-link:focus {
 }
 
 .inputColumn {
-  -moz-margin-end: 2px
+  margin-inline-end: 2px
 }
 
 .pin {
diff --git a/platform b/platform
-Subproject a1e6132772816ebf5cced2e02b23bcf637fea40
+Subproject 963fc807963bf0bf83d5fefa945acbafa2dfc9f