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diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_sources-large.js b/devtools/client/debugger/test/mochitest/browser_dbg_sources-large.js
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index 0000000000..31b64c2fdc
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+++ b/devtools/client/debugger/test/mochitest/browser_dbg_sources-large.js
@@ -0,0 +1,80 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests that large files are treated differently in the debugger:
+ *   1) No parsing to determine current symbol is attempted when
+ *      starting a search
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_function-search.html";
+
+function test() {
+  let options = {
+    source: EXAMPLE_URL + "code_function-search-01.js",
+    line: 1
+  };
+  initDebugger(TAB_URL, options).then(([aTab, aDebuggee, aPanel]) => {
+    const gTab = aTab;
+    const gDebuggee = aDebuggee;
+    const gPanel = aPanel;
+    const gDebugger = gPanel.panelWin;
+
+    const gEditor = gDebugger.DebuggerView.editor;
+    const gSources = gDebugger.DebuggerView.Sources;
+    const Filtering = gDebugger.DebuggerView.Filtering;
+
+    // Setting max size so that code_function-search-01.js will be
+    // considered a large file on first load
+    gDebugger.DebuggerView.LARGE_FILE_SIZE = 1;
+
+    function testLargeFile() {
+      ok(gEditor.getText().length > gDebugger.DebuggerView.LARGE_FILE_SIZE,
+         "First source is considered a large file.");
+      is(gEditor.getMode().name, "javascript",
+         "Editor is syntax highlighting.");
+      ok(gEditor.getText().includes("First source!"),
+         "Editor text contents appears to be correct.");
+
+      // Press ctrl+f with the cursor in a token
+      gEditor.focus();
+      gEditor.setCursor({ line: 3, ch: 10});
+      synthesizeKeyFromKeyTag(gDebugger.document.getElementById("tokenSearchKey"));
+      is(Filtering._searchbox.value, "#",
+        "Search box is NOT prefilled with current token");
+    }
+
+    function testSmallFile() {
+      ok(gEditor.getText().length < gDebugger.DebuggerView.LARGE_FILE_SIZE,
+         "Second source is considered a small file.");
+      is(gEditor.getMode().name, "javascript",
+         "Editor is syntax highlighting.");
+      ok(gEditor.getText().includes("First source!"),
+         "Editor text contents appears to be correct.");
+
+      // Press ctrl+f with the cursor in a token
+      gEditor.focus();
+      gEditor.setCursor({ line: 3, ch: 10});
+      synthesizeKeyFromKeyTag(gDebugger.document.getElementById("tokenSearchKey"));
+      is(Filtering._searchbox.value, "#test",
+        "Search box is prefilled with current token");
+    }
+
+    Task.spawn(function* () {
+      yield testLargeFile();
+
+      info("Making it appear as a small file and then reselecting 01.js");
+      gDebugger.DebuggerView.LARGE_FILE_SIZE = 1000;
+      gSources.selectedIndex = 1;
+      yield waitForSourceShown(gPanel, "-02.js");
+      gSources.selectedIndex = 0;
+      yield waitForSourceShown(gPanel, "-01.js");
+
+      yield testSmallFile();
+
+      closeDebuggerAndFinish(gPanel);
+    });
+  });
+}