Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

25 files changed, 502 insertions, 88 deletions

diff --git a/widget/tests/browser/browser_test_clipboard_contextmenu.js b/widget/tests/browser/browser_test_clipboard_contextmenu.js
index 4d268d5be4..80e8c33282 100644
--- a/widget/tests/browser/browser_test_clipboard_contextmenu.js
+++ b/widget/tests/browser/browser_test_clipboard_contextmenu.js
@@ -63,7 +63,7 @@ async function clipboardAsyncGetData(aBrowser, aClipboardType) {
             "nsIAsyncClipboardGetCallback",
           ]),
           // nsIAsyncClipboardGetCallback
-          onSuccess: aAsyncGetClipboardData => {
+          onSuccess: () => {
             resolve();
           },
           onError: aResult => {
diff --git a/widget/tests/browser/browser_test_clipboardcache.js b/widget/tests/browser/browser_test_clipboardcache.js
index 8cb6adb8b5..64deb99608 100644
--- a/widget/tests/browser/browser_test_clipboardcache.js
+++ b/widget/tests/browser/browser_test_clipboardcache.js
@@ -103,6 +103,10 @@ async function testCopyPaste(isPrivate) {
     document.execCommand("paste");
     return pastePromise;
   });
+
+  // Don't use Assert.strictEqual here because the test starts timing out,
+  // because the logging creates lots of copies of this very huge string.
+  // eslint-disable-next-line mozilla/no-comparison-or-assignment-inside-ok
   ok(readStr === Ipsum, "Read what we pasted");
 
   if (isPrivate) {
diff --git a/widget/tests/browser/browser_test_swipe_gesture.js b/widget/tests/browser/browser_test_swipe_gesture.js
index 0ac85d80c8..0f45672206 100644
--- a/widget/tests/browser/browser_test_swipe_gesture.js
+++ b/widget/tests/browser/browser_test_swipe_gesture.js
@@ -123,9 +123,9 @@ add_task(async () => {
   computedOpacity = window
     .getComputedStyle(gHistorySwipeAnimation._prevBox)
     .getPropertyValue("opacity");
-  ok(computedOpacity == 1, "computed opacity of prevbox is 1");
+  Assert.equal(computedOpacity, 1, "computed opacity of prevbox is 1");
   opacity = gHistorySwipeAnimation._prevBox.style.opacity;
-  ok(opacity == 0, "element.style opacity of prevbox 0");
+  Assert.equal(opacity, 0, "element.style opacity of prevbox 0");
 
   if (isTranslatingIcon) {
     // We don't have a transition for translate property so that we still have
@@ -232,9 +232,9 @@ add_task(async () => {
   computedOpacity = window
     .getComputedStyle(gHistorySwipeAnimation._prevBox)
     .getPropertyValue("opacity");
-  ok(computedOpacity == 1, "computed opacity of prevbox is 1");
+  Assert.equal(computedOpacity, 1, "computed opacity of prevbox is 1");
   opacity = gHistorySwipeAnimation._prevBox.style.opacity;
-  ok(opacity == 0, "element.style opacity of prevbox 0");
+  Assert.equal(opacity, 0, "element.style opacity of prevbox 0");
 
   // Make sure the gesture triggered going back to the previous page.
   await Promise.all([startLoadingPromise, stoppedLoadingPromise]);
@@ -317,9 +317,9 @@ add_task(async () => {
     let computedOpacity = window
       .getComputedStyle(gHistorySwipeAnimation._prevBox)
       .getPropertyValue("opacity");
-    ok(computedOpacity == 1, "computed opacity of prevbox is 1");
+    Assert.equal(computedOpacity, 1, "computed opacity of prevbox is 1");
     let opacity = gHistorySwipeAnimation._prevBox.style.opacity;
-    ok(opacity == 0, "element.style opacity of prevbox 0");
+    Assert.equal(opacity, 0, "element.style opacity of prevbox 0");
 
     // Make sure the gesture triggered going back to the previous page.
     await Promise.all([startLoadingPromise, stoppedLoadingPromise]);
@@ -343,7 +343,7 @@ add_task(async () => {
     }
     numTries--;
   }
-  ok(numTries > 0, "never ran the test");
+  Assert.greater(numTries, 0, "never ran the test");
   await SpecialPowers.popPrefEnv();
 });
 
@@ -576,7 +576,7 @@ add_task(async () => {
 
   await panLeftToRightBegin(tab.linkedBrowser, 100, 100, 100);
 
-  ok(gHistorySwipeAnimation._prevBox != null, "should have prevbox");
+  Assert.notEqual(gHistorySwipeAnimation._prevBox, null, "should have prevbox");
   let transitionCancelPromise = new Promise(resolve => {
     gHistorySwipeAnimation._prevBox.addEventListener(
       "transitioncancel",
@@ -635,7 +635,7 @@ add_task(async () => {
 
   await panRightToLeftBegin(tab.linkedBrowser, 100, 100, 100);
 
-  ok(gHistorySwipeAnimation._nextBox != null, "should have nextbox");
+  Assert.notEqual(gHistorySwipeAnimation._nextBox, null, "should have nextbox");
   transitionCancelPromise = new Promise(resolve => {
     gHistorySwipeAnimation._nextBox.addEventListener(
       "transitioncancel",
@@ -1131,7 +1131,7 @@ add_task(async () => {
 
   // Set up an APZ aware event listener and...
   await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
-    content.document.documentElement.addEventListener("wheel", e => {}, {
+    content.document.documentElement.addEventListener("wheel", () => {}, {
       passive: false,
     });
     await content.wrappedJSObject.promiseApzFlushedRepaints();
diff --git a/widget/tests/chrome.toml b/widget/tests/chrome.toml
index 08d02d3c36..8706a67185 100644
--- a/widget/tests/chrome.toml
+++ b/widget/tests/chrome.toml
@@ -9,9 +9,6 @@ support-files = [
 
 # Privacy relevant
 
-["test_bug1123480.xhtml"]
-skip-if = ["win11_2009 && bits == 32"]
-
 ["test_bug343416.xhtml"]
 skip-if = ["debug"]
 
@@ -66,8 +63,8 @@ run-if = ["os == 'mac'"] # Cocoa widget test
 
 ["test_bug760802.xhtml"]
 
-["test_clipboard_chrome.html"]
-support-files = "file_test_clipboard.js"
+["test_bug1123480.xhtml"]
+skip-if = ["win11_2009 && bits == 32"]
 
 ["test_clipboard_asyncGetData_chrome.html"]
 support-files = "file_test_clipboard_asyncGetData.js"
@@ -77,11 +74,20 @@ support-files = "file_test_clipboard_asyncSetData.js"
 
 ["test_clipboard_cache_chrome.html"]
 
+["test_clipboard_chrome.html"]
+support-files = "file_test_clipboard.js"
+
+["test_clipboard_getDataSnapshotSync_chrome.html"]
+support-files = "file_test_clipboard_getDataSnapshotSync.js"
+
 ["test_clipboard_owner_chrome.html"]
 
 ["test_composition_text_querycontent.xhtml"]
 support-files = ["window_composition_text_querycontent.xhtml"]
 
+["test_ime_focus_with_multiple_contenteditable.html"]
+support-files = ["file_ime_state_test_helper.js"]
+
 ["test_ime_state_in_contenteditable_on_readonly_change_in_parent.html"]
 support-files = [
   "file_ime_state_test_helper.js",
diff --git a/widget/tests/clipboard_helper.js b/widget/tests/clipboard_helper.js
index 96787468fb..76ed2aeb37 100644
--- a/widget/tests/clipboard_helper.js
+++ b/widget/tests/clipboard_helper.js
@@ -157,11 +157,21 @@ function getClipboardData(aFlavor, aClipboardType) {
   }
 }
 
-function asyncGetClipboardData(aClipboardType) {
+function getClipboardDataSnapshotSync(aClipboardType) {
+  return clipboard.getDataSnapshotSync(
+    ["text/plain", "text/html", "image/png"],
+    aClipboardType
+  );
+}
+
+function asyncGetClipboardData(
+  aClipboardType,
+  aFormats = ["text/plain", "text/html", "image/png"]
+) {
   return new Promise((resolve, reject) => {
     try {
       clipboard.asyncGetData(
-        ["text/plain", "text/html", "image/png"],
+        aFormats,
         aClipboardType,
         null,
         SpecialPowers.Services.scriptSecurityManager.getSystemPrincipal(),
diff --git a/widget/tests/file_test_clipboard_asyncGetData.js b/widget/tests/file_test_clipboard_asyncGetData.js
index e7f2e5f0f1..3ff5700e1a 100644
--- a/widget/tests/file_test_clipboard_asyncGetData.js
+++ b/widget/tests/file_test_clipboard_asyncGetData.js
@@ -94,7 +94,7 @@ clipboardTypes.forEach(function (type) {
       () => {
         ok(false, "asyncClipboardRequestGetData should not success");
       },
-      e => {
+      () => {
         ok(true, "asyncClipboardRequestGetData should reject");
       }
     );
@@ -133,7 +133,7 @@ clipboardTypes.forEach(function (type) {
       () => {
         ok(false, "asyncClipboardRequestGetData should not success");
       },
-      e => {
+      () => {
         ok(true, "asyncClipboardRequestGetData should reject");
       }
     );
diff --git a/widget/tests/file_test_clipboard_getDataSnapshotSync.js b/widget/tests/file_test_clipboard_getDataSnapshotSync.js
new file mode 100644
index 0000000000..92d7475e9c
--- /dev/null
+++ b/widget/tests/file_test_clipboard_getDataSnapshotSync.js
@@ -0,0 +1,153 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* import-globals-from clipboard_helper.js */
+
+"use strict";
+
+clipboardTypes.forEach(function (type) {
+  if (!clipboard.isClipboardTypeSupported(type)) {
+    add_task(async function test_clipboard_requestGetData_not_support() {
+      info(`Test getDataSnapshotSync request throwing on ${type}`);
+      SimpleTest.doesThrow(
+        () => clipboard.getDataSnapshotSync(["text/plain"], type),
+        "Passing unsupported clipboard type should throw"
+      );
+    });
+    return;
+  }
+
+  add_task(async function test_clipboard_getDataSnapshotSync_throw() {
+    info(`Test getDataSnapshotSync request throwing on ${type}`);
+    SimpleTest.doesThrow(
+      () => clipboard.getDataSnapshotSync([], type),
+      "Passing empty flavor list should throw"
+    );
+  });
+
+  add_task(
+    async function test_clipboard_getDataSnapshotSync_no_matched_flavor() {
+      info(`Test getDataSnapshotSync have no matched flavor on ${type}`);
+      cleanupAllClipboard();
+      is(
+        getClipboardData("text/plain", type),
+        null,
+        "ensure clipboard is empty"
+      );
+
+      writeRandomStringToClipboard("text/plain", type);
+      let request = clipboard.getDataSnapshotSync(["text/html"], type);
+      isDeeply(request.flavorList, [], "Check flavorList");
+    }
+  );
+
+  add_task(async function test_empty_data() {
+    info(`Test getDataSnapshotSync request with empty data on ${type}`);
+    cleanupAllClipboard();
+    is(getClipboardData("text/plain", type), null, "ensure clipboard is empty");
+
+    let request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, [], "Check flavorList");
+    await asyncClipboardRequestGetData(request, "text/plain", true).catch(
+      () => {}
+    );
+  });
+
+  add_task(async function test_clipboard_getDataSnapshotSync_after_write() {
+    info(`Test getDataSnapshotSync request after write on ${type}`);
+
+    let str = writeRandomStringToClipboard("text/plain", type);
+    let request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, ["text/plain"], "Check flavorList");
+    is(
+      await asyncClipboardRequestGetData(request, "text/plain"),
+      str,
+      "Check data"
+    );
+    ok(request.valid, "request should still be valid");
+    // Requesting a flavor that is not in the list should throw error.
+    await asyncClipboardRequestGetData(request, "text/html", true).catch(
+      () => {}
+    );
+    ok(request.valid, "request should still be valid");
+
+    // Writing a new data should invalid existing get request.
+    str = writeRandomStringToClipboard("text/plain", type);
+    await asyncClipboardRequestGetData(request, "text/plain").then(
+      () => {
+        ok(false, "asyncClipboardRequestGetData should not success");
+      },
+      () => {
+        ok(true, "asyncClipboardRequestGetData should reject");
+      }
+    );
+    ok(!request.valid, "request should no longer be valid");
+
+    info(`check clipboard data again`);
+    request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, ["text/plain"], "Check flavorList");
+    is(
+      await asyncClipboardRequestGetData(request, "text/plain"),
+      str,
+      "Check data"
+    );
+
+    cleanupAllClipboard();
+  });
+
+  add_task(async function test_clipboard_getDataSnapshotSync_after_empty() {
+    info(`Test getDataSnapshotSync request after empty on ${type}`);
+
+    let str = writeRandomStringToClipboard("text/plain", type);
+    let request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, ["text/plain"], "Check flavorList");
+    is(
+      await asyncClipboardRequestGetData(request, "text/plain"),
+      str,
+      "Check data"
+    );
+    ok(request.valid, "request should still be valid");
+
+    // Empty clipboard data
+    emptyClipboardData(type);
+    is(getClipboardData("text/plain", type), null, "ensure clipboard is empty");
+
+    await asyncClipboardRequestGetData(request, "text/plain").then(
+      () => {
+        ok(false, "asyncClipboardRequestGetData should not success");
+      },
+      () => {
+        ok(true, "asyncClipboardRequestGetData should reject");
+      }
+    );
+    ok(!request.valid, "request should no longer be valid");
+
+    info(`check clipboard data again`);
+    request = getClipboardDataSnapshotSync(type);
+    isDeeply(request.flavorList, [], "Check flavorList");
+
+    cleanupAllClipboard();
+  });
+});
+
+add_task(async function test_clipboard_getDataSnapshotSync_html_data() {
+  info(`Test getDataSnapshotSync request with html data`);
+
+  const html_str = `<img src="https://example.com/oops">`;
+  writeStringToClipboard(html_str, "text/html", clipboard.kGlobalClipboard);
+
+  let request = getClipboardDataSnapshotSync(clipboard.kGlobalClipboard);
+  isDeeply(request.flavorList, ["text/html"], "Check flavorList");
+  is(
+    await asyncClipboardRequestGetData(request, "text/html"),
+    // On Windows, widget adds extra data into HTML clipboard.
+    navigator.platform.includes("Win")
+      ? `<html><body>\n<!--StartFragment-->${html_str}<!--EndFragment-->\n</body>\n</html>`
+      : html_str,
+    "Check data"
+  );
+  // Requesting a flavor that is not in the list should throw error.
+  await asyncClipboardRequestGetData(request, "text/plain", true).catch(
+    () => {}
+  );
+});
diff --git a/widget/tests/mochitest.toml b/widget/tests/mochitest.toml
index 32dcf5c795..4a4a9d2729 100644
--- a/widget/tests/mochitest.toml
+++ b/widget/tests/mochitest.toml
@@ -25,12 +25,16 @@ skip-if = [
 support-files = ["file_test_clipboard.js"]
 
 ["test_clipboard_asyncGetData.html"]
-skip-if = ["display == 'wayland'"] # Bug 1864211
+skip-if = ["display == 'wayland'"] # Bug 1879835
 support-files = ["file_test_clipboard_asyncGetData.js"]
 
 ["test_clipboard_asyncSetData.html"]
 support-files = ["file_test_clipboard_asyncSetData.js"]
 
+["test_clipboard_getDataSnapshotSync.html"]
+skip-if = ["display == 'wayland'"] # Bug 1879835
+support-files = "file_test_clipboard_getDataSnapshotSync.js"
+
 ["test_contextmenu_by_mouse_on_unix.html"]
 run-if = ["os == 'linux'"]
 skip-if = ["headless"] # headless widget doesn't dispatch contextmenu event by mouse event.
diff --git a/widget/tests/standalone_native_menu_window.xhtml b/widget/tests/standalone_native_menu_window.xhtml
index 4155126ad5..36c65b0e2c 100644
--- a/widget/tests/standalone_native_menu_window.xhtml
+++ b/widget/tests/standalone_native_menu_window.xhtml
@@ -141,13 +141,13 @@
       let popupShowingFired = false;
       let itemActivated = false;
 
-      menupopup.addEventListener("popupshowing", function (e) {
+      menupopup.addEventListener("popupshowing", function () {
         popupShowingFired = true;
 
         let menuitem = document.createElementNS(XUL_NS, "menuitem");
         menuitem.setAttribute("label", "detached menu item");
         /* eslint-disable-next-line no-shadow */
-        menuitem.addEventListener("command", function (e) {
+        menuitem.addEventListener("command", function () {
           itemActivated = true;
         })
         menupopup.appendChild(menuitem);
diff --git a/widget/tests/test_bug343416.xhtml b/widget/tests/test_bug343416.xhtml
index bf4dbbb9b4..32e717d6e5 100644
--- a/widget/tests/test_bug343416.xhtml
+++ b/widget/tests/test_bug343416.xhtml
@@ -30,7 +30,7 @@ SimpleTest.waitForExplicitFinish();
 var idleObserver =
 {
     QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
-    observe: function _observe(subject, topic, data)
+    observe: function _observe(subject, topic)
     {
         if (topic != "idle")
             return;
diff --git a/widget/tests/test_clipboard_cache_chrome.html b/widget/tests/test_clipboard_cache_chrome.html
index 55b6d41589..81d7a652b6 100644
--- a/widget/tests/test_clipboard_cache_chrome.html
+++ b/widget/tests/test_clipboard_cache_chrome.html
@@ -37,7 +37,12 @@ function testClipboardCache(aClipboardType, aAsync, aIsSupportGetFromCachedTrans
     addStringToTransferable("text/foo", string, trans);
     // XXX macOS caches the transferable to implement kSelectionCache type, too,
     // so it behaves differently than other types.
-    if (aClipboardType == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+    if (
+      navigator.platform.includes("Mac") &&
+      aClipboardType == clipboard.kSelectionCache &&
+      !aIsSupportGetFromCachedTransferable &&
+      !SpecialPowers.isHeadless
+    ) {
       todo_is(getClipboardData("text/foo", aClipboardType),
               aIsSupportGetFromCachedTransferable ? string : null,
               `Check text/foo data on clipboard ${aClipboardType}`);
@@ -66,7 +71,12 @@ function testClipboardCache(aClipboardType, aAsync, aIsSupportGetFromCachedTrans
        `Check text/plain data on clipboard ${aClipboardType} again`);
     // XXX macOS caches the transferable to implement kSelectionCache type, too,
     // so it behaves differently than other types.
-    if (aClipboardType == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+    if (
+      navigator.platform.includes("Mac") &&
+      aClipboardType == clipboard.kSelectionCache &&
+      !aIsSupportGetFromCachedTransferable &&
+      !SpecialPowers.isHeadless
+    ) {
       todo_is(getClipboardData("text/foo", aClipboardType),
               aIsSupportGetFromCachedTransferable ? string : null,
               `Check text/foo data on clipboard ${aClipboardType} again`);
@@ -118,7 +128,12 @@ function runClipboardCacheTests(aIsSupportGetFromCachedTransferable) {
          `Check if there is text/plain flavor on clipboard ${type}`);
       // XXX macOS caches the transferable to implement kSelectionCache type, too,
       // so it behaves differently than other types.
-      if (type == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+      if (
+        navigator.platform.includes("Mac") &&
+        type == clipboard.kSelectionCache &&
+        !aIsSupportGetFromCachedTransferable &&
+        !SpecialPowers.isHeadless
+      ) {
         todo_is(clipboard.hasDataMatchingFlavors(["text/foo"], type),
                 aIsSupportGetFromCachedTransferable,
                 `Check if there is text/foo flavor on clipboard ${type}`);
@@ -147,7 +162,12 @@ function runClipboardCacheTests(aIsSupportGetFromCachedTransferable) {
          `Check if there is text/plain flavor on clipboard ${type}`);
       // XXX macOS caches the transferable to implement kSelectionCache type, too,
       // so it behaves differently than other types.
-      if (type == clipboard.kSelectionCache && !aIsSupportGetFromCachedTransferable) {
+      if (
+        navigator.platform.includes("Mac") &&
+        type == clipboard.kSelectionCache &&
+        !aIsSupportGetFromCachedTransferable &&
+        !SpecialPowers.isHeadless
+      ) {
         todo_is(clipboard.hasDataMatchingFlavors(["text/foo"], type),
                 aIsSupportGetFromCachedTransferable,
                 `Check if there is text/foo flavor on clipboard ${type}`);
@@ -212,6 +232,33 @@ function runClipboardCacheTests(aIsSupportGetFromCachedTransferable) {
       await testClipboardData(await asyncGetClipboardData(type), clipboardData);
     });
 
+    add_task(async function test_flavorList_order() {
+      info(`test_flavorList_order with pref ` +
+           `${aIsSupportGetFromCachedTransferable ? "enabled" : "disabled"}`);
+
+      const trans = generateNewTransferable("text/plain", generateRandomString());
+      addStringToTransferable("text/html", `<div>${generateRandomString()}</div>`, trans);
+
+      info(`Writedata to clipboard ${type}`);
+      clipboard.setData(trans, null, type);
+
+      // Read with reverse order.
+      let flavors = trans.flavorsTransferableCanExport().reverse();
+      let request = await asyncGetClipboardData(type, flavors);
+      // XXX Not all clipboard type supports html format, e.g. kFindClipboard
+      // on macOS only support writing text/plain.
+      if (
+        navigator.platform.includes("Mac") &&
+        type == clipboard.kFindClipboard &&
+        !aIsSupportGetFromCachedTransferable &&
+        !SpecialPowers.isHeadless
+      ) {
+        isDeeply(request.flavorList, ["text/plain"], "check flavor orders");
+      } else {
+        isDeeply(request.flavorList, flavors, "check flavor orders");
+      }
+    });
+
     // Test sync set clipboard data.
     testClipboardCache(type, false, aIsSupportGetFromCachedTransferable);
 
diff --git a/widget/tests/test_clipboard_getDataSnapshotSync.html b/widget/tests/test_clipboard_getDataSnapshotSync.html
new file mode 100644
index 0000000000..e800f6a1b0
--- /dev/null
+++ b/widget/tests/test_clipboard_getDataSnapshotSync.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1858627
+-->
+<head>
+<title>Test for Bug 1858627</title>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="clipboard_helper.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<!-- Tests are in file_test_clipboard_getDataSnapshotSync.js -->
+<script src="file_test_clipboard_getDataSnapshotSync.js"></script>
+</body>
+</html>
diff --git a/widget/tests/test_clipboard_getDataSnapshotSync_chrome.html b/widget/tests/test_clipboard_getDataSnapshotSync_chrome.html
new file mode 100644
index 0000000000..fbc283ccb3
--- /dev/null
+++ b/widget/tests/test_clipboard_getDataSnapshotSync_chrome.html
@@ -0,0 +1,19 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1858627
+-->
+<head>
+<title>Test for Bug 1858627</title>
+<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<script src="clipboard_helper.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<!-- Tests are in file_test_clipboard_getDataSnapshotSync.js -->
+<script src="file_test_clipboard_getDataSnapshotSync.js"></script>
+</body>
+</html>
diff --git a/widget/tests/test_clipboard_owner_chrome.html b/widget/tests/test_clipboard_owner_chrome.html
index 4759b2b14c..2991646616 100644
--- a/widget/tests/test_clipboard_owner_chrome.html
+++ b/widget/tests/test_clipboard_owner_chrome.html
@@ -20,7 +20,7 @@ function testClipboardOwner(aClipboardType, aAsync) {
   const clipboardOwner = {
     QueryInterface: ChromeUtils.generateQI(["nsIClipboardOwner"]),
     // nsIClipboardOwner
-    LosingOwnership(aTransferable) {
+    LosingOwnership() {
       losingOwnership = true;
     },
   };
diff --git a/widget/tests/test_contextmenu_by_mouse_on_unix.html b/widget/tests/test_contextmenu_by_mouse_on_unix.html
index 2b1f643dfc..04bca8116c 100644
--- a/widget/tests/test_contextmenu_by_mouse_on_unix.html
+++ b/widget/tests/test_contextmenu_by_mouse_on_unix.html
@@ -60,7 +60,7 @@ async function process_contextmenu_event({ isMousedown, preventEvent }) {
         is(count++, 1, "The second event is contextmenu");
         e.preventDefault();
       }, { once: true });
-      target.addEventListener("mouseup", e => {
+      target.addEventListener("mouseup", () => {
         is(count++, 2, "The third event is mouseup");
 	resolve();
       }, { once: true} );
diff --git a/widget/tests/test_ime_focus_with_multiple_contenteditable.html b/widget/tests/test_ime_focus_with_multiple_contenteditable.html
new file mode 100644
index 0000000000..6b435a1a2e
--- /dev/null
+++ b/widget/tests/test_ime_focus_with_multiple_contenteditable.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1872863
+-->
+<head>
+<title>Test IME state and focus with multiple contenteditable elements</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+  <script src="file_ime_state_test_helper.js"></script>
+<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+
+<style>
+#div0 {
+  width: 200px;
+  height: 50px;
+}
+
+#div3 {
+  background-color: blue;
+  width: 200px;
+  height: 100px;
+}
+
+#div4 {
+  width: 200px;
+  height: 50px;
+}
+</style>
+<script>
+add_task(async function test_modify_contenteditable_on_focused_element() {
+  await SimpleTest.promiseFocus();
+
+  const tipWrapper = new TIPWrapper(window);
+  ok(tipWrapper.isAvailable(), "TextInputProcessor should've been initialized");
+
+  const div1 = document.getElementById("div1");
+  const div2 = document.getElementById("div2");
+  const div3 = document.getElementById("div3");
+
+  div1.addEventListener("mousedown", () => {
+    div2.contentEditable = true;
+  });
+  div3.addEventListener("mousedown", e => {
+    div2.contentEditable = false;
+    e.preventDefault();
+  });
+
+  // Set focus by mouse then contenteditable becomes true by script.
+
+  const promiseFocus = new Promise(resolve => {
+    div2.addEventListener("focus", resolve, { once: true });
+  });
+  synthesizeMouseAtCenter(div1, {});
+  await promiseFocus;
+
+  is(
+    SpecialPowers.DOMWindowUtils.IMEStatus,
+    SpecialPowers.DOMWindowUtils.IME_STATUS_ENABLED,
+    "IMEStatus is enabled on contenteditable=true"
+  );
+  ok(tipWrapper.IMEHasFocus, "IME has focus");
+
+  // Move focus by mouse then contenteditable becomes false by script.
+
+  const promiseMouseUp = new Promise(resolve => {
+    div3.addEventListener("mouseup", resolve, { once: true });
+  });
+  synthesizeMouseAtCenter(div3, {});
+  await promiseMouseUp;
+
+  is(
+    SpecialPowers.DOMWindowUtils.IMEStatus,
+    SpecialPowers.DOMWindowUtils.IME_STATUS_DISABLED,
+    "IMEStatus is disabled on contenteditable=false"
+  );
+  ok(!tipWrapper.IMEHasFocus, "IME losts focus after contenteditable=false");
+
+  // contenteditable changes to true on focused element.
+
+  const promiseMouseUp2 = new Promise(resolve => {
+    div1.addEventListener("mouseup", resolve, { once: true });
+  });
+  synthesizeMouseAtCenter(div1, {});
+  await promiseMouseUp2;
+
+  is(
+    SpecialPowers.DOMWindowUtils.IMEStatus,
+    SpecialPowers.DOMWindowUtils.IME_STATUS_ENABLED,
+    "IMEStatus is enabled on contenteditable=true"
+  );
+
+  ok(tipWrapper.IMEHasFocus, "IME has focus after contenteditable=true again");
+});
+</script>
+</head>
+<body>
+<div id="div0"><div id="div1">
+<div id="div2" contenteditable="false"><div>foo</div></div>
+</div></div>
+<div id="div3"></div>
+<div id="div4" contenteditable></div>
+</body>
+</html>
diff --git a/widget/tests/test_ime_state_others_in_parent.html b/widget/tests/test_ime_state_others_in_parent.html
index e6ae0ab272..e71ef90556 100644
--- a/widget/tests/test_ime_state_others_in_parent.html
+++ b/widget/tests/test_ime_state_others_in_parent.html
@@ -96,7 +96,7 @@ function runTestPasswordFieldOnDialog() {
   WindowObserver.prototype = {
     QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
 
-    observe(subject, topic, data) {
+    observe(subject, topic) {
       if (topic === "domwindowopened") {
         ok(true, "dialog window is created");
         dialog = subject;
diff --git a/widget/tests/test_key_event_counts.xhtml b/widget/tests/test_key_event_counts.xhtml
index 6eda6a52fb..e50164ddfd 100644
--- a/widget/tests/test_key_event_counts.xhtml
+++ b/widget/tests/test_key_event_counts.xhtml
@@ -24,7 +24,7 @@
     var gKeyPressEventCount = 0;
     var gKeyDownEventCount = 0;
 
-    function onKeyDown(e)
+    function onKeyDown()
     {
       gKeyDownEventCount++;
     }
diff --git a/widget/tests/test_keycodes.xhtml b/widget/tests/test_keycodes.xhtml
index aea6aaae98..5adb07b4d8 100644
--- a/widget/tests/test_keycodes.xhtml
+++ b/widget/tests/test_keycodes.xhtml
@@ -519,14 +519,14 @@ function* runKeyEventTests()
   document.addEventListener("keypress", onKeyEvent);
   document.addEventListener("keyup",    onKeyEvent);
   // Prevent almost all shortcut key handlers.
-  SpecialPowers.addSystemEventListener(document, "keypress", consumer, true);
+  SpecialPowers.wrap(document).addEventListener("keypress", consumer, { capture: true, mozSystemGroup: true });
 
   function cleanup()
   {
     document.removeEventListener("keydown",  onKeyEvent);
     document.removeEventListener("keypress", onKeyEvent);
     document.removeEventListener("keyup",    onKeyEvent);
-    SpecialPowers.removeSystemEventListener(document, "keypress", consumer, true);
+    SpecialPowers.wrap(document).removeEventListener("keypress", consumer, { capture: true, mozSystemGroup: true });
   }
 
   function* testKeysOnMac()
@@ -4802,7 +4802,7 @@ function* runAccessKeyTests()
   var button = document.getElementById("button");
   var activationCount;
 
-  function onClick(e)
+  function onClick()
   {
     ++activationCount;
   }
@@ -4968,10 +4968,10 @@ function* runXULKeyTests()
   buttonParent.addEventListener("keypress", onKeyInDefaultEventGroup, true);
   buttonParent.addEventListener("keydown", onKeyInDefaultEventGroup);
   buttonParent.addEventListener("keypress", onKeyInDefaultEventGroup);
-  SpecialPowers.addSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, true);
-  SpecialPowers.addSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, true);
-  SpecialPowers.addSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, false);
-  SpecialPowers.addSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, false);
+  SpecialPowers.wrap(buttonParent).addEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+  SpecialPowers.wrap(buttonParent).addEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+  SpecialPowers.wrap(buttonParent).addEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+  SpecialPowers.wrap(buttonParent).addEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
 
   function finializeKeyElementTest()
   {
@@ -4979,10 +4979,10 @@ function* runXULKeyTests()
     buttonParent.removeEventListener("keypress", onKeyInDefaultEventGroup, true);
     buttonParent.removeEventListener("keydown", onKeyInDefaultEventGroup);
     buttonParent.removeEventListener("keypress", onKeyInDefaultEventGroup);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, true);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, true);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keydown", onKeyInSystemEventGroup, false);
-    SpecialPowers.removeSystemEventListener(buttonParent, "keypress", onKeyInSystemEventGroup, false);
+    SpecialPowers.wrap(buttonParent).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(buttonParent).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(buttonParent).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+    SpecialPowers.wrap(buttonParent).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
   }
 
   // If aKeyElement is empty string, this function tests if the event kicks
@@ -5218,10 +5218,10 @@ function* runReservedKeyTests()
     contents[i].addEventListener("keypress", onKeyInDefaultEventGroup, true);
     contents[i].addEventListener("keydown", onKeyInDefaultEventGroup);
     contents[i].addEventListener("keypress", onKeyInDefaultEventGroup);
-    SpecialPowers.addSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, true);
-    SpecialPowers.addSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, true);
-    SpecialPowers.addSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, false);
-    SpecialPowers.addSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, false);
+    SpecialPowers.wrap(contents[i]).addEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(contents[i]).addEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+    SpecialPowers.wrap(contents[i]).addEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+    SpecialPowers.wrap(contents[i]).addEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
   }
 
   var keyEvents = [];
@@ -5256,10 +5256,10 @@ function* runReservedKeyTests()
       contents[i].removeEventListener("keypress", onKeyInDefaultEventGroup, true);
       contents[i].removeEventListener("keydown", onKeyInDefaultEventGroup);
       contents[i].removeEventListener("keypress", onKeyInDefaultEventGroup);
-      SpecialPowers.removeSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, true);
-      SpecialPowers.removeSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, true);
-      SpecialPowers.removeSystemEventListener(contents[i], "keydown", onKeyInSystemEventGroup, false);
-      SpecialPowers.removeSystemEventListener(contents[i], "keypress", onKeyInSystemEventGroup, false);
+      SpecialPowers.wrap(contents[i]).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+      SpecialPowers.wrap(contents[i]).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: true, mozSystemGroup: true });
+      SpecialPowers.wrap(contents[i]).removeEventListener("keydown", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
+      SpecialPowers.wrap(contents[i]).removeEventListener("keypress", onKeyInSystemEventGroup, { capture: false, mozSystemGroup: true });
     }
   }
 
diff --git a/widget/tests/test_native_key_bindings_mac.html b/widget/tests/test_native_key_bindings_mac.html
index 8767a5a77d..81a13aea0e 100644
--- a/widget/tests/test_native_key_bindings_mac.html
+++ b/widget/tests/test_native_key_bindings_mac.html
@@ -292,7 +292,7 @@
            aElement.id + ": Incorrect selection end");
       }
 
-      function* testRun(aElement, aSelectionCheck, aCallback) {
+      function* testRun(aElement, aSelectionCheck) {
         if (document.activeElement) {
           document.activeElement.blur();
         }
diff --git a/widget/tests/test_sizemode_events.xhtml b/widget/tests/test_sizemode_events.xhtml
index bd1e3a38d1..c1224fbf70 100644
--- a/widget/tests/test_sizemode_events.xhtml
+++ b/widget/tests/test_sizemode_events.xhtml
@@ -31,7 +31,7 @@ const kAsyncChanges = kIsLinux || kIsMacOS;
 let gSizeModeDidChange = false;
 let gSizeModeDidChangeTo = 0;
 
-function sizemodeChanged(e) {
+function sizemodeChanged() {
   gSizeModeDidChange = true;
   gSizeModeDidChangeTo = gWindow.windowState;
 }
diff --git a/widget/tests/window_bug478536.xhtml b/widget/tests/window_bug478536.xhtml
index 7318eb0bff..206226ec74 100644
--- a/widget/tests/window_bug478536.xhtml
+++ b/widget/tests/window_bug478536.xhtml
@@ -177,7 +177,7 @@ function fireWheelScrollEvent(aForward)
   }, window);
 }
 
-function onScrollView(aEvent)
+function onScrollView()
 {
   if (gIgnoreScrollEvent)
     return;
@@ -187,7 +187,7 @@ function onScrollView(aEvent)
   gTimer = setTimeout(runNextTest, 0);
 }
 
-function onMouseScrollFailed(aEvent)
+function onMouseScrollFailed()
 {
   clearTimer();
   gIgnoreScrollEvent = true;
@@ -197,7 +197,7 @@ function onMouseScrollFailed(aEvent)
   runNextTest();
 }
 
-function onTransactionTimeout(aEvent)
+function onTransactionTimeout()
 {
   if (!gTimer)
     return;
diff --git a/widget/tests/window_composition_text_querycontent.xhtml b/widget/tests/window_composition_text_querycontent.xhtml
index db3b10ea30..4806d0d187 100644
--- a/widget/tests/window_composition_text_querycontent.xhtml
+++ b/widget/tests/window_composition_text_querycontent.xhtml
@@ -6270,7 +6270,7 @@ function runQueryContentEventRelativeToInsertionPoint()
   synthesizeComposition({ type: "compositioncommitasis" });
 
   // Move start of composition at first compositionupdate event.
-  function onCompositionUpdate(aEvent)
+  function onCompositionUpdate()
   {
     startOffset = textarea.selectionStart = textarea.selectionEnd = textarea.selectionStart - 1;
     textarea.removeEventListener("compositionupdate", onCompositionUpdate);
diff --git a/widget/tests/window_imestate_iframes.html b/widget/tests/window_imestate_iframes.html
index c8b182977f..3c2d0908ae 100644
--- a/widget/tests/window_imestate_iframes.html
+++ b/widget/tests/window_imestate_iframes.html
@@ -49,6 +49,8 @@ function onUnload() {
 
 var gFocusObservingElement = null;
 var gBlurObservingElement = null;
+var canTabMoveFocusToRootElement =
+  !SpecialPowers.getBoolPref("dom.disable_tab_focus_to_root_element");
 
 function onFocus(aEvent) {
   if (aEvent.target != gFocusObservingElement) {
@@ -201,18 +203,30 @@ function runTests() {
   root = iframe.contentDocument.documentElement;
   resetFocusToInput("initializing for iframe_not_editable");
 
-  testTabKey(true, root, false, prev, true,
-             false, "input#prev[readonly] -> html");
-  testTabKey(true, editor, true, root, false,
-             true, "html -> input in the subdoc");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(true, root, false, prev, true,
+               false, "input#prev[readonly] -> html");
+    testTabKey(true, editor, true, root, false,
+               true, "html -> input in the subdoc");
+  } else {
+    testTabKey(true, editor, true, prev, true,
+               true, "input#prev[readonly] -> input in the subdoc");
+  }
   testTabKey(true, next, true, editor, true,
              false, "input in the subdoc -> input#next[readonly]");
   testTabKey(false, editor, true, next, true,
              true, "input#next[readonly] -> input in the subdoc");
-  testTabKey(false, root, false, editor, true,
-             false, "input in the subdoc -> html");
-  testTabKey(false, prev, true, root, false,
-             false, "html -> input#next[readonly]");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, root, false, editor, true,
+               false, "input in the subdoc -> html");
+    testTabKey(false, prev, true, root, false,
+               false, "html -> input#next[readonly]");
+  } else {
+    testTabKey(false, prev, true, editor, true,
+               false, "input in the subdoc -> input#prev[readonly]");
+    testTabKey(false, next, true, prev, true,
+               false, "input#prev[readonly] -> input#next[readonly]");
+  }
 
   iframe.style.display = "none";
 
@@ -236,8 +250,13 @@ function runTests() {
   resetFocusToParentHTML("testing iframe_html");
   testTabKey(true, editor, true, html, false,
              true, "html of parent -> html[contentediable=true]");
-  testTabKey(false, html, false, editor, true,
-             false, "html[contenteditable=true] -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, html, false, editor, true,
+               false, "html[contenteditable=true] -> html of parent");
+  } else {
+    testTabKey(false, next, true, editor, true,
+               false, "html[contenteditable=true] -> input#next[readonly]");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> html[contenteditable=true]");
 
@@ -270,8 +289,13 @@ function runTests() {
   resetFocusToParentHTML("testing iframe_designMode");
   testTabKey(true, root, false, html, false,
              true, "html of parent -> html in designMode");
-  testTabKey(false, html, false, root, false,
-             false, "html in designMode -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, html, false, root, false,
+               false, "html[contenteditable=true] -> html of parent");
+  } else {
+    testTabKey(false, next, true, root, false,
+               false, "html in designMode -> html of parent");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> html in designMode");
 
@@ -302,8 +326,13 @@ function runTests() {
   resetFocusToParentHTML("testing iframe_body");
   testTabKey(true, editor, true, html, false,
              true, "html of parent -> body[contentediable=true]");
-  testTabKey(false, html, false, editor, true,
-             false, "body[contenteditable=true] -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, html, false, editor, true,
+               false, "body[contenteditable=true] -> html of parent");
+  } else {
+    testTabKey(false, next, true, editor, true,
+               false, "body[contenteditable=true] -> input#next[readonly]");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> body[contenteditable=true]");
 
@@ -321,25 +350,44 @@ function runTests() {
   root = iframe.contentDocument.documentElement;
   resetFocusToInput("initializing for iframe_p");
 
-  testTabKey(true, root, false, prev, true,
-             false, "input#prev[readonly] -> html (has p[contenteditable=true])");
-  testTabKey(true, editor, true, root, false,
-             true, "html (has p[contenteditable=true]) -> p[contentediable=true]");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(true, root, false, prev, true,
+               false, "input#prev[readonly] -> html (has p[contenteditable=true])");
+    testTabKey(true, editor, true, root, false,
+               true, "html (has p[contenteditable=true]) -> p[contentediable=true]");
+  } else {
+    testTabKey(true, editor, true, prev, true,
+               true, "input#prev[readonly] -> p[contenteditable=true]");
+  }
   testTabKey(true, next, true, editor, true,
              false, "p[contentediable=true] -> input#next[readonly]");
   testTabKey(false, editor, true, next, true,
              true, "input#next[readonly] -> p[contentediable=true]");
-  testTabKey(false, root, false, editor, true,
-             false, "p[contenteditable=true] -> html (has p[contenteditable=true])");
-  testTabKey(false, prev, true, root, false,
-             false, "html (has p[contenteditable=true]) -> input#prev[readonly]");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(false, root, false, editor, true,
+               false, "p[contenteditable=true] -> html (has p[contenteditable=true])");
+    testTabKey(false, prev, true, root, false,
+               false, "html (has p[contenteditable=true]) -> input#prev[readonly]");
+  } else {
+    testTabKey(false, prev, true, editor, true,
+               false, "p[contenteditable=true] -> html (has p[contenteditable=true])");
+    testTabKey(false, next, true, prev, true,
+               false, "html (has p[contenteditable=true]) -> input#next[readonly]");
+  }
   prev.style.display = "none";
 
   resetFocusToParentHTML("testing iframe_p");
-  testTabKey(true, root, false, html, false,
-             false, "html of parent -> html (has p[contentediable=true])");
-  testTabKey(false, html, false, root, false,
-             false, "html (has p[contentediable=true]) -> html of parent");
+  if (canTabMoveFocusToRootElement) {
+    testTabKey(true, root, false, html, false,
+               false, "html of parent -> html (has p[contentediable=true])");
+    testTabKey(false, html, false, root, false,
+               false, "html (has p[contentediable=true]) -> html of parent");
+  } else {
+    testTabKey(true, editor, true, html, false,
+               true, "html of parent -> p[contentediable=true]");
+    testTabKey(false, next, true, editor, true,
+               false, "p[contentediable=true] -> input#next[readonly]");
+  }
   prev.style.display = "inline";
   resetFocusToInput("after parent html <-> html (has p[contentediable=true])");
 
diff --git a/widget/tests/window_mouse_scroll_win.html b/widget/tests/window_mouse_scroll_win.html
index bf90abb1b5..48ccc1fed4 100644
--- a/widget/tests/window_mouse_scroll_win.html
+++ b/widget/tests/window_mouse_scroll_win.html
@@ -214,7 +214,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -234,7 +234,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -250,7 +250,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -270,7 +270,7 @@ var gPreparingSteps = [
     target: gP1, x: 10, y: 10, window,
     modifiers: 0,
     additionalFlags: 0,
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       return true;
     },
     onPixelScrollEvent(aEvent) {
@@ -1100,7 +1100,7 @@ var gDeactiveWindowTests = [
       SpecialPowers.setIntPref(kVAmountPref, 3);
       SpecialPowers.setIntPref(kHAmountPref, 3);
     },
-    onLineScrollEvent(aEvent) {
+    onLineScrollEvent() {
       var fm = Services.focus;
       is(fm.activeWindow, gOtherWindow, "The other window isn't activated");
     },