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diff --git a/browser/base/content/test/general/browser_contentAltClick.js b/browser/base/content/test/general/browser_contentAltClick.js
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+++ b/browser/base/content/test/general/browser_contentAltClick.js
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+/* 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/. */
+
+/**
+ * Test for Bug 1109146.
+ * The tests opens a new tab and alt + clicks to download files
+ * and confirms those files are on the download list.
+ *
+ * The difference between this and the test "browser_contentAreaClick.js" is that
+ * the code path in e10s uses the ClickHandler actor instead of browser.js::contentAreaClick() util.
+ */
+"use strict";
+
+ChromeUtils.defineESModuleGetters(this, {
+  Downloads: "resource://gre/modules/Downloads.sys.mjs",
+});
+
+function setup() {
+  Services.prefs.setBoolPref("browser.altClickSave", true);
+
+  let testPage =
+    "data:text/html," +
+    '<p><a id="commonlink" href="http://mochi.test/moz/">Common link</a></p>' +
+    '<p><math id="mathlink" xmlns="http://www.w3.org/1998/Math/MathML" href="http://mochi.test/moz/"><mtext>MathML XLink</mtext></math></p>' +
+    '<p><svg id="svgxlink" xmlns="http://www.w3.org/2000/svg" width="100px" height="50px" version="1.1"><a xlink:type="simple" xlink:href="http://mochi.test/moz/"><text transform="translate(10, 25)">SVG XLink</text></a></svg></p><br>' +
+    '<span id="host"></span><script>document.getElementById("host").attachShadow({mode: "closed"}).appendChild(document.getElementById("commonlink").cloneNode(true));</script>' +
+    '<iframe id="frame" src="https://test2.example.com:443/browser/browser/base/content/test/general/file_with_link_to_http.html"></iframe>';
+
+  return BrowserTestUtils.openNewForegroundTab(gBrowser, testPage);
+}
+
+async function clean_up() {
+  // Remove downloads.
+  let downloadList = await Downloads.getList(Downloads.ALL);
+  let downloads = await downloadList.getAll();
+  for (let download of downloads) {
+    await downloadList.remove(download);
+    await download.finalize(true);
+  }
+  // Remove download history.
+  await PlacesUtils.history.clear();
+
+  Services.prefs.clearUserPref("browser.altClickSave");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+}
+
+add_task(async function test_alt_click() {
+  await setup();
+
+  let downloadList = await Downloads.getList(Downloads.ALL);
+  let downloads = [];
+  let downloadView;
+  // When 1 download has been attempted then resolve the promise.
+  let finishedAllDownloads = new Promise(resolve => {
+    downloadView = {
+      onDownloadAdded(aDownload) {
+        downloads.push(aDownload);
+        resolve();
+      },
+    };
+  });
+  await downloadList.addView(downloadView);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#commonlink",
+    { altKey: true },
+    gBrowser.selectedBrowser
+  );
+
+  // Wait for all downloads to be added to the download list.
+  await finishedAllDownloads;
+  await downloadList.removeView(downloadView);
+
+  is(downloads.length, 1, "1 downloads");
+  is(
+    downloads[0].source.url,
+    "http://mochi.test/moz/",
+    "Downloaded #commonlink element"
+  );
+
+  await clean_up();
+});
+
+add_task(async function test_alt_click_shadow_dom() {
+  await setup();
+
+  let downloadList = await Downloads.getList(Downloads.ALL);
+  let downloads = [];
+  let downloadView;
+  // When 1 download has been attempted then resolve the promise.
+  let finishedAllDownloads = new Promise(resolve => {
+    downloadView = {
+      onDownloadAdded(aDownload) {
+        downloads.push(aDownload);
+        resolve();
+      },
+    };
+  });
+  await downloadList.addView(downloadView);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#host",
+    { altKey: true },
+    gBrowser.selectedBrowser
+  );
+
+  // Wait for all downloads to be added to the download list.
+  await finishedAllDownloads;
+  await downloadList.removeView(downloadView);
+
+  is(downloads.length, 1, "1 downloads");
+  is(
+    downloads[0].source.url,
+    "http://mochi.test/moz/",
+    "Downloaded #commonlink element in shadow DOM."
+  );
+
+  await clean_up();
+});
+
+add_task(async function test_alt_click_on_xlinks() {
+  await setup();
+
+  let downloadList = await Downloads.getList(Downloads.ALL);
+  let downloads = [];
+  let downloadView;
+  // When all 2 downloads have been attempted then resolve the promise.
+  let finishedAllDownloads = new Promise(resolve => {
+    downloadView = {
+      onDownloadAdded(aDownload) {
+        downloads.push(aDownload);
+        if (downloads.length == 2) {
+          resolve();
+        }
+      },
+    };
+  });
+  await downloadList.addView(downloadView);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#mathlink",
+    { altKey: true },
+    gBrowser.selectedBrowser
+  );
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#svgxlink",
+    { altKey: true },
+    gBrowser.selectedBrowser
+  );
+
+  // Wait for all downloads to be added to the download list.
+  await finishedAllDownloads;
+  await downloadList.removeView(downloadView);
+
+  is(downloads.length, 2, "2 downloads");
+  is(
+    downloads[0].source.url,
+    "http://mochi.test/moz/",
+    "Downloaded #mathlink element"
+  );
+  is(
+    downloads[1].source.url,
+    "http://mochi.test/moz/",
+    "Downloaded #svgxlink element"
+  );
+
+  await clean_up();
+});
+
+// Alt+Click a link in a frame from another domain as the outer document.
+add_task(async function test_alt_click_in_frame() {
+  await setup();
+
+  let downloadList = await Downloads.getList(Downloads.ALL);
+  let downloads = [];
+  let downloadView;
+  // When the download has been attempted, resolve the promise.
+  let finishedAllDownloads = new Promise(resolve => {
+    downloadView = {
+      onDownloadAdded(aDownload) {
+        downloads.push(aDownload);
+        resolve();
+      },
+    };
+  });
+
+  await downloadList.addView(downloadView);
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#linkToExample",
+    { altKey: true },
+    gBrowser.selectedBrowser.browsingContext.children[0]
+  );
+
+  // Wait for all downloads to be added to the download list.
+  await finishedAllDownloads;
+  await downloadList.removeView(downloadView);
+
+  is(downloads.length, 1, "1 downloads");
+  is(
+    downloads[0].source.url,
+    "http://example.org/",
+    "Downloaded link in iframe."
+  );
+
+  await clean_up();
+});