diff -r 000000000000 -r 6474c204b198 dom/browser-element/mochitest/browserElement_OpenWindowDifferentOrigin.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/browser-element/mochitest/browserElement_OpenWindowDifferentOrigin.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 769182 - window.open to a different origin should load the page.
+
+"use strict";
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.addPermission();
+
+function runTest() {
+  var iframe = document.createElement('iframe');
+  SpecialPowers.wrap(iframe).mozbrowser = true;
+
+  iframe.addEventListener('mozbrowseropenwindow', function(e) {
+    ok(true, 'Got first window.open call');
+
+    e.detail.frameElement.addEventListener('mozbrowseropenwindow', function(e) {
+      ok(true, 'Got second window.open call');
+      document.body.appendChild(e.detail.frameElement);
+    });
+
+    e.detail.frameElement.addEventListener('mozbrowsershowmodalprompt', function(e) {
+      ok(true, 'Got alert from second window.');
+      SimpleTest.finish();
+    });
+
+    document.body.appendChild(e.detail.frameElement);
+  });
+
+  // DifferentOrigin.html?1 calls
+  //
+  //   window.open('http://example.com/.../DifferentOrigin.html?2'),
+  //
+  // which calls alert().
+
+  iframe.src = 'http://example.org/tests/dom/browser-element/mochitest/file_browserElement_OpenWindowDifferentOrigin.html?1';
+  document.body.appendChild(iframe);
+}
+
+addEventListener('testready', runTest);