diff -r 000000000000 -r 6474c204b198 dom/browser-element/mochitest/browserElement_TargetBlank.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/browser-element/mochitest/browserElement_TargetBlank.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 764718 - Test that clicking a link with _target=blank works.
+
+"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) {
+    is(e.detail.url, 'http://example.com/');
+    e.preventDefault();
+    SimpleTest.finish();
+  });
+
+  iframe.src = "file_browserElement_TargetBlank.html";
+  document.body.appendChild(iframe);
+}
+
+addEventListener('testready', runTest);