diff -r 000000000000 -r 6474c204b198 dom/browser-element/mochitest/browserElement_AppWindowNamespace.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/browser-element/mochitest/browserElement_AppWindowNamespace.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 780351 - Test that mozapp divides the window name namespace.
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.addPermission();
+// Permission to embed an app.
+SpecialPowers.addPermission("embed-apps", true, document);
+
+function runTest() {
+
+  var iframe1 = document.createElement('iframe');
+  SpecialPowers.wrap(iframe1).mozbrowser = true;
+  iframe1.setAttribute('mozapp', 'http://example.org/manifest.webapp');
+
+  // Two mozapp frames for different apps with the same code both do the same
+  // window.open("foo", "bar") call.  We should get two mozbrowseropenwindow
+  // events.
+
+  iframe1.addEventListener('mozbrowseropenwindow', function(e) {
+    ok(true, "Got first mozbrowseropenwindow event.");
+    document.body.appendChild(e.detail.frameElement);
+
+    SimpleTest.executeSoon(function() {
+      var iframe2 = document.createElement('iframe');
+      SpecialPowers.wrap(iframe2).mozbrowser = true;
+      iframe2.setAttribute('mozapp', 'http://example.com/manifest.webapp');
+
+      iframe2.addEventListener('mozbrowseropenwindow', function(e) {
+        ok(true, "Got second mozbrowseropenwindow event.");
+        SpecialPowers.removePermission("embed-apps", document);
+
+        // We're not going to open this, but we don't want the platform to either
+        e.preventDefault();
+        SimpleTest.finish();
+      });
+
+      document.body.appendChild(iframe2);
+      iframe2.src = 'http://example.com/tests/dom/browser-element/mochitest/file_browserElement_AppWindowNamespace.html';
+    });
+  });
+
+  document.body.appendChild(iframe1);
+  iframe1.src = 'http://example.org/tests/dom/browser-element/mochitest/file_browserElement_AppWindowNamespace.html';
+}
+
+addEventListener('testready', runTest);