diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-407720.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-407720.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+// |reftest| skip-if(!xulRuntime.shell) slow
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 407720;
+var summary = 'js_FindClassObject causes crashes with getter/setter - Browser only';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+// stop the test after 60 seconds
+var start = new Date();
+
+if (typeof document != 'undefined')
+{ 
+  // delay test driver end
+  gDelayTestDriverEnd = true;
+  document.write('<iframe onload="onLoad()"><\/iframe>');
+}
+else
+{
+  actual = 'No Crash';
+  reportCompare(expect, actual, summary);
+}
+
+function onLoad() 
+{
+
+  if ( (new Date() - start) < 60*1000)
+  {
+    var x = frames[0].Window.prototype;
+    x.a = x.b = x.c = 1;
+    x.__defineGetter__("HTML document.all class", function() {});
+    frames[0].document.all;
+
+    // retry
+    frames[0].location = "about:blank";
+  }
+  else
+  {
+    actual = 'No Crash';
+
+    reportCompare(expect, actual, summary);
+    gDelayTestDriverEnd = false;
+    jsTestDriverEnd();
+  }
+}