diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-327608.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-327608.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* -*- 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 = 327608;
+var summary = 'Do not assume we will find the prototype property';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+print('This test runs only in the browser');
+ 
+function countProps(obj)
+{
+  var c;
+  for (var prop in obj)
+    ++c;
+  return c;
+}
+
+function init()
+{
+  var inp = document.getElementsByTagName("input")[0];
+  countProps(inp);
+  gc();
+  var blurfun = inp.blur;
+  blurfun.__proto__ = null;
+  countProps(blurfun);
+  reportCompare(expect, actual, summary);
+  gDelayTestDriverEnd = false;
+  jsTestDriverEnd();
+}
+
+if (typeof window != 'undefined')
+{
+  // delay test driver end
+  gDelayTestDriverEnd = true;
+
+  document.write('<input>');
+  window.addEventListener("load", init, false);
+}
+else
+{
+  reportCompare(expect, actual, summary);
+}