diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-233483.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-233483.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* -*- 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 = 233483;
+var summary = 'Don\'t crash with null properties - Browser only';
+var actual = 'Crash';
+var expect = 'No Crash';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+if (typeof document != 'undefined')
+{ 
+  // delay test driver end
+  gDelayTestDriverEnd = true;
+  window.onload = onLoad;
+}
+else
+{
+  actual = 'No Crash';
+  reportCompare(expect, actual, summary);
+}
+
+function onLoad() {
+  setform();
+  var a=new Array();
+  var forms = document.getElementsByTagName('form');
+  a[a.length]=forms[0];
+  var s=a.toString();
+
+  actual = 'No Crash';
+
+  reportCompare(expect, actual, summary);
+  gDelayTestDriverEnd = false;
+  jsTestDriverEnd();
+
+}
+
+function setform()
+{
+  var form = document.body.appendChild(document.createElement('form'));
+  var input = form.appendChild(document.createElement('input'));
+  input.setAttribute('id', 'test');
+  input.setAttribute('value', '1232');
+
+  var result = form.toString();
+
+}