diff --git a/mozilla/js/tests/js1_5/Regress/regress-303213.js b/mozilla/js/tests/js1_5/Regress/regress-303213.js
new file mode 100755
index 00000000000..30b28a97707
--- /dev/null
+++ b/mozilla/js/tests/js1_5/Regress/regress-303213.js
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2005
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Georgi Guninski 
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+//-----------------------------------------------------------------------------
+var bug = 303213;
+var summary = 'integer overflow in js';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+printBugNumber (bug);
+printStatus (summary);
+
+var s=String.fromCharCode(257);
+
+var ki="";
+var me="";
+for (i = 0; i < 1024; i++)
+{
+  ki = ki + s;
+}
+
+for (i = 0; i < 1024; i++)
+{
+  me = me + ki;
+}
+
+var ov = s;
+
+for (i = 0; i < 28; i++) 
+  ov += ov;
+
+for (i = 0; i < 88; i++) 
+  ov += me;
+	
+printStatus("done generating");
+var eov = escape(ov);
+printStatus("done escape");
+printStatus(eov);
+  
+reportCompare(expect, actual, summary);