diff --git a/mozilla/js/tests/e4x/Namespace/regress-350442.js b/mozilla/js/tests/e4x/Namespace/regress-350442.js
new file mode 100755
index 00000000000..c85e83a47f2
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+++ b/mozilla/js/tests/e4x/Namespace/regress-350442.js
@@ -0,0 +1,56 @@
+/* -*- Mode: java; tab-width:8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/* ***** 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Lubos Ures
+ *
+ * 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 = 350442;
+var summary = 'toXMLString with namespace definitions';
+var actual = '';
+var expect = '';
+
+printBugNumber (bug);
+printStatus (summary);
+
+var t1 = <tag1 xmlns="http://ns1"/>;
+var n2 = new Namespace("http://ns2");
+t1.@n2::a1="a1 from ns2";
+
+expect = (<tag1 xmlns="http://ns1" xmlns:ns2="http://ns2" ns2:a1="a1 from ns2"/>).toXMLString();
+actual = t1.toXMLString();
+
+TEST(1, expect, actual);
+
+END();