diff -r 000000000000 -r 6474c204b198 js/src/tests/supporting/test402-browser.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/supporting/test402-browser.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* 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/. */
+
+/*
+ * Undo at least the damage done by taintArray so that the jstests
+ * harness won't die. The properties added to Object.prototype by the various
+ * tests have names that are less likely to cause trouble.
+ */
+setRestoreFunction((function () {
+    var Array_indexOf = Array.prototype.indexOf;
+    var Array_join = Array.prototype.join;
+    var Array_push = Array.prototype.push;
+    var Array_slice = Array.prototype.slice;
+    var Array_sort = Array.prototype.sort;
+    return function () {
+        delete Array.prototype["0"];
+        Array.prototype.indexOf = Array_indexOf;
+        Array.prototype.join = Array_join;
+        Array.prototype.push = Array_push;
+        Array.prototype.slice = Array_slice;
+        Array.prototype.sort = Array_sort;
+    };
+}()));