diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-363988.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-363988.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* -*- 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 = 363988;
+var summary = 'Do not crash at JS_GetPrivate with large script';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  function crash() {
+    var town = new Array;
+
+    for (var i = 0; i < 0x4001; ++i) {
+      var si = String(i);
+      town[i] = [ si, "x" + si, "y" + si, "z" + si ];
+    }
+
+    return "town=" + uneval(town) + ";function f() {}";
+  }
+
+  if (typeof document != "undefined")
+  {
+    // this is required to reproduce the crash.
+    document.write("<script>", crash(), "<\/script>");
+  }
+  else
+  {
+    crash();
+  }
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}