diff --git a/js/tests/js1_5/Regress/regress-416628.js b/js/tests/js1_5/Regress/regress-416628.js
new file mode 100755
index 00000000000..89afa92ed43
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+++ b/js/tests/js1_5/Regress/regress-416628.js
@@ -0,0 +1,142 @@
+/* -*- 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) 2007
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Brendan Eich
+ *
+ * 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 gTestfile = 'regress-416628.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 416628;
+var summary = 'O(n^2) blowup due to overlong cx->tempPool arena list';
+var actual = '';
+var expect = '';
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var data = {X:[], Y:[]};
+
+  Function.prototype.inherits = function(parentCtor) {
+    moo_inherits(this, parentCtor);
+  };
+
+  moo_inherits = function(childCtor, parentCtor) {
+    /** @constructor */
+    function tempCtor() {};
+    tempCtor.prototype = parentCtor.prototype;
+    childCtor.superClass_ = parentCtor.prototype;
+    childCtor.prototype = new tempCtor();
+    childCtor.prototype.constructor = childCtor;
+  };
+
+  var jstart =  100;
+  var jstop  = 1000;
+  var jinterval = (jstop - jstart)/9;
+
+  if (true) { 
+    for (var j = jstart; j < jstop; j += jinterval)
+    {
+      data.X.push(j);
+      var code = '';
+      for (var i = 0; i < j; i++)
+      {
+        code += createCode(i);
+      }
+      gc();
+      var start = new Date();
+      eval(code);
+      var stop = new Date();
+      data.Y.push(stop - start);
+    }
+  }
+
+  var order = BigO(data);
+
+  var msg = '';
+  for (var p = 0; p < data.X.length; p++)
+  {
+    msg += '(' + data.X[p] + ', ' + data.Y[p] + '); ';
+  }
+  printStatus(msg);
+  printStatus('Order: ' + order);
+
+  reportCompare(true, order < 2, 'BigO ' + order + ' < 2');
+
+  exitFunc ('test');
+}
+
+function createCode(i)
+{
+  var code = '';
+
+  code += "var str1_" + i + "='This is 1 a test " + i + " string.';";
+  code += "var str2_" + i + "='This is 2 a test " + i + " string.';";
+  code += "var str3_" + i + "='This is 3 a test " + i + " string.';";
+  code += "var str4_" + i + "='This is 4 a test " + i + " string.';";
+  code += "var str5_" + i + "='This is 5 a test " + i + " string.';";
+  code += "var str6_" + i + "='This is 6 a test " + i + " string.';";
+  code += "var str7_" + i + "='This is 7 a test " + i + " string.';";
+  code += "";
+  code += "var base" + i + " = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".f1 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f2 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f3 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f4 = function() {this.a_=4;this.b_=5};";
+  code += "base" + i + ".prototype.f5 = function() {this.a_=4;this.b_=5};";
+  code += "";
+  code += "var child" + i + " = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".inherits(base" + i + ");";
+  code += "child" + i + ".f1 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f2 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f3 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f4 = function() {this.a_=4;this.b_=5};";
+  code += "child" + i + ".prototype.f5 = function() {this.a_=4;this.b_=5};";
+  code += "";
+  code += "var gchild" + i + " = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".inherits(child" + i + ");";
+  code += "gchild" + i + ".f1 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f2 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f3 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f4 = function() {this.a_=4;this.b_=5};";
+  code += "gchild" + i + ".prototype.f5 = function() {this.a_=4;this.b_=5};";
+
+  return code;
+}