diff --git a/js/tests/js1_5/Regress/regress-334807-01.js b/js/tests/js1_5/Regress/regress-334807-01.js
new file mode 100755
index 000000000000..3490fedefc92
--- /dev/null
+++ b/js/tests/js1_5/Regress/regress-334807-01.js
@@ -0,0 +1,55 @@
+/* -*- 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Andreas
+ *
+ * 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 = 334807;
+var summary = '10.1.8 - arguments prototype is the original Object prototype';
+var actual = 'No Error';
+var expect = 'TypeError';
+
+printBugNumber (bug);
+printStatus (summary);
+
+try
+{
+  (function () { printStatus( arguments.join()); })( 1, 2, 3 );  
+}
+catch(ex)
+{
+  printStatus(ex + '');
+  actual = ex.name;
+}
+reportCompare(expect, actual, summary);
diff --git a/js/tests/js1_5/Regress/regress-334807-02.js b/js/tests/js1_5/Regress/regress-334807-02.js
new file mode 100755
index 000000000000..d7dc477aecd7
--- /dev/null
+++ b/js/tests/js1_5/Regress/regress-334807-02.js
@@ -0,0 +1,59 @@
+/* -*- 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Andreas
+ *
+ * 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 = 334807;
+var summary = '10.1.8 - arguments prototype is the original Object prototype.';
+var actual = 'No Error';
+var expect = 'TypeError';
+
+printBugNumber (bug);
+printStatus (summary);
+
+printStatus('set Object = Array');
+
+Object = Array;
+
+try
+{
+  (function () { printStatus( arguments.join()); })( 1, 2, 3 );  
+}
+catch(ex)
+{
+  printStatus(ex + '');
+  actual = ex.name;
+}
+reportCompare(expect, actual, summary);
diff --git a/js/tests/js1_5/Regress/regress-334807-03.js b/js/tests/js1_5/Regress/regress-334807-03.js
new file mode 100755
index 000000000000..c37addc43938
--- /dev/null
+++ b/js/tests/js1_5/Regress/regress-334807-03.js
@@ -0,0 +1,55 @@
+/* -*- 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Andreas
+ *
+ * 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 = 334807;
+var summary = '10.1.8 - arguments prototype is the original Object prototype';
+var actual = 'No Error';
+var expect = 'TypeError';
+
+printBugNumber (bug);
+printStatus (summary);
+
+try
+{
+  0, function () { printStatus( arguments.join()); }( 1, 2, 3 );  
+}
+catch(ex)
+{
+  printStatus(ex + '');
+  actual = ex.name;
+}
+reportCompare(expect, actual, summary);
diff --git a/js/tests/js1_5/Regress/regress-334807-04.js b/js/tests/js1_5/Regress/regress-334807-04.js
new file mode 100755
index 000000000000..bf6af3acaaab
--- /dev/null
+++ b/js/tests/js1_5/Regress/regress-334807-04.js
@@ -0,0 +1,59 @@
+/* -*- 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Andreas
+ *
+ * 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 = 334807;
+var summary = '10.1.8 - arguments prototype is the original Object prototype.';
+var actual = 'No Error';
+var expect = 'TypeError';
+
+printBugNumber (bug);
+printStatus (summary);
+
+printStatus('set Object = Array');
+
+Object = Array;
+
+try
+{
+  0, function () { printStatus( arguments.join()); }( 1, 2, 3 );  
+}
+catch(ex)
+{
+  printStatus(ex + '');
+  actual = ex.name;
+}
+reportCompare(expect, actual, summary);
diff --git a/js/tests/js1_5/Regress/regress-334807-05.js b/js/tests/js1_5/Regress/regress-334807-05.js
new file mode 100755
index 000000000000..d5ad7d85dda9
--- /dev/null
+++ b/js/tests/js1_5/Regress/regress-334807-05.js
@@ -0,0 +1,64 @@
+/* -*- 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Andreas
+ *
+ * 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 = 334807;
+var summary = '12.14 - exception prototype is the original Object prototype.';
+var actual = 'No Error';
+var expect = 'ReferenceError';
+
+printBugNumber (bug);
+printStatus (summary);
+
+try 
+{
+  x.y;
+}
+catch(ex) 
+{
+  try
+  {
+    actual = ex.name;
+    printStatus(ex + ': x.y');
+    ex.valueOf();
+  }
+  catch(ex2)
+  {
+    printStatus(ex2 + ': ex.valueOf()');
+    actual = ex2.name;
+  }
+}
+reportCompare(expect, actual, summary);
diff --git a/js/tests/js1_5/Regress/regress-334807-06.js b/js/tests/js1_5/Regress/regress-334807-06.js
new file mode 100755
index 000000000000..cf0304de7125
--- /dev/null
+++ b/js/tests/js1_5/Regress/regress-334807-06.js
@@ -0,0 +1,68 @@
+/* -*- 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) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Andreas
+ *
+ * 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 = 334807;
+var summary = '12.14 - exception prototype is the original Object prototype.';
+var actual = 'No Error';
+var expect = 'ReferenceError';
+
+printBugNumber (bug);
+printStatus (summary);
+
+printStatus('set Error = Number');
+
+Error = Number;
+
+try 
+{
+  x.y;
+}
+catch(ex) 
+{
+  try
+  {
+    actual = ex.name;
+    printStatus(ex + ': x.y');
+    ex.valueOf();
+  }
+  catch(ex2)
+  {
+    printStatus(ex2 + ': ex.valueOf()');
+    actual = ex2.name;
+  }
+}
+reportCompare(expect, actual, summary);