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diff --git a/js/src/tests/non262/regress/regress-168347.js b/js/src/tests/non262/regress/regress-168347.js
new file mode 100644
index 0000000000..cdacb78a53
--- /dev/null
+++ b/js/src/tests/non262/regress/regress-168347.js
@@ -0,0 +1,183 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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/. */
+
+/*
+ *
+ * Date:    13 Sep 2002
+ * SUMMARY: Testing F.toString()
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=168347
+ *
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 168347;
+var summary = "Testing F.toString()";
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+var FtoString = '';
+var sFunc = '';
+
+sFunc += 'function F()';
+sFunc += '{';
+sFunc += '  var f = arguments.callee;';
+sFunc += '  f.i = 0;';
+sFunc += '';
+sFunc += '  try';
+sFunc += '  {';
+sFunc += '    f.i = f.i + 1;';
+sFunc += '    print("i = i+1 succeeded \ti = " + f.i);';
+sFunc += '  }';
+sFunc += '  catch(e)';
+sFunc += '  {';
+sFunc += '    print("i = i+1 failed with " + e + "\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '';
+sFunc += '  try';
+sFunc += '  {';
+sFunc += '    ++f.i;';
+sFunc += '    print("++i succeeded \t\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '  catch(e)';
+sFunc += '  {';
+sFunc += '    print("++i failed with " + e + "\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '';
+sFunc += '  try';
+sFunc += '  {';
+sFunc += '    f.i++;';
+sFunc += '    print("i++ succeeded \t\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '  catch(e)';
+sFunc += '  {';
+sFunc += '    print("i++ failed with " + e + "\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '';
+sFunc += '  try';
+sFunc += '  {';
+sFunc += '    --f.i;';
+sFunc += '    print("--i succeeded \t\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '  catch(e)';
+sFunc += '  {';
+sFunc += '    print("--i failed with " + e + "\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '';
+sFunc += '  try';
+sFunc += '  {';
+sFunc += '    f.i--;';
+sFunc += '    print("i-- succeeded \t\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '  catch(e)';
+sFunc += '  {';
+sFunc += '    print("i-- failed with " + e + "\ti = " + f.i);';
+sFunc += '  }';
+sFunc += '}';
+
+
+/*
+ * Use sFunc to define the function F. The test
+ * then rests on comparing F.toString() to sFunc.
+ */
+eval(sFunc);
+
+
+/*
+ * There are trivial whitespace differences between F.toString()
+ * and sFunc. So strip out whitespace before comparing them -
+ */
+sFunc = stripWhite(sFunc);
+FtoString = stripWhite(F.toString());
+
+
+/*
+ * Break comparison into sections to make any failures
+ * easier for the developer to track down -
+ */
+status = inSection(1);
+actual = FtoString.substring(0,100);
+expect = sFunc.substring(0,100);
+addThis();
+
+status = inSection(2);
+actual = FtoString.substring(100,200);
+expect = sFunc.substring(100,200);
+addThis();
+
+status = inSection(3);
+actual = FtoString.substring(200,300);
+expect = sFunc.substring(200,300);
+addThis();
+
+status = inSection(4);
+actual = FtoString.substring(300,400);
+expect = sFunc.substring(300,400);
+addThis();
+
+status = inSection(5);
+actual = FtoString.substring(400,500);
+expect = sFunc.substring(400,500);
+addThis();
+
+status = inSection(6);
+actual = FtoString.substring(500,600);
+expect = sFunc.substring(500,600);
+addThis();
+
+status = inSection(7);
+actual = FtoString.substring(600,700);
+expect = sFunc.substring(600,700);
+addThis();
+
+status = inSection(8);
+actual = FtoString.substring(700,800);
+expect = sFunc.substring(700,800);
+addThis();
+
+status = inSection(9);
+actual = FtoString.substring(800,900);
+expect = sFunc.substring(800,900);
+addThis();
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+/*
+ * Remove any whitespace characters; also
+ * any escaped tabs or escaped newlines.
+ */
+function stripWhite(str)
+{
+  var re = /\s|\\t|\\n/g;
+  return str.replace(re, '');
+}
+
+
+function test()
+{
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+}