diff -r 000000000000 -r 6474c204b198 xpcom/string/src/nsStringComparator.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/string/src/nsStringComparator.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#include <ctype.h>
+#include "nsAString.h"
+#include "plstr.h"
+
+
+  // define nsStringComparator
+#include "string-template-def-unichar.h"
+#include "nsTStringComparator.cpp"
+#include "string-template-undef.h"
+
+  // define nsCStringComparator
+#include "string-template-def-char.h"
+#include "nsTStringComparator.cpp"
+#include "string-template-undef.h"
+
+
+int
+nsCaseInsensitiveCStringComparator::operator()( const char_type* lhs,
+                                                const char_type* rhs,
+                                                uint32_t lLength,
+                                                uint32_t rLength ) const
+  {
+    if (lLength != rLength)
+      return (lLength > rLength) ? 1 : -1;
+    int32_t result=int32_t(PL_strncasecmp(lhs, rhs, lLength));
+    //Egads. PL_strncasecmp is returning *very* negative numbers.
+    //Some folks expect -1,0,1, so let's temper its enthusiasm.
+    if (result<0) 
+      result=-1;
+    return result;
+  }