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diff --git a/tools/addon-sdk-1.4/packages/api-utils/lib/preferences-service.js b/tools/addon-sdk-1.4/packages/api-utils/lib/preferences-service.js
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+++ b/tools/addon-sdk-1.4/packages/api-utils/lib/preferences-service.js
@@ -0,0 +1,138 @@
+/* ***** 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 Preferences.
+ *
+ * The Initial Developer of the Original Code is Mozilla.
+ * Portions created by the Initial Developer are Copyright (C) 2008
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Myk Melez <myk@mozilla.org>
+ *   Daniel Aquino <mr.danielaquino@gmail.com>
+ *   Atul Varma <atul@mozilla.com>
+ *   Erik Vold <erikvvold@gmail.com>
+ *
+ * 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 ***** */
+
+"use strict";
+
+// The minimum and maximum integers that can be set as preferences.
+// The range of valid values is narrower than the range of valid JS values
+// because the native preferences code treats integers as NSPR PRInt32s,
+// which are 32-bit signed integers on all platforms.
+const MAX_INT = 0x7FFFFFFF;
+const MIN_INT = -0x80000000;
+
+const {Cc,Ci,Cr} = require("chrome");
+
+var prefSvc = Cc["@mozilla.org/preferences-service;1"].
+              getService(Ci.nsIPrefService).getBranch(null);
+
+var get = exports.get = function get(name, defaultValue) {
+  switch (prefSvc.getPrefType(name)) {
+  case Ci.nsIPrefBranch.PREF_STRING:
+    return prefSvc.getComplexValue(name, Ci.nsISupportsString).data;
+
+  case Ci.nsIPrefBranch.PREF_INT:
+    return prefSvc.getIntPref(name);
+
+  case Ci.nsIPrefBranch.PREF_BOOL:
+    return prefSvc.getBoolPref(name);
+
+  case Ci.nsIPrefBranch.PREF_INVALID:
+    return defaultValue;
+
+  default:
+    // This should never happen.
+    throw new Error("Error getting pref " + name +
+                    "; its value's type is " +
+                    prefSvc.getPrefType(name) +
+                    ", which I don't know " +
+                    "how to handle.");
+  }
+};
+
+var set = exports.set = function set(name, value) {
+  var prefType;
+  if (typeof value != "undefined" && value != null)
+    prefType = value.constructor.name;
+
+  switch (prefType) {
+  case "String":
+    {
+      var string = Cc["@mozilla.org/supports-string;1"].
+                   createInstance(Ci.nsISupportsString);
+      string.data = value;
+      prefSvc.setComplexValue(name, Ci.nsISupportsString, string);
+    }
+    break;
+
+  case "Number":
+    // We throw if the number is outside the range or not an integer, since
+    // the result will not be what the consumer wanted to store.
+    if (value > MAX_INT || value < MIN_INT)
+      throw new Error("you cannot set the " + name +
+                      " pref to the number " + value +
+                      ", as number pref values must be in the signed " +
+                      "32-bit integer range -(2^31) to 2^31-1.  " +
+                      "To store numbers outside that range, store " +
+                      "them as strings.");
+    if (value % 1 != 0)
+      throw new Error("cannot store non-integer number: " + value);
+    prefSvc.setIntPref(name, value);
+    break;
+
+  case "Boolean":
+    prefSvc.setBoolPref(name, value);
+    break;
+
+  default:
+    throw new Error("can't set pref " + name + " to value '" + value +
+                    "'; it isn't a string, integer, or boolean");
+  }
+};
+
+var has = exports.has = function has(name) {
+  return (prefSvc.getPrefType(name) != Ci.nsIPrefBranch.PREF_INVALID);
+};
+
+var isSet = exports.isSet = function isSet(name) {
+  return (has(name) && prefSvc.prefHasUserValue(name));
+};
+
+var reset = exports.reset = function reset(name) {
+  try {
+    prefSvc.clearUserPref(name);
+  } catch (e if e.result == Cr.NS_ERROR_UNEXPECTED) {
+    // The pref service throws NS_ERROR_UNEXPECTED when the caller tries
+    // to reset a pref that doesn't exist or is already set to its default
+    // value.  This interface fails silently in those cases, so callers
+    // can unconditionally reset a pref without having to check if it needs
+    // resetting first or trap exceptions after the fact.  It passes through
+    // other exceptions, however, so callers know about them, since we don't
+    // know what other exceptions might be thrown and what they might mean.
+  }
+};