diff -r 000000000000 -r 6474c204b198 dom/interfaces/settings/nsIDOMMozSettingsEvent.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/settings/nsIDOMMozSettingsEvent.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* 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 "nsIDOMEvent.idl"
+interface nsIVariant;
+
+[scriptable, builtinclass, uuid(d5081bf4-6a63-4ee6-8ce6-f488082dc08f)]
+interface nsIDOMMozSettingsEvent : nsIDOMEvent
+{
+  readonly attribute DOMString  settingName;
+  readonly attribute nsIVariant settingValue;
+
+  [noscript] void initMozSettingsEvent(in DOMString aType,
+                                       in boolean aCanBubble,
+                                       in boolean aCancelable,
+                                       in DOMString aSettingName,
+                                       in nsIVariant aSettingValue);
+};