diff -r 000000000000 -r 6474c204b198 dom/interfaces/events/nsIDOMPopStateEvent.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/events/nsIDOMPopStateEvent.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */
+
+#include "nsIDOMEvent.idl"
+
+interface nsIVariant;
+
+[scriptable, builtinclass, uuid(f0def4a3-0eb3-4c08-b476-582e37b8564b)]
+interface nsIDOMPopStateEvent : nsIDOMEvent
+{
+  /**
+   * The state associated with this popstate event
+   */
+  readonly attribute nsIVariant state;
+
+  void initPopStateEvent(in DOMString typeArg,
+                         in boolean canBubbleArg,
+                         in boolean cancelableArg,
+                         in nsIVariant stateArg);
+};