The Tor Browser / file revision

 /* 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/. */

 dictionary MozInterAppMessageEventInit : EventInit {

   any data = null;

 };

 [HeaderFile="mozilla/dom/InterAppComm.h",

  Func="mozilla::dom::InterAppComm::EnabledForScope",

  Constructor(DOMString type,

              optional MozInterAppMessageEventInit eventInitDict)]

 interface MozInterAppMessageEvent : Event {

   readonly attribute any data;

 };