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/usr/share/idl/thunderbird/nsISystemMessageCache.idl is in thunderbird-dev 1:38.6.0+build1-0ubuntu1.

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/* 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 "nsISupports.idl"

[scriptable, uuid(e888447c-6d4d-4045-92bd-1a5985404375)]
interface nsISystemMessageCache : nsISupports
{
  boolean hasPendingMessage(in DOMString type,
                            in DOMString pageURL,
                            in DOMString manifestURL);
};