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/usr/share/idl/thunderbird/nsIPrivacyTransitionObserver.idl is in thunderbird-dev 1:52.8.0-1~deb8u1.

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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, function, uuid(b4b1449d-0ef0-47f5-b62e-adc57fd49702)]
interface nsIPrivacyTransitionObserver : nsISupports
{
  void privateModeChanged(in bool enabled);
};