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/usr/lib/thunderbird-addons/extensions/{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}/modules/shim/Timer.jsm is in xul-ext-gdata-provider 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/. */

var EXPORTED_SYMBOLS = ["setTimeout"];

function setTimeout(func, timeout) {
    let timer = Components.classes["@mozilla.org/timer;1"]
                          .createInstance(Components.interfaces.nsITimer);

    timer.initWithCallback({ notify: func }, timeout, timer.TYPE_ONE_SHOT);
    // Timer.jsm usually keeps track of the timers to be able to cancel them,
    // but we only use it for postponing things so this is enough.
}