Edit C:\Program Files\Mozilla Firefox\defaults\pref\channel-prefs.js
/* 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/. */ // // This pref is in its own file for complex reasons. See the comment in // browser/app/Makefile.in, bug 756325, and bug 1431342 for details. Do not add // other prefs to this file. pref("app.update.channel", "esr");
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