gecko/browser/base/content/sync/customize.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/. */

"use strict";

addEventListener("dialogaccept", function () {
  let pane = document.getElementById("sync-customize-pane");
  pane.writePreferences(true);
  window.arguments[0].accepted = true;
});