choose what to sync menu. If they aren't equal
      // and the checkbox is checked, we add the engine to the enabled list; if
      // the checkbox isn't checked we add the engine to the disabled list. If
      // the pref and the checkbox value are equal we do nothing as nothing was
      // changed.
      if (Services.prefs.getBoolPref(enabledPref, false) !== checkboxValue) {
        if (checkboxValue === true) {
          settings.enabledEngines.push(engine);
        } else if (checkboxValue === false) {
          settings.disabledEngines.push(engine);
        }
      }
    }
    return settings;
  },
};

window.addEventListener("load", () => gSyncChooseWhatToSync.init());
PK