amend! TB 41435: Add a Tor Browser migration function

    Services.prefs.setIntPref(MIGRATION_PREF, MIGRATION_VERSION);

  },

  async upgradeTB(isNewProfile) {

  /**

   * Run the profile data migration for Tor Browser if needed.

   *

   * @param {boolean} isNewProfile When true, just set the migration version

   * without actually changing anything.

   * @param {number} [currentVersion] The version to migrating from. To be used

   * only by tests.

   */

  async upgradeTB(isNewProfile, currentVersion) {

    // Version 1: Tor Browser 12.0. We use it to remove langpacks, after the

    //            migration to packaged locales.

    // Version 2: Tor Browser 13.0/13.0a1: tor-browser#41845. Also, removed some

      console.error("upgradeTB: isNewProfile is undefined.");

    }

    const currentVersion = Services.prefs.getIntPref(MIGRATION_PREF, 0);

    if (currentVersion === undefined) {

      currentVersion = Services.prefs.getIntPref(MIGRATION_PREF, 0);

    }

    const removeLangpacks = async () => {

      for (const addon of await AddonManager.getAddonsByTypes(["locale"])) {

        await addon.uninstall();