The Firefox browser I was using failed to back up the synchronization data of the domestic version due to negligence in reinstalling the new version. Starting from May 24th, after logging into the domestic version account, data synchronization cannot be achieved. (Currently, all downloads automatically redirect to the international version, and the login account is also the international version account. However, the domestic version data was not backed up before, and it is necessary to log in to the domestic version again to back up the data.) . Is there any expert who can offer a solution? The data of eight years has not been backed up. Urgent