First, if this is about Sync services, you were using Firefox incorrectly. Sync wasn't made to be used for what you described doing. Second, if you happened to change / reset your Firefox Account Password, you inadvertently cleared all your Sync data from the Sync server. IOW, there is nothing left to "restore" it's gone. Sorry, but a warning message did tell you that would happen, but too many users don't take time to read that message or don't comprehend what is is telling you. You're welcome.