hello, if you have reset your firefox account password, all sync data on the server is gone unfortunately, as your old password was the only key that was able to decrypt it...

In the event that the passwords information is lost, you should record all information in a separate text file somewhere else on your hard drive, or written down. You can easily copy and paste if you need to do so. If you are concerned about someone else looking at that file, you can compress it using a password.