it is said here that synced data is encrypted to save privacy and protect against identity theft . https://support.mozilla.org/en-US/kb/firefox-lockwise-and-privacy but if the synced data is encrypted by device A and sent to mozilla server for saving, how does device B able to decrypted the data received from mozilla after signing in ? this can be possible only if the encryption happens at mozilla server side and not the device itself . doesn't this means mozilla server as well able to decrypt the data and read it ? so you can read all my passwords i synced through you ?