Logins and Passwords
My logins and passwords keep getting removed. I have to go and place a copy of the key4, logins, and logins.json back into the folder. Every few days the logins and passwords shows no synced logins found.
That is weird.
Do you only lose logins/passwords and do you keep other data ?
Did you make sure you still use the same profile ?
If you use external cleanup software (CCleaner) then check the settings for Firefox.