I have 4 computers with Ubuntu 18.04 and in all 4, Thunderbird stopped saving credentials. Every time I open Thunderbird I have to enter passwords and/or OAuth2 authentication information and even when I do that, the Google account does not work. What can it be? Why is Thunderbird not saving this information in all 4 computers at the same time? I checked folder permissions but everything seems to be OK. The problems started yesterday and I haven't installed any Thunderbird updates.
For other accounts, it just asks for the password every time and apparently works fine until I close and open Thunderbird again.