Not sure what is going on, but my Thunderbird (Swedish version) was automatically updated yesterday (12/29/19) to 68.3.1and now my email doesn’t work. When I open it, no messages (or the accounts) show up on the screen. I go to get messages for one of my accounts and the request just disappears. I go to “About Thunderbird” in the Help section and I get the swirling wait circle with “Applying update…” next to it. I let that run for 24 hours and nothing happened. I’m posting this here in case somebody else is having the same problem.