I have the same problem as identified in "Thunderbird freezes almost immediately on startup on Fedora 32" problem, however, it occurs only from time to time, but nothing to do with Fedora 32, whatever that is? It happens after I login from Hibernate status. I have to go to the taskbar to close Thunderbird as nothing else responds on the Thunderbird screen, and then restart it. Then every thing works fine for a while. I am not sure if this coincident with a pending update which I don't seem to get a notification of, but once restarted the update happens and everything works fine for a while, till the next occurrence.