Mozilla Connect

Oh, and you apparently need to launch the application with -allow-downgrade if your Thunderbird already updated

I got a previous version from the archivehttps://archive.mozilla.org/pub/thunderbird/releases/102.15.1/

Agreed. I just installed the previous version and disabled updates. Minor UI redesigns are fine, but major changes like this - especially things like rearranging the windows standard of the 'file-edit-view' bar thingie (forget the name) being above e...