Comment 4 for bug 1992291

Finally, success in locating the previous version (why is this so difficult?).

For anyone else who's been hit by this breakage, here's where to find a working version of Thunderbird:

https://launchpad.net/~ubuntu-mozilla-security/+archive/ubuntu/ppa/+build/24124419

After reverting back to this level everything "just works" again. I'll have to figure out how to lock out updates.