Mozilla Thunderbird.

68.10.0 working fine here. 78.3.1 still segfaults. Its really great hearing from all who are not having a problem. Helps me tremendously. Right now, I'm camping and enjoying the good life. Just came home to drop off grandkids then we are alone for 10 days..... I'll figure this out when I get back.

It looks like getting rid of prefs.js will start thunderbird-78 with profile previously used by thunderbird-68, but that's not very useful since most of important settings will be gone.
Furthermore, it takes one setting on a clean profile to crash it, try this: Preferences -> General -> Language & Appearance -> click "Colors" button -> Enable "Use system colors" and click OK -> Instant crash
This change can be undone by erasing "browser.display.use_system_colors" from prefs.js, and it will start working again.
Additionally, setting "browser.display.foreground_color" crashes it as well, even to a default value, there are probably more...
Can anyone reproduce?

* update: Downloading and running thunderbird from the official release tarball fixes above mentioned issues with settings

Originally Posted by mario Furthermore, it takes one setting on a clean profile to crash it, try this: Preferences -> General -> Language & Appearance -> click "Colors" button -> Enable "Use system colors" and click OK -> Instant crash

I don't have this behaviour. Everything works fine here with Thunderbird 78.3.2 on Slackware64 current with KDE 5.
I didn't have any crash when I upgraded from 68 to 78 using slackpkg. My upgrade went smoothly, I didn't have to create a new clean profile. I kept my existing profile.
I have no add-on modules. I just added french dictionary and french language package.
Hope this helps.

Fwiw, I've caught up with -current, and I also observe Thunderbird seg faulting. I have no further insight at this point.

package: mozilla-thunderbird-78.3.2-x86_64-1

Originally Posted by mario [...] This change can be undone by erasing "browser.display.use_system_colors" from prefs.js, and it will start working again. [...] Can anyone reproduce? [...]

Confirmed. That solved the issue for me. Thanks!

I have been on a camping trip for the last two weeks and solved this problem of segfaulting this morning. I moved .thunderbird to thundebirdold. I then upgraded to 78.3.3. Started TBird and punched in settings for my email account. Then I went into .thunderbird and deleted xxxxdefault/Mail. I then copied from thunderbirdold/xxxxdefault/ the Mail folder. Problem solved.

I did not copy over any themes or extensions. I have all my mail folders plus all mail. I'll do addons when the mood strikes me. It seems I didn't use many extensions anyway that I can't live without.

Well - I noticed that I was still using pop3 instead of Imap. Now converting this was a trip. Creating a new existing account and copying over all stuff between folders. I couldn't just drag and drop a folder, I had to create that folder new in the imap account and copy the old stuff into the new folder. Not hard - just a time waster. Then removed the pop3 account....