Only had the issue on my T400, but it was an issue under FreeBSD 13.4 /w the FireFox/FireFox ESR available from pkg… and the same darn thing is happening with Debian Bookworm. I’m wondering if the ancient Core 2 Duo is playing a role here… (tries to do X unsupported thing… & crash. ?)
Mostly when doing a search on google… and you click a link and BAM, back to the tty. (or login greeter screen)
Not the browser crashing either, when this happens it kills the whole X server. So not cool! Luckily I didn’t loose any work when this happened, and it has happened about half a dozen times or more. Saving frequently saves the day. I thought I was getting somewhere when I saw a post about trying to disable the HW acceleration option in FF preferences, and I did try. Unfortunately though, no luck.
Something did seem to work though, using the latest FF package from Mozilla. Here is an excellent, easy to follow cut & paste to get you the latest Firefox on Debian: https://support.mozilla.org/en-US/kb/install-firefox-linux
That got me to v 134, and the problem appears to be gone.
UPDATE: THE PROBLEM STILL HAPPENS on v 134 Sorry.