I am running Firefox 122.0 on Ubuntu 22.04. When I have a decent number of tabs open, firefox will often randomly decide to lock up completely. GUI is almost entirely unresponsive. I can right click the menu bar area and get the Menu Bar/Bookmark Options/etc. context menu, but it's also screwed up (2 options that are normally there are completely missing). This has occurred for a year or so. Originally, I used the snap version but recently backed up and switched to installing from .deb. Still the same issue. I saw recommendations for turning off hardware acceleration, and that didn't prevent the problem. Running `top`, I see that I always have plenty of memory (at least 10G free) free and worst case 1 thread is being run 100% but the others are hardly being utilized. No crash reports are generated (I will pkill firefox to stop it). Addons and extensions are all disabled.

I recently realized that hitting the windows key with firefox frozen will allow the web page to show again, but it's back to frozen. I keep hitting the windows key, and it will unfreeze just momentarily to show me the current webpage that is up. I can also Ctrl+N and open a new window, and the new window works perfectly fine independent of the completely frozen first window.