Every time I login to my desktop it tries to restore Firefox and in turn Firefox tries to restore it's session, however all I get is a mess of graphical glitches, the interface doesn't even load, I get a window border and usually a copy of the KDE splash screen. I then have to kill the process, which of course means it looses my session so when I re-open it I get nothing, all my open tabs are gone and there is no restore session option. Further, it can't even play streaming videos properly anymore. After one or two episodes of a TV show its lagging sometimes by minutes, eaten gigs of ram and the video often gets stuck, the audio helpfully carries on with a frame of video from about 5 minutes ago. This is not an exaggeration, I had a YouTube video where it changed to a graph with a voice over, after 5 minutes I started to notice the voice over was talking about things not on that graph and sure enough the video had frozen. Its an i9 10850K with 32GB of RAM. The previous version of Firefox didn't mind restoring a session with over 350 tabs and plenty were videos, this one can't handle 2 when one is a video without freezing or locking up the whole browser. No other apps/ programs on this PC are having any issues, it is only happening in Firefox, I can for example open a media player and play a video just fine while the video is stuck in the browser or it has the graphic glitches. I also tried opening another instance of Firefox while it had the graphical issue, the new instance started and created a new entry on the task bar, but switching to it gave the same display as the broken one, I can't tell you what tabs either had open as nothing inside the window was rendered at all, not even the menu bar which I set to always being visible.