Bugzilla

(In reply to mbstein from comment #6)
> Set gfx.webrender.software to true 

Yes, only this one relevant.

> Can't say straight away if it helps though - it really varies. Sometimes it happens 2-3 times in an hour, sometimes I don't have a problem for days. I rarely use suspend, and that's only when I am on the Windows partition (which autosuspends) - but I've got no strange freezes and crashes there.
> Also, 1717347 doesn't apply to me - got an Ryzen 5 3600.

On Mesa drivers, the graphics card is most likely not the source of a bug. It's more likely some integration problem (vsync, Gtk widget, compositing vs. non-compositing window manager).
Or could it be caused by the video element's picture-in-picture mode? Once it froze my entire Xwayland desktop when I closed the PiP window (but I'm using EGL and experimental VAAPI hardware video decoding).
Do you use multiple Firefox windows? Does it still occur if you only use one the whole session?

If we find steps to reproduce, we can easily find out which patch introduced the bug.

(In reply to mbstein from comment #6)
> Set gfx.webrender.software to true 

Yes, only this one is relevant.

> Can't say straight away if it helps though - it really varies. Sometimes it happens 2-3 times in an hour, sometimes I don't have a problem for days. I rarely use suspend, and that's only when I am on the Windows partition (which autosuspends) - but I've got no strange freezes and crashes there.
> Also, 1717347 doesn't apply to me - got an Ryzen 5 3600.

On Mesa drivers, the graphics card is most likely not the source of a bug. It's more likely some integration problem (vsync, Gtk widget, compositing vs. non-compositing window manager).
Or could it be caused by the video element's picture-in-picture mode? Once it froze my entire Xwayland desktop when I closed the PiP window (but I'm using EGL and experimental VAAPI hardware video decoding).
Do you use multiple Firefox windows? Does it still occur if you only use one the whole session?

If we find steps to reproduce, we can easily find out which patch introduced the bug.