Comment 2 for bug 1835682

Thank you for the report karah. Had this bug been reported before? If so, then there was no need to file a new bug, otherwise I'm not sure how you'd expect an unreported bug to be fixed.

Anyway, I'm able to observe the issue as you describe it in a 19.04 VM. Keeping the F11 key down seems to grind the shell to a halt, but I don't see it crash. Instead, it appears frozen, but if I release the F11 key and wait for a while, the system becomes usable again. Without further investigation, I guess what happens is that firefox queues a large number of (fullscreen on; fullscreen off) events while the F11 key is down, and the window manager needs some time to cope with these requests.

It's probably a firefox bug, but I'm adding a mutter task too, because presumably the window manager should be more resilient to faulty behaviours like that.