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.
** Changed in: firefox (Ubuntu)
Status: New => Confirmed
** Changed in: firefox (Ubuntu)
Importance: Undecided => Medium
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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Firefox
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