This bug contains many different things, I filed and linked other bugs for them (see comment #10 and comment #11). I think the main issue of this bug is that the form validation popup could block pressing ESC key to exit fullscreen. User can still press ESC rapidly many times to make it work, or use some other way to exit fullscreen, e.g. Alt/command + <number> to switch to another tab etc. But anyhow, form validation popup should not block ESC key to exit fullscreen. I am going to try to fix this here.
Bug 1883396 Comment 12 Edit History
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This bug contains many different things, I filed and linked other bugs for them (see comment #10 and comment #11). I think the major issue of this bug is that the form validation popup could block pressing ESC key to exit fullscreen. User can still press ESC rapidly many times to make it work, or use some other way to exit fullscreen, e.g. Alt/command + <number> to switch to another tab etc. But anyhow, form validation popup should not block ESC key to exit fullscreen. I am going to try to fix this here.