Full Screen Doesn't Work.. Please Help

[killz]

I got FF 56.0. I can no longer go full screen on FF. How do I fix this??

[DanRaisch]

It certainly works here in version 56.

Have you tried starting Firefox in Mozilla Safe Mode? http://kb.mozillazine.org/Safe_mode
If no improvement using Safe Mode, do you have the same problem if you create a new profile and test it with no extensions or non-default themes installed?
http://kb.mozillazine.org/Profile_Manager
and
http://kb.mozillazine.org/Creating_a_ne ... on_Windows

[therube]

> I can no longer go full screen on FF

Browser itself, as in F11, or videos within the browser?
I have come across some that the "fullscreen" (video) browser button is ineffectual.
(Possible that is due to an extension of mine?)