Firefox fullscreen breaks Windows Alt+Tab functionality

I've noticed a very annoying issue with Firefox full screen mode that's been around longer than I've been using it.

I use full screen mode all the time and never switch back to windowed mode. But I notice that often when I try to Alt+Tab to a different window, OS windows selection appears for a brief second, then disappears and Firefox retakes focus. Sometimes you can get it to work if you're quick and you only want to change to the previous window, but if you want to change to another window you won't have time. The only way to reliably Alt+Tab out of Firefox when its in full screen mode is to press the Win key first (giving focus to the Start Menu) then Alt+Tab.

Its not a deal breaker for Firefox or full screen mode, but its a very annoying issue and it would be really great to see it fixed.

Steps to recreate (doesn't fail every time):

1. Open several windows (Windows Explorer, photo editor, etc)

2. Open firefox and switch to full screen mode.

3. Hold down Alt and keep pressing Tab in an attempt to reach one of the other windows

Result: The OS Alt+Tab display appears for a split second, then disappears again and Firefox takes focus.

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