A short tip on how to revert Full Screen of FireFox to the original setting.
If you accidentally or out of curiosity you go and click on "Full Screen" of Firefox, and you don't know how to reverse it to the original setting, don't panic.
This is what you need to do.
Just press on F11 key from your keyboard. It will automatically goes back to the original screen.
This is how you exit Full Screen setting of Firefox.
