This is pretty good, but you can definitely make it better! For instance, when you go fullscreen, the button disappears. It would be super helpful and we could use Android's own virtual back button to exit fullscreen, it would be even better if we could move that virtual button around. Also, I'd love to choose the button's icon. The current one is fine, but it'd be great to have other options in case somebody get tired of it later on.

only one that works for me. I use for io games using samsung dex!

It works! The only thing I would also like to have is to be able to change the position of the toogle button. Thank you!

Solid work, I appreciate the necessary addition to Firefox, I just have one request. Can we please have the option to make the pull tab dissappear after a few seconds, it's so prominent, especially with the chosen colour scheme, kinda defeats the purpose of 'fullscreen'. Please and thank you.