Add Fullscreen mode

[asdf3]

I use Firefox on a small tablet in landscape mode I have set it to hide the toolbar - screen real estate is always precious, but crucial on smaller devices.
As soon as i want to scroll down on the website the tool and addressbars reappear and take about 20% of my screen, which i really don't need at that point in time. I dont want to change Tab, I just want to scroll on the page.
There is this extremly handy plugin, which adds the functionality that i need:
https://github.com/Justnotthisway/firefox-pulltab-fullscreen

However this then leads to the problem, that i can't pinch zoom anymore, because apparently that's dissabled from FF side, when in immersive mode.
https://github.com/Justnotthisway/firefox-pulltab-fullscreen/issues/1

So basically i am asking for two seperate features:
- A fullscreen mode button (though that is already solved via plugin)
- and the ability to pinch zoom even in immersive mode

More and more people work on mobile and tablets, so we'll take any pixel we can get as screen space.
Thank you

[Jon]

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