Full screen mode on Tor?

Are there open source applications which spoof full screen size?
The tool which add some black edges to the screen and when you would full screen Tor so it would not have your true screen size.

Trace, but its not recommended to install more addons in Tor so yeah

I thought rather about some external program, not one within browser.

The only things I can think of are virtual machines (which would fullscreened reveal your display size) and Wine (where if I recall correctly it has an option to have individual window that contains all your Wine apps, but I wouldn’t recommend it).

The Tor Browser feature to hide your screen size would be called as letterboxing and it could also be enabled in Firefox by going into about:config and creating a new boolean privacy.resistFingerprinting.letterboxing as True. It’s also part of my usual Firefox setup.

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