Firefox fullscreen fix ?

[MasterDragoOn[QC]]

Hello i try to fix the Firefox fullscreen in game mode.

I have find this : setting full-screen-api.ignore-widgets to true in about:config, allow you to fullscreen the browser from the upper right menu, at least. You can also use --fullscreen in the launch options if you're launching a PWA directly from the game UI.

But i dont know where about config are ...

full-screen-api.ignore-widgets is one launch option ?