Hey @YouTube! For some reason i cannot go in fullscreen mode while viewing a video. Weirdly enough when i logout and login via a different account i can go fullscreen, but then again when i logged back into my own account fullscreen doesn't work. I'm using Firefox Quantum on PC.
Nothing, I tried clearing the cookies/cache aswell. This only happens when I'm logged into YouTube via my primary account as I can go full screen when using a different google account on the same browser.