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.
Try reverting to the old youtube layout and then changing back to the new. I somehow managed to fix it by doing that. If you are unsure on how to revert back follow this here:https://www.reddit.com/r/youtube/comments/82wjto/youtube_removes_the_way_to_restore_the_old/ …
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