Greasy Fork is available in English.
Moves the YouTube video to the top of the website and fill the window with the video player.
< Feedback on Resize YT To Window Size
Issue tracked at: https://github.com/Zren/ResizeYoutubePlayerToWindowSize/issues/70
v130 should fix this. Sorry for not responding earlier, greasyfork.org email notifications were sent to spam.
It would be nice if the script would not cut off any of the video, but other than that, it is great.