Greasy Fork is available in English.
Select a youtube resolution and resize the player.
There was an issue with the resizing being broken. I made an update today (very late, I know, sorry) to fix that resizing issue. If that was your problem, can you please see if the update fixes it for you? If you there isn't something else not working right, can you please let me know specifically what it is?
Currently does not work anymore.