Greasy Fork is available in English.
Adds features to YouTube player page: fill window with video, stretch, float video, set HD 4K 8K resolution, hide annotations and ads, click skip ads, click show more, loop, replay a video segment, pause at start/end, zoom and pan video.
Background of the pop-up settings window.
Can you make the style of the settings window in Material Design?
I would like to help, but I do not know JS!
My example (in Photoshop):