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.
Old Layout (annoyingleft sidebar)
Utube put useless left sidebar for all users even without login. please add restore old layout feature like: Restore Old Youtube