Greasy Fork is available in English.
Toggle mini player when scrolling down in Youtube
< Feedback on Youtube Mini Player (Fork)
Using this script is basically pointless at this time. There are extensions that do it, including a picture in picture extension made by google themselves, and you can even press i
to multitask with a miniplayer showing what you were watching while you navigate youtube
I found a much better Mini Player
Let's be honest, I haven't touched this script ever since I attempted to refactor it and realized how much of a mess it is.
https://www.mrfdev.com/enhancer-for-youtube
^ This is a browser extension. It works really well and has a solid UI. Use that instead. I'm using it right now and it does literally everything I set out to do with this fork.