Greasy Fork镜像 is available in English.
Helps removing garbage from your recommended videos, adds a scrollbar for videos while watching
You can hide unwanted videos/spoilers from your recommended. after installing the script you will see the menu appearing on the top bar: 
Write the keywords you want to block and the video will not appear in your recommended.
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Add a scrollbar to the list of videos on youtube's player page so it doesn't scroll the whole page but only the videos so you can keep watching and scroll throught the list at the same time.
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Allows to change the background to a custom colour. You can use every function the background property has including url(background.jpg).
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Remove the cinematics behind the video when it's playing
