Greasy Fork is available in English.
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It's working fine now. Must have been YouTube testing something that broke the script.
I guess it could be due to the ad issue. Install this script to by pass the video ads in using "Audio Only"
P.S. The normal adblocker might not work with "Audio Only"
It breaks the playlists now. When a video finishes, it does not go to the next one. If I disable the script, this does not happen.