Greasy Fork is available in English.
Hover a thumbnail on youtube.com and click an icon at the right: "Not interested" and "Don't recommend channel"
< YT: not interested in one clickについてのフィードバック
Should be fixed now.
Thank you
unsurprisingly, still doesn't work.
Doesn't work with latest update. (Win64 10.0; Firefox 102.12.0esr)