Hover a thumbnail on youtube.com and click an icon at the right: "Not interested" and "Don't recommend channel"
< 脚本 YT: not interested in one click 的反馈
Never mind, just went back to youtube and it's working the same. No idea what the hell was going on, but it's good now.
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This is one of two scripts that make youtube usable for me. Unfortunately it stopped working over night. I'm running Firefox 92.0a1 (2021-08-04) (64-bit). Icons just don't show up.
I marked it "bad" but this is a fantastic addition that I had been using for months and months.