あるツイートに「いいね」や「リツイート」をしたTwitterユーザー全員をブロックまたはミュートする機能を追加する
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It was updated today and works again
The userscript is working again thanks to @nwxz. You can update to the latest version and check if it's fixed for you.
Hasn't worked for at least two weeks now, and I can't find a working alternative anywhere... sigh.