While I do not know about Mac OS compatibility, I believe that this one is browser dependent.
I found versions for Chrome and Firefox, showing the author’s preferences at the time it was written.
Not sure about Safari or other non-Chromium browsers, or about the entire Windows/Mac/M1 world.
Pinging some folks who should be able to shed light on the subject.
Your input is needed. 😀
However back in 200? I wrote a greasemonkey script to add an "Ignore" button on the "Post Reply" line. It would then remove every post by that poster in every thread.
I have since changed computers a couple of times and I don't think I have it any more, but it was cool. Looked like it belonged there.