The only problem is that removing blocked authors is broken, requiring you uninstall the extension and re-enter all your other blocks, and that general modification is though a somewhat clunky interface. A simple text file as an alternative way would make life much easier.

Does what it says on the tin. As AO3 annoyingly does not let you set a blacklist so this add-on is essential (alongside "AO3 Enhancements") to not have finding new fics be a chore.

had some trouble getting this to work at first, but I was able to overcome the issues and am happy to report that it runs smoothly. now I dont have to Witness Horrors and be horribly triggered every time I go into a tag! Thank you!

Thank you for letting me permanently block that one annoying million words and two million tags fic from ever appearing in my search results again. Works like a charm.

Great for avoiding triggering material (csa/noncon/ect.). The interface takes some getting used to but is pretty easy once you get a hang of it.
Only problems I've encountered come with removing usernames from the list of blocked things. Would be great if an option for that came because I accidentally put in two usernames at once and effectively broke the app lol.