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.

Amazing, I am using it with the AO3 Enhancements Options (Because AO3 EO doesn't work for fandoms and characters when you want to block them as well)

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.