I do have my own system on following/starring PoI in HN, using no extension at all, so I can instantly know who's comment is more useful
no banning though, since valuable nuggets on knowledge can come from anyone
whomever you want to take interest to, will pops up in 'Visited Link' color, the rest just normal URL
obviously works best in less-hyperlink sites like HN, wikipedia quite tolerable
YMMV :D
I do have my own system on following/starring PoI in HN, using no extension at all, so I can instantly know who's comment is more useful
no banning though, since valuable nuggets on knowledge can come from anyone