If you do, get the Ffvb addon. It allows you to manage threads. You can highlight them, and you can ignore them, just as you can do with individual posters.
It also has a more complete "ignore" function. It will not only ignore a poster, it will wipe him off your computer (no "user on ignore..." statement). It goes further than that, in that it also ignores that poster if someone else is quoting him/her. Even better, you can do all that without having to go to the site's settings.
You can read up on it here:
https://addons.mozilla.org/en-US/firefox/addon/7023/