AdBlock Plus seems to be a new name for the same (well, or a later version of the) AdBlock plugin I learned to love. If it is under new maintainership or just got a fine new Plus piggybacked for coming of age, which in this case means maturing even further, I don't know, and the home page didn't much enlighten me, either. But it's still outstanding. And with the addition of the Adblock Filterset.G Updater, you don't even have to do most of the work of clicking away ads that annoy you.
Using Mozilla is still the "spoiling yourself silly" experience. I like that in a browser.