Any annoying, condescending prick who goes out of his way to make it known that he uses Firefox for all of his web browsing needs.
Fark poster #1: OMG, that link had a very annoying pop-up ad.
Fark poster #2: LOL, n00b. I haven't seen a pop-up ad in over two years, thanks to Firefox.
Fark poster #1: STFU, Firefag.