1. (Uppercase) Mozilla Firefox, the browser of choice among furfags. Firefag has many fanboys, much like the Playstation 3, which is another over-hyped piece of shit only furfags and Canadians would like.

2. (Lowercase) Someone who uses Firefag, insisting that "it's better than IE because it has tabbed browsing" even though IE has had tabs since the introduction of IE 7, but firefags will insist "oh, they stole that from Firefox," even though Firefag stole it from Opera, which likely got the idea from AOL.
Firefags are typically smug, elitest, anime-fan type basementdwellers, just like most Mac users, and like to try to force other people use Firefag, much like how Macfags like to force people to use Macs (Professors at art college, for example). Sometimes, they will even go so far as to make their websites only work when viewed on Firefag, but that begs the question: If Firefox is so great, people would choose to use it of their own volition, so why do you have to force others to use it?

3. (Lowercase) A retard.

Like normal furries (or, more accurately, normal furries who dress in fursuits for sexual purposes, since most furries are just people who like art featuring anthropomorphic animals), babyfurs get sexual gratification from wearing a fursuit. Unlike normal furries, they also get sexual gratification from wearing diapers, watching Teletubbies, et cetera.

A fine website devoted to demonstrating things considered as deviations from normality. You can expect seeing fecal porn there, guys in fursuits being humped by stuffed horses, and the like. A fine site indeed.

a group of people that are into anthro art(art based on humanoid animals). a smaller group of wich go to cons and dress up in their fursuits (suits made to look like their fursonas). contrary to how media portrays them not all of them are into yiff, and pretty much all of them are not 40yr-old virgin as shown in one episode of CSI, as mos of the range from 15/16 to 25. they are also pretty pleasant to be around unlike what youd see on the news. those guys deserve to be troll'd. you also wouldnt know they were furries unless they told you they were,theyre normal people, they could even be your best friend and you wouldnt know because of the flak they get.

(Also called "FA" for short) The largest and most popular anthropomorphic art website on the net. Many anthro artists are "furries," who take active roles in the community making art, wearing fursuits and/ or going to conventions. This is called furry fandom

A sort of euphemism for the term "furry." A furry is a member of the furry fandom, that is, someone who enjoys and/or connects with anthropomorphic animals and likes anthro art, fiction, etc. (Some furries dress in fursuits, which are like mascot costumes.)

Some members of the fandom prefer the term "fuzzies" because of bad press painting furries as sexual deviants. (Though there is a small though verbal minority in the fandom who are fetishists and/or sex deviants, the vast, vast majority are like members of any other fandom, such as Star Wars fans, Trekkies, and RPGers.) "Fuzzies" don't want to be associated with the bad press, and is sometimes used by professional costume performers in place of the term, "furry."

A sort of euphemism for the term "furry." A furry is a member of the furry fandom, that is, someone who enjoys and/or connects with anthropomorphic animals and likes anthro art, fiction, etc. (Some furries dress in fursuits, which are like mascot costumes.)

Some members of the fandom prefer the term "fuzzies" because of bad press painting furries as sexual deviants. (Though there is a small though verbal minority in the fandom who are fetishists and/or sex deviants, the vast, vast majority are like members of any other fandom, such as Star Wars fans, Trekkies, and RPGers.) "Fuzzies" don't want to be associated with the bad press, and is sometimes used by professional costume performers in place of the term, "furry."