Definition A. (proper noun): An overrated Web browser made by Mozilla, often used for either:
1) The vast amount of largely-useless add-ons it has;
2) Viewing pornography on the Internet;
3) Its obvious superiority to Internet Explorer (AKA IE);
4) Its obvious superiority to all other browsers; or
5) Its obvious superiority to life, the Universe; and everything else, including the kitchen sink and a unicorn's horn count.

Definition B. (noun): A synonymous term for red panda, which is an indigenous animal to Southeast Asia.

Definition C. (verb): A rapidly-spoken order from either an organization's boss or some other high-ranking officer, most often used to kick another employee out of their job. Usually, that said employee has either:
1) The given name "Fox;"
2) The surname "Fox;" or
3) The nickname "Fox."
Example of Definition A:
Person 1: "Dammit, Internet Explorer just crashed on me again!"
Person 2: "Well, why don't you just use Firefox, then? It'll save you a lot of trouble."
Person 1: "Um, what did you say?"
Person 2: <inefficiently tries to explain what a Web browser is, and what Firefox is, and what its benefits over IE are, and so on, until Person 1 is finally convinced.>
(Later that week...)
Person 1: <goes on long rant about how awesome Firefox is.>
Person 2: "I know, right?!" (Etcetera, etcetera.)

Example of Definition B:
Some random person: "Red pandas are cute. No exceptions."

Example of Definition C:
Some CEO's Wife: "FORTHELOVEOFGOD-FIREFOX!!!!!"
Some CEO: "Okay, fine, whatever- I'll do it!"
by foxhead120 October 02, 2010
Simply the best browser out there. It will make you wonder why you ever used IE.
Why are you still using that outdated piece of crap IE when you can use Firefox?
by Frogbutt November 30, 2004
An awesome web browser from Mozilla. It was originally derived from Mozilla's (Seamonkey) code, but now has plenty of coding of its own. It supports W3C's standards and is quite secure. Best of all, it doesn't have support for Microsoft's security hole (read: gate for hackers to enter your computer) known as ActiveX, nor does it have most of the problems Internet Explorer has.
Mozilla will pay anyone $500 bucks for volunteering to fix security holes in its software, which is free (yes, as in speech, but also as in beer). That's pretty generous.
by Intelligence: The Anti-N00b February 26, 2005
The most kickass web browser out there now (developed by Mozilla). It is so superior in comparison to Microsoft's Internet Explorer. Try it! You'll wonder how you ever surfed the net without it.

You won't be disappointed.
Support open source. Support Mozilla.
by RC March 03, 2005
Incredibly good browser overflowing with useful features from the good folks at Mozilla. Tabbed browsing, a near-impenetrable popup blocker and general awesomeness compounded by the fact that you can add just about any feature you want using Firefox's plugin support make for a browser that simply trounces anything else.

The only flaw is the name. They ought to call it Firebox because that'd be seriously awesome.
I can't believe how utterly awesome Firefox is. And yet, if only it were named Firebox, it might be ten times awesomer.
by Spazmo May 30, 2004
The internet condom.
Going on the internet without firefox is like walking into an Al-Qaeda camp with nothing but american flag designed underpants.
by Kazzz May 16, 2007
Something noobs will never understand
"lofl firefox? i think i will use intarweb explorar!!!1!1"
by peen March 19, 2005
An awesome browser that has features that IE neglected. Popup blocking, tabbed browsing, keyword searching... extentions let you do mouse gestures and a lot more.

Oh, did I mention, it's faster too. And it's only 14 MB.
People come to me with their computer problems, saying that IE stopped working. I send them the Firefox as a solution, and later, they always thank me for it.
by DrIdiot June 27, 2004

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