You probably know what Firefox extensions are and how they work. Here's the quick-and-dirty definition, from the Fox's mouth:

Extensions are small add-ons that add new functionality to Firefox. They can add anything from a toolbar button to a completely new feature. They allow the application to be customized to fit the personal needs of each user if they need additional features, while keeping Firefox small to download.

		Firefox: Essential Extensions
		•  Introduction •  No More Ads •  Flash Control Plus Three Tiny    Gotta-Haves •  Better Tabs, Downloads, And IE •  Speed And Secrecy •  Bonus: Search Plug-Ins •  Quick-Click Chart •  Image Gallery

The last time I checked, more than 970 extensions were available for download through addons.mozilla.org: Mozilla's official online source for All Things Firefox, also known as "AMO" to frequent visitors and lazy writers.

Click around AMO for a few minutes, and you'll get an idea of just how much creativity and hard work Mozilla has inspired among Firefox users. I won't bore you here with any lectures on the benefits of open-source software -- it's enough to know that you're looking at one of them, or rather hundreds of them, right on that site.

Picking your first extensions is a tough job; there are people who wandered into AMO's digital labyrinth months ago, and they're still in there. If you find it tough to eat just one potato chip, there's a good chance that trying to install just one extension will make your head explode.

Spare your sanity (and the curtains): Start with these key Firefox extensions that belong on every user's desktop. Even if you decide for some reason to run without them, knowing about these extensions is a matter of basic Firefox literacy -- and disabling or uninstalling them takes a matter of seconds.

(Hint: If you're an impatient sort, you can jump directly to our Quick-Click Chart to download without the details.)

	Want More?
	Believe it or not, this article barely scratches the surface of Mozilla's add-on architecture for Firefox. For an in-depth look at the latest, coolest, and lamest extensions, check out Scot Finnie's ongoing coverage of the Best Firefox Extensions And Customizing Tips. You'll also find links to useful Firefox-related sites and timely how-to content -- and best of all, Scot's site never dispenses advice older than the magazines in your dentist's waiting room. For a basic guide to installing Firefox extensions, don't waste your time wandering the Web -- look no further than the browser's own Help menu, under "Customization: Extensions" in the Contents list. If things begin to get weird (they probably won't), Scot's brief tutorial on How To Install Firefox Extensions will get you back on the right path.