Firefox is great. But it can be made better! Here are some Add-ons you should consider:

•  WebDeveloper toolbar: in addition to all sorts of things that are handy for web developers, it includes some things that I find really handy just for using. You can disable images, disable external images, disable CSS, convert a POST to a GET (great for URL hacking), disable the cache, disable referrers, etc.
• Adblock Plus: you’ll just never see ads.
• Flashblock: Flash is nice, but sometimes it’s obnoxious. This makes it so you have to click on a Flash element to play it.
• LocationBar2: I actually haven’t tried this yet, but I think I’m about to.
• ShowIP: Displays the IP of the site you’re connecting to. IMHO, this should be standard, although I suppose many people wouldn’t know to look.
• FormFox: This should also be standard! It shows you where the form you’re submitting goes. Again, it’s something most people would overlook, but every now and then I really want to know and have to dig through the source… Not anymore!
• Mouse Gestures: I actually use this for only one reason: a quick roll of my hand across the mouse (right-then-left) should go back. It just seems intuitive. (In fact, I discovered this accidentally in Opera, which supports it.)
• Reload Every: It’s often handy to have a page reloaded periodically, automatically. This does it. (There’s no way to have it watch for updates, though…)
• Greasemonkey: This one basically lets you load scripts which alter the page after it’s loaded. Vague description, but here are some useful scripts for it:
  • eBay Search Pictures: eBay charges sellers a fee to display a picture. Otherwise it shows a little green camera icon. As a buyer, I really like a little thumbnail. This one is ingenious: it’ll make a little thumbnail where there isn’t one, by grabbing it out of the auction. To quote the Guinness guys, brilliant!
  • One to show only negative feedback. I always wished eBay allowed this.
  • Ironically, UserScripts.org, the main site for user scripts for Greasemonkey, has a pretty crappy site. This plugin allows sorting of results pretty nicely.
  • GMail Super Clean is a nice theme for GMail.
  • YouTube Googler makes YouTube’s display suck a little less. The video is much larger and the comments aren’t even loaded. (I don’t know why, but the comments on YouTube are the worst comments of any site I’ve ever seen. Always.) N.B. that if you’re looking for a script to let you download YouTube videos, there are about 30.
  • Those who frequent Flickr will be familiar with the spaceball.gif that’s put ‘over’ images to prevent them from being saved via right-clicking. This is pretty obnoxious in my opinion. I was about to recommend a script to fix it, but noticed that someone has an even better solution: next time you come across a “spaceball.gif” protected image, right-click on it and do “Adblock Image” (assuming you installed Adblock, mentioned above.)
  • GoogleMonkeyR: Wow! This does more than meets the eye. By default it just adds a spiffy blue background to search results, which I thought was lame. But then I found the settings. You can set it up to do multiple columns. I have a fairly high resolution so I have 2 columns. You can remove sponsored links, although I don’t. You can number the results. And there’s the “Autoload” for more, which I thought would just add prefetch hints. But actually, you just scroll down and more results are loaded. This is incredibly spiffy!