Alright, I'm feeling better now.
Adblock - Obviously good
Adblock Filterset.G Updater - Convenient, except for that if you want to add something yourself, the next time it updates, you'll have to add it again. That issue might be fixed by now.
All-In-One Gestures - Already mentioned
Colorful Tabs - It might be useless with the newest version of Firefox or Tabbrowser preferences, but it looks nice and helps you differentiate the tabs with your peripheral vision.
Fasterfox - You have it, it's kind of self explanatory.
Flashgot - GREAT download manager. You have to download Flashget too. It's free.
Forecastfox - I don't really like it, as I always end up checking weather.com anyway so I know what hour it might rain, but it gives you the gist of what it will be like, and isn't an inconvenience.
Gmail Notifier - One of the best. If you use Gmail and constantly get e-mails, you can use this so that you won't have to keep a tab of it open.
IE View - For those pages where Firefox just doesn't work.
Image Zoom - Love it.
Nuke Anything Enhanced - Comes in handy when there are large, or buggy things on the screen. There used to be a function where you could permanently nuke it from coming up again, but it's been gone for a couple versions now.
Paste & Go (Currently not available) - Still waiting for the update! However, it's really convenient. Right click on the address or search bar and click paste & go instead of simply paste. Saves a second or two each time, but it feels great to simply have the convenience. I miss it.
ReloadEvery - Helps with auctions and such, but you have to make sure you turn it off once you want to do something instead.
Tab X - Might be unnecessary with the latest version of Firefox or Tabbrowser Preferences, but oh well. If not, it's really convenient
Tabbrowser Preferences - Great. It's a necessity.
Text to Image - Very handy at certain times, but I like to keep it off until I find a bunch of images linked.