Firefox is the bomb! Why do I love it? It's MY browser. I can customize it to be just the way I like it. I guarantee mine looks much different than other people's. Block images from certain servers, if you disable cookies, and you set only certain exceptions, those are the only cookies you'll ever allow! Pop up blocker works like a charm! Find as you type!! Just start typing right on your browser and it will find the word in the document, and now you can highlight that word! Tabs, sigh, bookmark an entire set of tabs and open them all at once. I love the way that secure sites show up in yellow in the addressbar and verisign ones show up green!
I love extensions so much, I cannot describe. I use tons of them.
My favorites:
Tabbrowser Extensions. I know some people don't like this one but I find so useful when dealing with tabs. I like clicking on a bookmark and watching it open in another tab. Things like that.
Link Visitor - Sigh

. It marks links visited or unvisited. I love that control.
Calendar - especially since I can transfer ICal files to it.
Calculator - I need a calculator that opens in my browser, end of story :d
chatzilla - IRC on your browser, hell yeah!
gmail notifier - little cute gmail icon at the bottom of the browser
download statusbar - download files straight to the statusbar, less inobtrusive than the download manager. I love this one!
statusbar clock - See the date, day and time right at the bottom of the browser. I looooove this one.
Adblock - blocks ads, but most importantly, I can block any image I want, permanently.
Cards - Need to play solitaire on your browser? Very useful especially in my little work ibook because it doesn't come with any kind of solitaire. I have to get meetings somehow, don't I?
Bookmark Backup - make automatic backups of your bookmark files each time the browser closes! It's useful for me as I like to keep a current backup of important files and what is more important than the bookmark file!
IEview - for those who say that Firefox doesn't always render a site properly. I admit that there are a few sites out there that people insit on coding for IE only. This extension lets you right click on a link and open it on IE. THis way you don't open that nasty browser unecessarily
Other ones I have:
toolbar enhancements - more cute buttons for the toolbar!
favicon picker - easily change the favicon for a bookmark
Permit Cookies - easily change the allow/block cookies for each site by pressing alt-c
cute menus - cuteness for right clicking menus
blockfall - like tetris
downthemall- a great extension for downloading all links in a page, like a page with lots of picture links. The new version for the latest version isn't out yet, but should be really soon!
Did I tell you, I love extensions?
I understand though that if you aren't a tweaker, you won't love all the extensions.
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"Trust is a risk masquerading as a promise."