There are some really great plugins for FireFox as well that really put it heads and shoulders above any other browser. My personal favorites are the spell checker, Google synchronizer and CSS toolbar. The spell checker automatically spell checks in any text box as you type. The synchronizer syncs all your favorites, passwords, history, etc between every computer that you use so I can travel between work, home, and my laptop and always have everything setup the way I want with all my passwords and everything and it is secure protected by a master password that is routinely checked. Finally the CSS toolbar allows me to look at CSS of any site and even make real time changes to it to see how it would look, and I can even over ride it for my own viewing.