Firefox 4 is the greatest update to firefox ever!
Download Update:
Firefox 4Also I recommend you get this theme:
LavaFox V1-GreenTheme's are ONLY for Firefox 4 and are really cool. Also Personas do not work while using a Theme.
WARNING!: Some of your add-ons may not be compatible. Like Norton Toolbar is currently not compatible which is very bad and annoying to me because I really need it but that is why I have it on IE just in case I need my passwords