The Mozilla suite is getting bloated...it's like Netscape (they use the same Gecko engine and share even more of the code).
If you want to ditch IE, go with Ronin's suggestion and use Firefox. Tabbed browsing is one of the best things I've found with Firefox....LOVE IT!
(Tip: click on links using the scroll wheel with your mouse. It opens them in a tabbed window)
Cum ignis armi proscripti erunt tum soli proscript ignis armatas habebunt. Morituri te salutant.