Owwww you pissed off darksat now
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I use opera most of the time its much less of a hog, and it has had the hand over firefox for many years.
What does anoy me is people that think mozilla invented tabbed browsing what bollocks, they made it public due to firefox's open source coding which obviously hit the band wagon.
IE is a very annoying memory hog as well as the VERY slow tabbed browsing I tried it a few times and hated it, was so much faster using IE6 and opening a new page.
Firefox is faster, but the only real advantage is that firefox has a MASSIVE community so it has a lot of VERY useful extensions.
Opera doesn't have these extensions which is a major annoyance to me, opera can do a lot of the stuff firefox extensions allow but it is just harder to find and use. But the fact opera has a lot of this stuff, says that it is a very very powerful browser and has leaded the way for many extensions for firfox.