
Firefox takes all my memory on the computer (Uses about 50%-100% more RAM than IE, just now with indie-resource.com in both, firefox uses 145MB or RAM while IE8 uses 35MB of ram....quite a difference huh?

On the other hand Firefox gives me alot more plugins and styles. And that is their main advantage over IE, if IE start getting alot more plugins then Firefox will have a hard time.
Opera is also great, really quick. Memory usage is about the middle of IE (87MB for indie-resource.com). It lacks alot of plugins, but instead offers them built in from start, like adblock making it more stable and secure. But personally there is some few details about the browser that annoys me so much that I can't use it as everyday browser, can't put my finger on many of them though, just small things.