I have for a very long time used Firefox, because Firefox has had tabs which i like very much instead of having 6 or 7 windows open. I also hate all these adds and have use adblock to get rid of them. I also used an add on called IE tab, where i can run websites that needs IE, like Outlook web access.
I recently found an add on to IE where I can block ads, and as we know, from IE 7 you can also browse in tabs. Check out IE7Pro
So now i don't know what broswer i should use, it's looking though i'm going to use IE at work for all systems that rely on IE, and thats alot of systems.
At home I'm still going to use Firefox. I like the browser and i'm used to it now.