Moz. Firefox user here.
tabbed browsing, no popups, great controls, and just a very wicked fast simple browser.
Encouraged the better half to use it, but every once in a while she comes across a site designed for IE and it won't work. I explain that it's because some idiot webmaster's don't understand about coding to open standards, but it still gets her down on Firefox.
Also for work we have many inhouse webapps that will only work with IE, not much I can do about that.
for the stuff that has to have IE, there is Avant Browser a free "wraparound" program for IE, that includes tabs, popup blocker, among other things. Check it out if you have to use IE.