I used to use it back in the day of Win. 98 and the beginnings of XP. Until my parents got parental controls; then I'd use Opera and a proxy to bypass them.
Then Explorer started becoming more and more crappy. Lagging and crashing and hardly being compatible with half the flash websites I used so I abandoned it in favor of FireFox. xD
I was actually originally drawn to FireFox because of the multi-tab in one window deal. But now most browsers implement that I think.
I do not enjoy Google chrome B| for many reasons. For one, they keep documentation of searches and websites their users hit. So I use Google search for research and stuff but for the most part I keep websites to the URL in FireFox. I don't want my stuff documented that's just... messed up. heh.