Firefox has been my fav browser for years but seems like it just keeps getting bigger and more bloated. Maybe its just me but it really seems to have some serious memory leakage going on so I'm not as crazy about it as I was in the past. I've been using Chrome more and more lately for some of my browsing, but Roboform doesn't work with Chrome yet so I switch between the two.
The only thing I don't really like about it is that sometimes it doesn't allow you to directly paste stuff - you have to paste it first in a separate pop-up as plain text? For security reasons? That's really annoying, and I just don't get it.
I liked IE because it allowed you to turn off active x. But it was just too slow and kept crashing.