Is Firefox better? Probably is. However, there are still some sites out there that don't work as well with it because they are designed to be used with IE, and take advantage of some of the "features" of the IE browser.

This gets annoying enough for me that every time I try to switch to firefox, I end up back at IE. I don't like having to switch back and forth between two browsers. Firefox does seem to load pages faster though and has the tabbed browsing that was mentioned as well.