I'm thinking Firefox is superior in all ways to IE.
The security add-ons are the best. I basically stopped using IE and looked for an alternative when some random script in some site put a virus on the computer. -.-
After that, I went into a short phase of paranoia and found Firefox, and instantly had to put as many security add-ons as I can. -.-
(Though, this was on an older version of IE, and probably already fixed in the latest one)
Still... I'd prefer FF. ^_^