I do agree that from my experience FF has been less vulnerable to pop-ups and other spyware. I have a router, firewall and anti-virus so I don't get too many "attacks" anyway.
Thing is, as most of us have said all along, the more popular FF becomes, the more appetizing it will become for hackers and that is starting to happen.
Agreed. IE's problem is that it IS the browser for the world at large.