I have been using Firefox for 6 months. Funny thing, every since I started using it I do not
have to put up with pop ups and the like. I use the Adblock Plus extension and it eliminates about 98% of the crap I used to have to put up with in IE.
For sites that need IE, I installed IE view. You can add IE sites that refuse to render in Firefox and it automatically makes the switch seamless. In addition, there is IE tab that allows IE to open in a tab.
I am not going back to the clunky IE and have become a Firefox fan. I have 42 extensions installed and it works great.