theres no way if i'm not mistaken to completely get rid of ie if you use windows but the house computer i let my roomates use i set up firefox as the default browser and hid all ie shortcuts.. its the next best thing and if everything is set up and you don't get to curiuos with downloading unsafe programs you will never have a pop up window.

there are probably others that are more experienced with configuring firefox and i'd also be interested in different features to it has.