I dont care really
I dont mind what i use, i have deployed firefox and IE7 accross my network for everyone to choose from, as a internet browser is a internet browser, they all do the same thing, you judge the internet on the web sites you browse not on the web broswer you browse with, firefox and IE7 have exactly the same features, and are both as secure as eachother.
I do support firefox for the fact that they are opensource and that they have browser that is equivalent to IE7 which is made by one of the biggest companies int he world