http://en.wikipedia.org/wiki/Usage_share_of_web_browsersThat's where I took my data from. 66% IE, 23% FX. I would propose that FX users are, on the whole, more computer and internet savy than IE, so it would not be outside the realm of possibility that they would be more active on the FRB. Such as 2 of the top 3 forum posters (Paul and Sasha), versus 1 IE (me).