Much as I try to understand, I think Sun's freeing up of Solaris is a bad bad move. Solaris was their cash cow!
In my microcosm of viewers (of this blog site) Firefox is rapidly gaining in popularity and accounts for ~24% of the market share. Mozilla & Netscape accounts for merely 6%. Overall they account for 32% of the market share.
IE family accounts for 66% of the market and Opera remains a fringe player with less than 2% of the market share.