According to the latest update to w3schools browser statistics, Firefox has climbed to 25% of the browser market and Internet Explorer 5/6 has dropped to 64.8%. W3schools is a very popular site with web developers and has shown Firefox increasing and Internet Explorer decreasing since before Firefox hit version 1.0 (although they classed it as just Mozilla back then). If you add the full Mozilla suite’s market share to that of Firefox, then the Mozilla browsers are just under 30% market share now.
As much as I love Firefox, the fact that it is becoming more popular doesn’t impress me, but the fact that IE usage is decreasing makes me satisfied. Check it out here.