I just stumbled upon an interesting article by Justin James on TechRepublic that examines Firefox’s meteoric rise to fame. He has taken the W3Schools browser stats and given them a good going over using a spreadsheet that he kindly supplies as a download with the article.
My first opinion is that some people definitely have too much time on their hands. My second is that is gives a new slant to the rise and fall in the popularity of Firefox and IE respectively.
In short the article points out that the growth rate of the Gecko browsers on the whole and the consequential loss for IE has actually slowed since the introduction of Firefox.
He sums up:
At best, we can conclude that while it was bound that non-IE browsers would eventually hit the “glass ceiling” of people who will never leave IE, it may have raised that ceiling a bit.