Some quick stats: for the month of August 49% of visitors to this site used Firefox. For September so far, over 57% of visitors use Firefox. In both months, visitors who use Internet Explorer are only in the 20% range, with other unknown browsers making up the rest.
September was a high traffic month as well, so I would have actually expected it to shift less in favor of Firefox.
If you’re on a PC and you’re not yet using Firefox you might as well just give up. Children in Indonesia own your computer despite your best efforts. Go get it and never open Internet Explorer again.