The free Firefox web browser has gained an amazing following in the 6 or so months that it has been a stable release. According to the Asa Dotzler of Mozilla.org fame, Firefox has just about reached the 40 million downloads mark. Not a bad effort for a free Open Source web browser. The statistics do not count downloads from the auto update patching system, only direct downloads are counted. The other surprising tidbit from Asa’s post is that Thunderbird, Firefox’s much less known free email client sibling has been downloaded over 5 million times.