According to W3Schools.com - one of the internet's most popular web development tutorial sites - Firefox is now more popular than Internet Explorer. As of July 2009, their usage statistics indicate 47.9% of visitors use Firefox, while only 39.4% use IE, and a combined 11.9% use Chrome, Safari, and Opera. These are very interesting statistics. But like any statistics, one needs to be aware of where the data is coming from. These usage statistics are taken from visitors to w3schools.com, who sums it up pretty nicely: It's quite interesting to see the differences in numbers from site to site. The social networking mega-site Facebook, which is obviously geared toward a whole different crowd, reports these numbers as of June 2009: Internet Explorer: 50%, Firefox: 38%, Safari: 4%, Chrome and Opera: 3% each And just for fun, here are the statistics for my personal web site for July 2009 (98% of my site's traffic goes to either my Star Wars Image Archive or my Star Wars OT Screenshots site): Internet Explorer: 46.2%, Firefox: 43.2%, Safari: 6.7%, Opera: 1.5% More usage statistics can be found here.