Computerworld: Over the weekend, the Mozilla Foundation reported that version 4 of its Firefox open source Web browser had been downloaded more than 100 million times. Although that's an impressive number market research firms say that all the downloads haven't increased Firefox's overall market share. In fact, according to StatCounter, Firefox usage is actually down 0.3 percent so far in April.
Microsoft's share of the browser market has also decreased slightly, despite the release of Internet Explorer 9.