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A screen displays the logo of the open-source web browser Firefox on July 31, 2009, in London, as the software edges towards it's billionth download within the next twenty four hours. First released in 2004, the browser currently holds around 31% of the market share with Microsoft's Internet Explorer dominating the field with 60%. AFP PHOTO/Leon Neal (Photo credit should read Leon Neal/AFP/Getty Images) Leon Neal, AFP / Getty Images