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
Mozilla Corp has asked a federal judge to order the US government to disclose a vulnerability in its Firefox web browser that the company says the FBI exploited to investigate users of a large and secretive child pornography website.
Mozilla filed papers in federal court in Tacoma, Washington, on May 10 seeking information on a vulnerability in a browser used to view websites on the anonymous Tor network that is partly based on the code for Firefox.
