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Free 'Browser in a Box' Runs Firefox 4 with Ultra Security [pcworld.com]
Originally created at the request of the German federal government, BitBox (short for "browser in the box") runs on Windows XP, Vista and Windows 7 as well as Debian Linux, Ubuntu, OpenSUSE and Gentoo, allowing users to surf the Web worry-free, Sirrix says.
BitBox's security derives from the fact that the browser runs in a virtualized environment using VirtualBox 4.04 and a hardened implementation of Debian 6 Linux. The included browser--Firefox 4--then runs in a separate virtual machine with its own operating system, keeping it completely separate from the rest of the user's system.