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Mozilla has put the long awaited Windows 8 Modern UI version of Firefox in its Aurora testing channel, allowing more people to check it out before it becomes part of the final version of Firefox

From Neowin:
The development of Firefox that's being made specifically for the Modern user interface of Windows 8 reached a new level of testing today. Mozilla has now confirmed the Firefox Modern UI port is available for download from its Aurora channel, opening up the build to a new round of evaluations.
  Firefox's Aurora testing channel now has Windows 8 Modern UI build