Mozilla is waving red flags about Microsoft's forthcoming Windows RT (the variety designed to run on ARM processors). It's claiming that only the Internet Explorer browser will run under the much more (in computing terms) privileged Windows Classic environment. It claims this effectively makes IE the only fully functioning browser on the platform, with everything else being denied access to key computing functions (running as a Metro app). Mozilla argues that if IE can run in Windows (rather than Metro) on ARM, then there's no reason why the other browsers can't. Mozilla then goes on to extend an invitation to Microsoft to "remain firm on its user choice principles". Meanwhile it's not just the Moz that has taken umbrage at the move, with CNET reporting that Google also isn't happy with the situation, saying "We share the concerns Mozilla has raised regarding the Windows 8 environment restricting user choice and innovation." We'll have to wait and see what Microsoft's take on the matter is, but for now it looks like the browser wars are back on.