The big risk that I see is that too many of the early FirefoxOS devices will be super-lowend phones which could gve it a bad reputation that has more to do with

The big risk that I see is that too many of the early FirefoxOS devices will be super-lowend phones which could gve it a bad reputation that has more to do with crappy hardware. Apart from the obvious handicap of launching an 1.0 product against competitors that have iterated and polished for several cycles already.