I think that the "very successful launches of Firefox OS" claim is odd. While justifying it with the "15 countries with 4 operators and 4 device manufacturers"

I think that the "very successful launches of Firefox OS" claim is odd. While justifying it with the "15 countries with 4 operators and 4 device manufacturers"-style claims may sound good, in practice we don't really see much serious adoption. It isn't even really competing with Microsoft's or BlackBerry's offerings at this point, and even they are significantly far behind Android and iOS when it comes to market share. If Firefox OS were actively competing against Android and iOS, I could see it being called a "success". But at this point it's, at best, the fifth-place player, and realistically it's further down the list than that. There isn't much to indicate that it'll get much uptake, either. So all in all, that's not really impressive, I'm afraid to say. It surely should not be described as "successful".