As much as I love Firefox, I can't see it becoming a commerical success. Microsoft is having difficulty as it is, and unless you've got someone "new" and something "shiny" for consumers to go, "OH!" then what's the point in repeating the steps of what we already have with Android?
I just don't understand why they're attempting this? It's left me scratching my head. I can understand Ubuntu's motive, and it kind of has a "unique" selling point with being a dockable PC, but let's face it, even Ubuntu will have difficulty breaking into the market unless it allows for migration or integration of Android apps, Google contacts, and a lot of other things people will use on a daily basis.
People do not like change, unless it has something that they're current [object/device] has.
Tbh, I've seen a demo of Firefox OS, and it doesn't look that good tbh. It's stuttery and not very well thought out.