I found this presentation of a concept phone from Mozilla labs:
To be honest, I’ve been a bit disapointed as it is a patch of different technologies already available from different companies: pico projectors, laser keyboard.
And the funny thing is the UI: when projected from the projector of course this is a Firefox browser but one can clearly see it is a Windows 7 environment, and when displayed on the screen one recognizes an Android icons set.
The only interesting point is that your mobile is your computer and depending on the context is a laptop or a phone.
To be honest, I was expecting a bit more from Mozilla.