Firefox OS has been on the horizon for a while now, and Mobile World Congress in Barcelona saw the first device partnerships announced for the fledgling mobile operating system. Though not showing any hardware in Barcelona, a press release was issued detailing Sony's plans to release a Firefox OS powered smartphone in 2014 in partnership with Telefonica. 

What we have here isn't quite a Sony Firefox phone, not by any stretch of the imagination. But, what it is, is a working experimental build of Firefox OS for the Xperia E. In line with their plans to develop devices carrying the software, Sony hopes that interested developers and early adopters will take a look and garner valuable feedback. 

The key thing to remember is that Sony has released this as an experimental developer ROM. It isn't meant to be a daily driver, although from the promo video we see here it looks reasonably functional, with even the camera app working properly. 

We know some of you kids like playing around with new stuff -- our own editor-in-chief Phil Nickinson played with an early, early build of Firefox OS -- so if you happen to have access to an Xperia E and try this out, be sure to share your experiences with us. 

Source: Sony Developer World