Hi There,

Its bean a very wonderful experience on how to have a simulator just in front of your Browser. You hear it right. The simulator of Firefox OS is on Firefox Browser Itself. No hassle. Just It.

Download it: http://people.mozilla.org/~myk/r2d2b2g/

Other Notes: https://hacks.mozilla.org/2012/11/announcing-the-prototype-firefox-os-simulator/