Mozilla launched an app that you can download to test Firefox OS in your Android device. It’s still experimental, for developers, but I’ve tried it and it makes my FP1 look like a very new phone. Would be awesome if it finally worked as more than a developer preview!
Anyway, if you want to try it, you can download it from: Firefox OS Help
P.S.: I had a problem with the buttons of the phone and finally uninstalled it but its nice to know thaat it exists and that it can be installed in a FP1 as easy as you install any other Android app.