I tried the FirefoxOS homescreen a few months ago. It runs just as fast as Android Java based UI apps on my high end smartphone. On a low end phone or one with

I tried the FirefoxOS homescreen a few months ago. It runs just as fast as Android Java based UI apps on my high end smartphone. On a low end phone or one with little RAM, both Android and FirefoxOS will feel slower (now imagine running FirefoxOS as Android homescreen).