Firefox OS runs very smoothly, when being simulated on the computer.<p>On the $70 ZTE phone, it's less than stellar, mainly because the phone has issues registering touches. Also, there are some software bugs, like momentum being saved when it should have decayed, after you lift your finger 5s later in certain scrollable views.<p>If the newer phones have better touch screens, and the OS consistently gets improved, especially on UI front, I could really see this succeeding and taking a sizable market share.<p>Regardless, it'll change the game, and motivate Google & Apple to step up their support for HTML as a platform. It's already happening, with Android KitKat [1].<p>[1] <a href="http://java.dzone.com/articles/android-44-kitkat-browser-and" rel="nofollow">http://java.dzone.com/articles/android-44-kitkat-browser-and</a>