I too have written an "app" for Firefox OS[1]. It was a game I had written for browsers using the HTML5 canvas and porting it to Firefox OS was as easy as 1, 2, 3.
This, for me, is what makes Firefox OS promising - apps are simply HTML pages that work pretty much as computer webapps work.
This, for me, is what makes Firefox OS promising - apps are simply HTML pages that work pretty much as computer webapps work.
[1]: http://munchor.tumblr.com/post/46774157520/party-build-for-f...