Cordova is good because you can make the app in HTML and then publish it to be multi-platform (i.e. android and ios). This is just adding a platform to that pro

Cordova is good because you can make the app in HTML and then publish it to be multi-platform (i.e. android and ios). This is just adding a platform to that process. The fact that the platform they are adding already running apps in the same framework you've written your mockup in is secondary. Wrapping an HTML app into a firefoxOS app is fairly simple, but this will now handle that process for you.