It's really easy. As he said, the only real difference between a webpage and a FirefoxOS app is the manifest. I made a small Pomodoro app (https://github.com/w

It's really easy. As he said, the only real difference between a webpage and a FirefoxOS app is the manifest. I made a small Pomodoro app (https://github.com/worldsproject/pomos https://github.com/worldsproject/pomos) as a test for learning the Chrome Web Store and FirefoxOS markets. Chrome disallows some things, in my case localStorage, and replaces it with their own alternative. While not major, I still had to make adjustments. I also had to define a window. Again, not minor, but these still keep it sufficiently different from a normal webpage. Whereas with the firefox app, I just had to write a manifest, and it worked without any changes. The Chrome store is a bit more refined though, it has better and more options for displaying promotional graphics, and looks better overall.