When porting a chrome packaged app to a firefox packaged app you will need to do an inventory as to which chrome specific api’s you are using and create a level of abstraction around them, as the naming / capabilities of the api’s vary across the platforms. David Clarke did the great leg work breaking down the current differences between the Chrome App and Firefox OS APIs. This is a great resource for anyone building web apps today! Check it out today . I'd love to see this kept up to date somewhere.