There is an official marketplace offering from Mozilla: http://marketplace.firefox.com http://marketplace.firefox.com but others are free to implement their own

There is an official marketplace offering from Mozilla: http://marketplace.firefox.com http://marketplace.firefox.com but others are free to implement their own and no one has to use the official one. The apps will run on both the OS and Firefox for Android, Firefox Desktop. I tend to agree there are advantages to a packaged SDK but there are project initiatives such as Mortar to cover this base also.