Sorry, I should have said that this already works on Firefox OS. It may also work on Firefox for Android, but Apple would have to add support for Open Web Apps

Sorry, I should have said that this already works on Firefox OS. It may also work on Firefox for Android, but Apple would have to add support for Open Web Apps to Safari on iOS for it to work there (and the same with Google and the standard Android browser or Chrome) https://developer.mozilla.org/en-US/docs/Apps/Getting_Started https://developer.mozilla.org/en-US/docs/Apps/Getting_Starte... It's being proposed as a standard, so hopefully Apple and Google adopt the API, but these things take time and politics.