i had the opportunity to work on the FF OS and it was very similar to building a chrome extension or phone-gap solution. This was back in 2013 and the interface, support was very sub par. I worked directly with FF on the deployment of our app! The devices / OS version mix played a big role in tuning, retuning nad detuning the app. I wondered how long would it take for FFto kill off the initiative! 2.5 years!!