One by one, the promising new smartphone operating systems, which hoped to chip away at the Android/iOS duopoly, are admitting defeat and refocusing on the less entrenched world of wearables and the Internet of Things. Mozilla has joined that sad procession, in the wake of Samsung Tizen, webOS and Baidu Cloud OS, and perhaps just ahead of Windows Phone, to judge by that platform’s increasingly tiny showing in Microsoft’s results. Although Mozilla numbers about 14 smartphones running its Firefox Mobile OS, and the same number of supporting operators, it said at the turn of the year that it would stop designing handsets. Now it is going a step further and exiting the smartphone sector altogether, shifting its focus to IoT…