The Mozilla Foundation’s Firefox development team has decided enough is enough and will stop supporting Windows XP and Vista in March 2017 and also bin Firefox OS.
The OS first. In this post Mozillans Ari Jaaksi and David Bryant, respectively the head of connected devices and veep for platform engineering, write that “By the end of 2015 Mozilla leadership had come to the conclusion that our then Firefox OS initiative of shipping phones with commercial partners would not bring Mozilla the returns we sought.”