Mozilla called it a day with Firefox OS for mobile handsets back in 2015, quietly a company called KaiOS, built on a fork of Firefox OS, launched a new version of the OS built specifically for feature phones, and today at MWC in Barcelona the company announced a new wave of milestones. Was originally the vision of Mozilla in its own mobile effort, as it looked to create a new ecosystem of HTML5-based apps and cheaper handsets for the developing world
https://techcrunch.com/2018/02/26/kaios/
https://techcrunch.com/2018/02/26/kaios/