Firefox OS is an open source operating system for smartphones and tablets. It aims to break the dominance of closed platforms by using open web technologies like HTML5. Firefox OS has seen early success in Latin American countries, gaining market share of over 10% in Venezuela and Colombia. It provides an opportunity for over 200 million feature phone users in developing markets to upgrade to affordable smartphones. Carriers and web companies can leverage Firefox OS to capture this new user base and make their online services available across platforms with little development effort.