This document summarizes a presentation about Firefox OS, an open-source mobile operating system powered by Mozilla's Gecko engine. The presentation discusses what Firefox OS is, its goals of supplying an alternative to feature phones and lowering the barrier to app development. It provides screenshots of the home screen and app grid. The presenter notes that developers can sell apps in several countries currently and will receive 70% of revenue. Requirements for building apps are simply knowing web technologies. Current and upcoming features of Firefox OS are highlighted, including push notifications and NFC support. Resources for learning more are also listed.