Mozilla Firefox OS

Firefox OS 1.0.1 Notes

First offered to partners for release on July 2, 2013

As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.


Firefox OS is a mobile operating system developed by Mozilla. It uses a Linux kernel and boots into a Gecko-based runtime engine, which lets users run applications developed entirely using HTML, JavaScript, and other open web application APIs.

These version notes document the features, changes, and known issues, as well as links to useful resources to help developers and partners work with this open web technology.


Welcome to the first release version of the Firefox OS mobile operating system. This version contains many core applications required for a smart phone but also some features that highlight the benefits and uniqueness of our open web platform offering.

  • Adaptive App Search

    Information on any subject right when you need it

  • Marketplace

    Your go-to source for the best apps for Firefox OS

  • Firefox browser

    The fast, smart, safe way to get the best of the Web

  • Contacts

    Import your contacts from your favorite social networks

  • Camera

    With built-in style filters for fun, creative shots

  • FM Radio

    All the audio you want on the go, all on one device

  • Maps

    Includes directions, traffic and local transit information

System Applications

These apps come pre-installed in every Firefox OS device and provide basic smartphone capability. For more apps that can be installed on a device visit the Firefox Marketplace.

  • Home Screen

  • Dialer

  • SMS

  • Contacts

  • Gallery

  • Video Player

  • Music Player

  • Settings

  • Marketplace

  • Clock

  • Camera

  • Firefox Browser

  • Email

  • Calendar

  • FM Radio

  • Usage

Platform Highlights

Gecko platform based on Firefox 18, major changes completed May 21, 2013.

  • SMS

  • 3G/Data

  • WiFi

  • Open Web Apps

  • Voicemail

  • MozApp support

  • Persona / ID

  • Carrier billing

  • Bluetooth

  • Network Manager

  • USB device storage

  • Multi-process support

  • Async pan/zoom

  • SIM Toolkit

  • Multi-APN support

  • Full Screen

  • WiFi Hotspot

  • Software Updates

  • Cell Broadcast

  • Notification Settings

  • UI Transition/Animations

  • Localization support

  • First Run Experience

  • Call Waiting

  • Call Forwarding

Supported Locales

  • Portuguese (Brazil)

  • English (US)

  • Spanish (neutral)

  • Polish

  • Croatian

  • Czech

  • German

  • Hungarian

  • Romanian