There are several different builds of Firefox OS you can download or build for yourself, and there are some differences between the types of features available on each device. The chart below should help you understand what works and what doesn't on the various builds.
| Feature | Device | Emulator | Desktop |
|---|---|---|---|
| Dialer | All | UI only, no network | UI only, no network |
| Contacts | All | All | All |
| SMS | All | UI only, no network | UI only, no network |
| Camera | All | UI only, no camera support | UI only, unsure about desktop camera support at this time |
| Gallery | All | All | All |
| Video | All | UI only | All |
| Music | All | All | |
| FM Radio | All | All | UI only |
| All | All | All | |
| Calculator | All | All | All |
| Browser | All | All | All |
| Marketplace | All | All | All |
| Clock | All | All | All |
| Calendar | All | All | All |
| Home Screen | All | All | All |
| Lock Screen | All | All | All |
| Keyboard | All | All | All |
| Task Manager | All | All | All |
| First-Run | All | ? | ? |
| Notification | All | All | All |
| Status Bar | All | Some network states can't be tested | Some network states can't be tested |
| Settings | All | All | All |