Control screen brightness on Firefox OS
How Do I Control Brightness Manually or Automatically?
Adjust screen brightness by using the Display function in the settings application.
and choose Display.
- If you'd like your device to automatically adjust its brightness to save battery life, put a check mark next to Adjust automatically.
- To adjust the brightness manually, remove the check mark next to Adjust automatically and use the slider that appears.
- Tap the back button at the top of the screen to finish.
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