Firefox Klar for Android has built-in light and dark themes so you can customize its appearance. You can also choose to have the theme set by battery saver.

Set theme to light or dark

1. Klepněte na tlačítko nabídky vedle adresního řádku:

   

2. Tap Settings.
3. Tap General.
4. Under Theme, tap Light, Dark or Set by Battery Saver.