How to change themes in Firefox Preview

You can change the look and feel of your Firefox Preview app at any time. You can select from any of the pre-installed themes.

To change the Firefox Preview theme:

  1. Tap the menu button.

  2. Tap Settings.
  3. Tap Theme from the Basics section.
  4. Tap one of the following radio buttons:
    • Light
    • Dark
    • Set by Battery Saver

If you select Set by Battery Saver, your Firefox Preview UI will be dark when the Battery Saving mode on your device is enabled.

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