How to change themes in Firefox Preview

You are using our older mobile browser, but this article is for Firefox Preview, our newest, fastest browser. Download Firefox Preview here or visit the old Firefox for Android knowledge base.

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.

    preview menu
  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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