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change or delete the top banner on firefox

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How do I change or delete the top background banner on Firefox. It now shows Harry Potter fantasy and I want to change this.

How do I change or delete the top background banner on Firefox. It now shows Harry Potter fantasy and I want to change this.

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Sounds that you installed a Persona.

You can uninstall your current Persona and revert to the Default theme (Tools > Add-ons > Themes).

See:

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Troubleshooting extensions and themes

Check and tell if its working.