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Changing color theme

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How can I change the color theme on my Firefox for Desktop browser?

How can I change the color theme on my Firefox for Desktop browser?

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It is possible you selected one of the Colorways themes that are included in Firefox. You can find the built-in themes (light, dark, system) and further down the Colorways themes included in Firefox on the "Add-ons and Themes" page (Ctrl+Shift+A; Themes tab).