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You gave a choice of background color, I do not like the red I selected. How do I change it

You gave a choice of background color, I do not like the red I selected. How do I change it

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If you are referring to the colour of the browser, go to Add-ons and Themes (ctl+shft+a or in the menus), select Themes in the left panel and enable the theme you want to use. If none are to your liking, you can install one from https://addons.mozilla.org/firefox/themes/

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You can update your selection by following the steps from Personalize Firefox with Colorways