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Re; color changes of tab bar etc

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Today, i opened Firefox and they gave me the opportunity to browse new functions. I changed the color of the tab bar but I can't figure out how to change it back.. Also, I didn't have time to browse the new features. I can't find the site to do so.

Today, i opened Firefox and they gave me the opportunity to browse new functions. I changed the color of the tab bar but I can't figure out how to change it back.. Also, I didn't have time to browse the new features. I can't find the site to do so.

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You can simply reset your theme by opening the Theme page from Add-ons and themes, and selecting your old theme: System theme, Light or Dark, whichever you have used.