I can't remember the name of the extension that allowed you to color unopened, opened, and current tabs differently. Is an extension still necessary? Or can Firefox do this now?

closed as off-topic by Rubén, user0, ale, serenesat, Alex Jan 16 at 11:40

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  • Questions about web browsers are off-topic on this site unless they are related to a specific web application. Ref. help center. It might be on-topic on Super User. – Rubén Jan 15 at 20:26

Firefox is not able to do so on its own.

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