Hallelujah, this extension work with last firefox update (138).

Before that, i tried a lot of extension to change CSS and it didn't work, this extension saved me.

Thanks you very much.

Finally an extension that can change the color of visited links in Firefox version 138.
However, I can't see the menu that appears in the image, how do I access it?
For now the color of visited links is "red", how could I change it?
Thanks a lot
Update: The author kindly answered my question and explained how to get to the settings (extensions icon>gear icon>add to toolbar). Now I can say that this extension is rally awesome. Thanks really a lot, I'm sorry I can't add more stars.

Works great! Nice to have opt in functionality now :)

Saw your post on reddit. Nice work, I'd give 5-stars for as long as it works fine on my Firefox browser :)

Magnifica extension, excelente funcionamiento. Perfecta es lo que se busca cuando se instala. Enhorabuena y muchas gracias por un buen trabajo que facilita enormenente el mio