Looks like this might only be an issue with dark-mode. In regular mode the active tab is very visually distinct. I think this is a more general problem with da

Looks like this might only be an issue with dark-mode. In regular mode the active tab is very visually distinct. I think this is a more general problem with dark-mode interfaces. Contrast of content is usually easy to achieve (e.g. light text on dark background) but getting contrast between UI elements like tabs is quite difficult. Apple had a great talk about the design challenges at WWDC 2019. One of the ways they do this is by integrating ambient colours from things like the desktop wallpaper which Firefox doesn't do.