You can always try the Firefox Color add-on and you can tweak any colors to your liking to fit your preferences. It's very straight forward to use Firefox Color and you can always revert any change as well. It's worth trying if that helps better fit your needs.

Thanks mate! Gnome 48 was just recently released, so I'll be updating this theme and tweaking it a little bit as needed next month so it continues to look and feel like the latest Gnome Web/adwaita colors. And thanks again for giving it a try and appreciate the review. Feel free to share it if you know others that might enjoy it as well. Cheers!

Thanks for checking it out, glad you're liking it and hope it looks great on the new Gnome 46 too!