I use https://color.firefox.com/ https://color.firefox.com/ to differentiate. It's a solid theming system that they built a few years ago, promoted for about a

I use https://color.firefox.com/ https://color.firefox.com/ to differentiate. It's a solid theming system that they built a few years ago, promoted for about a week and then never mentioned again. Probably because they'd rather promote their braindead self-destructing themes (sorry, 'Colorways drops')