I remember hearing people were super-excited about it, and I kept thinking "It's a theme-customizer for your web-browser. Neat, but why is everyone going crazy

I remember hearing people were super-excited about it, and I kept thinking "It's a theme-customizer for your web-browser. Neat, but why is everyone going crazy for it? What's the big deal?" Sadly, I never looked into it to find out more until after it was canned.