I dig the combination with the two colors. I might have also discovered my new favorite color/s along the way. But there is one problem though--it's obvious.
I'm not very tolerant with lights, nor with small fonts. Especially when Ff's default font runs thin, there's a hint of strain when I try to read the font. The strain alone feels like I'm being flash-banged by vibrance, lul. Luckily I didn't use this theme when it's pitch black out, trying to read whatnot.
In all/TL;DR: I'd most likely use this extension for the colors, but I wouldn't use it because of my eyesight problems in specific.
