Mankind's Precious User Styles
These styles provide a customized Firefox Nightly (with the new Australis interface) user interface—clean and simplified, with a bit more space here and there.
About Mankind’s Precious
Mankind’s Precious is a work-in-progress collection of user styles created for Mozilla Firefox to increase the usability and readability of sites and apps. Visually, they are inspired by Solarized, Mozilla, and Firefox OS.
Nice and spiffy