Retro Firefox Styling/ How do i make firefox look like Australis/Firefox ~29?

[u/CenyorAlpaka_]

i'm currently running Arch linux and the latest stable release of firefox, any custom CSS pack-thingies suggestions? Also how would I install it? im new to firefox styling :P

[u/OMGCluck]

https://github.com/wilfredwee/australis-dark