A simple script which converts Thingiverse to a darker theme. Source code here: https://github.com/LuckDuracell/ThingiverseDark
This is a simple script which overwrites the elements on Thingiverse to make the background colors darker. The code was written by a 17 year old developer (hey that's me) in like two hours, and hopefully won't be necessary for long because Thingiverse should just make one themselves.
All Source Code for this project is listed here:
Feel free to make any revisions or changes as you see fit.