toonhq makes my eyes hurt
this is now updated for the new toonhq, which is virtually mandatory for modern TTR. i currently use it to spare my eyeballs but it is certainly not complete (nor particularly beautiful, but whatever)
install Stylus and then use Stylus to install the toonhq-dark usercss
toonhq-dark is licensed to anyone under the terms of the Creative Commons Attribution-ShareAlike license, version 4.0 (or any higher version, at your option). for the relevant legal text, see https://creativecommons.org/licenses/by-sa/4.0/legalcode, or the LICENSE file for a plaintext version