I’m keeping track of it on github if you want to try it out, there’s a list of todo and bugs inside the script as well.
https://github.com/blaketrahan/wanikani-pitch-info/blob/master/wanikani-pitch-diagram.js
I removed the description and replaced it with the name of the pitch pattern and kept the link. The colors now correspond to the 平板、尾高、中高、頭高 patterns.
I did not expect to spend my Saturday doing this 
