Hi there,
my scripts stopped working a few days ago. I guess it has something to do with the API key but i don’t really know stuff.
When they first stopped i tried looking things up and found out that it could have to do with the API key and recklessly changed the keys on wanikani (v1 and v2). Of course nothing changed. Then I just reset my scripts to factory adjustment and everything worked again. Next day (after closing and reopening firefox) they stopped working again 
Unfortunately I don’t know how to check the API things or insert it manually or whatnot.
So here’s what i do know:
I’m using Firefox with Tampermonkey.
The Kanji Highlighter script works fine.
I do have WK Open Framework.
When only using the Open Framework script on wanikani the following message shows up in the browser-console:
Unchecked lastError value: Error: Could not establish connection. Receiving end does not exist. background.js:4
If you need anything else please tell me.
What do I need to do? Please help me senpais 
Exactly what I was going to say. ^^