Just noticed this script stopped working for me recently. It gave an error message:
ReferenceError: GM_addStyle is not defined
Stack trace: scriptInit@user-script:wkoverride/Wanikani%20Override:549:3 userScript@user-script:wkoverride/Wanikani%20Override:588:1 scopeWrapper@user-script:wkoverride/Wanikani%20Override:598:9 @user-script:wkoverride/Wanikani%20Override:361:17
Any idea how to fix this?