Userscripts.org is dead (wanikani userscript developers, please read)

WaniKani API And Third-Party Apps
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Epicwhale said..
NinKenDo said...Can somebody help mirror this: /t/Userscript-Highlight-Kanji-based-on-WK-level-in-websites/4998/1

 https://greasyfork.org/scripts/708-kanji-highlighter

 Cheers big-ears!