Jitai (字体): The font randomizer that fits

For some reason I can’t get this script to work for me. I tried downloading both the original script and the updated one in this thread. I’ve downloaded most of the recommended fonts. I’ve tried using both Firefox and Chrome. My userscript manager is Tampermonkey. I’m on Windows 11.

Seems like the script doesn’t run at all, because I can’t see the cog icon on my review screen anywhere. I’ve verified that I have the script enabled in Tampermonkey.

Any ideas on how I could get this script working?

FIXED! Install WaniKani Open Framework