I have the same problem with tuning; it doesn't work in either Firefox or Google Chrome.
It also doesn't work on Itch.io and newgrounds.The Itch.io launcher also has infinite tuning.
This is the errors in the Firefox browser console:
Uncaught SyntaxError: illegal character U+FFFD JedyneFappyParty 1.4 fix.framework.js.br:1:2
Unable to parse Build/JedyneFappyParty 1.4 fix.framework.js.br! This can happen if build compression was enabled but web server hosting the content was misconfigured to not serve the file with HTTP Response Header "Content-Encoding: br" present. Check browser Console and Devtools Network tab to debug.