IMHO, I doubt that's main issue here. FF supports web workers for a long time (my current version is 101). I do disable them using uBO but:
1) I don't get CSP error about worker-src rule in console (which appeares whenever site tries to start web worker);
2) I excluded v6p9d9t4.ssl.hwcdn.net domain from uBO rule and other games that was requiring workers were working fine.
Rule in question:
*$csp=worker-src 'none',domain=~aniqit.com|~html.itch.zone|~twitch.tv|~v6p9d9t4.ssl.hwcdn.net|~captcha.website