Interesting find. Thank you for workaround!
Despite this, website is not stable, sometimes connection fails and it doesn't open (firefox error: NS_ERROR_UKNOWN_HOST)
When I opened forbidden game page, I got PR_CONNECT_RESET_ERROR
From this I can assume, that the blocking works as it should (only for one page)
Hopefully, the problem is on itch.io side, and the website will be fixed soon.