@robfitz, not related to the content as I couldn't get to that on Firefox 95
Opening the website returns:
NS_ERROR_NET_INADEQUATE_SECURITY
By a cursory glance, it looks like some misconfiguration (supporting HTTP/2, but no presenting TLS1.2 at the same time .. even that it looks available).
SSL Labs results may help you diagnose [1]
[1] https://www.ssllabs.com/ssltest/analyze.html?d=www.robfitz.c...