When I try to bring up the UF login ( https://userfrosting.app/ ) I get this:
Your connection is not secure The owner of userfrosting.app has configured their website improperly. To protect your information from being stolen, Firefox Developer Edition has not connected to this website. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox Developer Edition may only connect to it securely. As a result, it is not possible to add an exception for this certificate.
This does not happen with plain Firefox.