Please either add this new policy to firefox:
"HttpAllowlist": ["http://example.org",
"http://example.edu"],
"HttpRegexAllowlist": ["http://.*\.customtld",
"http://.*vpntunneled\.local"],
Or add regex support to the existing HttpAllowlist policy
Machines of our users have a virtual network interface that lets them access IP addresses on our VPN. Those machines also use our DNS server that responds to queries about universally accepted TopLevelDomains generally used on the internet AND also respond to queries about our custom TopLevelDomain that is only used for ip addresses of services in our VPN. Due to the fact that our VPN already provides traffic encryption we find it unnecessary to use HTTPS for those services and we would like to use a regex expression to allow HTTP connections for domains under our custom TopLevelDomain.
We can't just disable HttpsOnlyMode because our users still browse the regular unencrypted internet.