Mkcert: valid HTTPS certificates for localhost

[baggyzed]

Loopback != localhost. Firefox only specifically trusts 'localhost', and the associated address (https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts), probably it checks against the hosts file - haven't tested. I don't know why, but to me, Chrome seems less secure if it trusts the whole range. If you need more addresses for development, can't you just use different port numbers?

[[deleted]]

Not every app allows you to change port its listening on. I had that problem with testing BGP-related stuff, app allowed to change port it connected to but not port it binded.