Add kerberos-Support for caldav servers
This feature request was already made in a thunderbird addons review: https://addons.thunderbird.net/en-US/thunderbird/addon/cardbook/reviews/1157611/
problem to solve
Authenticate with servers using GSSAPI.
💡 idea for improvement
It would be nice to support GSSAPI (Kerberos) authentication so it's not necessary to input the password repeatedly.