I found a really handy extension for T-Bird today. This add-on gives you the ability to import and export V-Cards from Thunderbird. It’s called MoreColsForAddressBook. What you get after installation are three more items under the tools menu:
Action for Contacts
Action for List
Action for Address Book
The Action for Contacts menu is the one that gave me the functionality I desperately needed. I am now able to import VCFs from people that send them.
I haven’t experimented with the list and address book menus, but will when the functionality is needed.
MoreColsForAddressBook is available at https://nic-nac-project.de/~kaosmos/morecols-en.html.