Developer reply by Philippe V.
Rated 4 out of 5 stars
The problem with version 53.2 has been resolved promptly with an update. I am still trying to understand the advantages of the vCard standard over the one already in Thunderbird. vCard doesn't seem to have caught on.
This review is for a previous version of the add-on (53.5). This user has a previous review of this add-on.vCard allows you to have unlimited email addresses, physical addresses and phone numbers. It is also a bit more customizable...
To create your own collections, you must have a Mozilla Add-ons account.