Rated 3 out of 5 stars

Pointed it at my carddav server, which has "carddav" right in its URL, and the addon responded that my carddav server, which has "carddav" right in its URL, doesn't support carddav. EDIT: I don't remember whether I was using FastMail yet when I first posted this, but I do know I shouldn't have given the add-on just one star since it wasn't your fault.

This review is for a previous version of the add-on (4.0). 

Thank you for trying this extension.

If you would care to email me details about the type of CardDAV server that you are trying to connect to, I would be happy to investigate the issue. Please remember that SOGo, Yahoo and Google are listed as unsupported and so are known not to work with CardDAV Browser.

Unfortunately not all CardDAV servers are 100% standards compliant (eg: Radicale states "we decided not to implement the whole standard but just enough to understand some of its client-side implementations") and so might not work with CardDAV Browser. Also, having "carddav" in the URL does not guarantee that the server is standards compliant.

Thank you.