Review for Addressbooks Synchronizer by tweedleme
Rated 4 out of 5 stars
I tried it and it appears that it only exports address books in the .mab (Mozilla Address Book) format. I need to export in the .vcs (vcard) format as that's what my iPod classic (5th gen) will read. I use the :More Functions for Address Book" add-on available at https://nic-nac-project.org/~kaosmos/morecols-en.html. Otherwise it has lots of options for downloading and uploading. The address books I selected uploaded to the folder I set it to just fine.
This review is for a previous version of the add-on (0.9.7).To create your own collections, you must have a Mozilla Add-ons account.