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CloseReview for Addressbooks Synchronizer by linkbox8
Rated 5 out of 5 stars
Brilliant add-on. I use it to upload/download my address book to/from my Dropbox folder, and so copy my address book to all my copies of Thunderbird on different laptops.
This review is for a previous version of the add-on (1.0.7).To create your own collections, you must have a Mozilla Add-ons account.