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Where you can't subscribe an address book in Thunderbird to a CardDAV server this is an excellent alternative. It would be EVEN better :-) if you could right click a contact and opt to add to an address book in a context drop down.

Thanks for the work you've put in.

Это отзыв для предыдущей версии этого дополнения (3.0). 

Thank you for your suggestion and I will include that feature in the next version.