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Collections are groups of related add-ons that anyone can create and share. Explore collections created by other users or create your own.

Thunderbird Add-ons? Here's Some Great Ones! โดย Ken Saunders

Thunderbird add-ons that I've either used for years, or tested and highly suggest.

Mozilla Labs Messaging Add-ons โดย Firefox user a5b696

The add-ons included in this collection are all ones that are part of the messaging category on Mozilla Labs: https://mozillalabs.com/messaging/