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EmailPicky 4 4.0
Grab email addresses from emails from any selected Email Folder and add them to your contacts. (Email Crawler / Email ID Grabber / Bounced email collector) - Thunderbird Plugin
Note: It doesn't create duplicates, but shows as 'xxx messages added'.
About this Add-on
-Right click on the folder you like to pick emails from in Thunderbird.
-Select 'Crawl folder for email addresses'
-Select options in the new window.
-Select an 'Addressbook Folder' - Where you want the picked up emails to be stored.