Add-ons

ImportExportTools by Paolo "Kaosmos"

Adds some tools to import and export folders and messages

Collector's Note Very important tool to export/import specific messages, a folder or your whole account in EML or MBOX formats.

Provider for Google Calendar by Philipp Kewisch

Allows bidirectional access to Google Calendar

Collector's Note For each account can sync desired Calendars or specified Task Lists. But tasks order is not preserved and indentation is not shown!

Enigmail by Patrick Brunschwig

Helper tool to migrate your keys and important settings from Enigmail to Thunderbird 78.

Manually sort folders by Jonathan Protzenko, Itagaki Fumihiko

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Saved Password Editor by Daniel Dawson

Adds the ability to create and edit entries in the password manager.

gContactSync by Josh Geenen

Synchronizes contacts & groups between Thunderbird and Google Contacts.

Collector's Note It seems not syncing all contact attributes from Google's! e.g. 2nd, 3rd emails

Mail Merge by Alexander Bergmann

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Collector's Note Very good for Personalized Mass mailing

Quicktext by John Bieling

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Collector's Note Type first chars of your sentence (or a keyword) and then press TAB to AUTOCOMPLETE your specific frequently used sentence. Very useful!

Thunderbird Conversations by Jonathan Protzenko, Standard8

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

Signature Switch by Achim Seufert

Switch the signature on/off or choose a new one from your predefined set.

Collector's Note Quicktext is more powerfull and enough. But having this addon too doesn't hurt!

FireTray by Foudil, Francesco S., others

A system tray extension for Linux and Windows, allowing to set up custom icon, hiding to tray instead of closing, display the number of unread messages in mailing applications, and other features ...

Collector's Note My TB is always running and this addon shows number of unread emails and my chat status. Can't live w/o this!

StartupMaster by htamas

Asks for the master password at startup (fixes multiple password prompt)

Account Colors by DW-dev

Associates user-defined colors with POP3/IMAP accounts and identities. Applies these colors to accounts, identities, folders, message list, message headers and compose headers. Users will always know which accounts/identities they are working with.

Show All Body Parts by Jonathan Kamens

Enable the View | Message Body As | All Body Parts message display mode.

Collector's Note Shows body of an email in HTML, Simple HTML, Text, All body parts. No effect when using Thunderbird Conversations addon.

Duplicate Contact Manager by Marian Steinbach, Copelnug

Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts.

Collector's Note Compatible with gContactSync. A good way to clean up your addressbook AND your google contacts.