Add-ons

Provider for Google Calendar by Philipp Kewisch

Allows bidirectional access to Google Calendar

Enigmail by Patrick Brunschwig

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

German Dictionary by KaiRo

German Dictionary (new Orthography) for spellchecking in Mozilla products

Quicktext by John Bieling

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

Mail Redirect by Onno Ekker, Pawel Krzesniak

Allow to redirect (a.k.a. "remail") mail messages to other recipients.

Diccionario español México by eduardo_moreno

Diccionario para México.

CompactHeader by jmozmoz

Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.

Collector's Note Unabdingbar - z. B. um Druck-, Redirect- und andere Icons in das neue Feld über der Nachricht zu übertragen!

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 Great! It works again!

United States English Spellchecker by jooliaan

This dictionary is no longer maintained. Use this dictionary instead.

Allow HTML Temp by Alexander Ihrig

Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).

Gnome Open by J. Arnds

Open your mail attachments directly with your default gnome application.
ONLY for GNOME USERS!

Is Gnome Open still needed? Please read "Developer Comments" below.

Collector's Note Seit TB 3 unabdinglich, da sich sonst Anhänge nur sporadisch öffnen lassen. Jetzt läuft es über Gnome.

Copy Sent to Current by Günter Gersdorf

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

AddressBookTab by pastisman

It adds a button that can be put in toolbars and that open the addressbook in a new tab

Collector's Note Für TB3 unabdingbar!

Gnome Integration by vaites

Provides better integration with Gnome using standard notifications and other features

Collector's Note Only Add-on working with lucid and tb3. (Minimizing with alltray)

Dictionary Switcher for Thunderbird by Dao Gottwald, MrWarper

Toggles spelling dictionaries automatically or manually and displays the currently selected one in the status bar.
Now merged with Dictionary Switcher v1.3 for Firefox/SeaMonkey