Add-ons

Enigmail by Patrick Brunschwig

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

Spanish (Spain) Dictionary by tnarik, RickieES

Spanish/Spain Dictionary

Walnut2 for Thunderbird by alfredkayser

Walnut2 for Thunderbird, based on icons from art.gnome.org. Walnut2 is based on Walnut but with better looking wood panels.
Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

United States English Spellchecker by jooliaan

This dictionary is no longer maintained.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

Walnut for Thunderbird by alfredkayser

Walnut for Thunderbird, based on icons from art.gnome.org, and sporting a wooden look.
Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

ThunderBrowse by GS! Networks

Did your friend send you a cool link? Want to read the rest of that interesting article? Don't want to open up your web browser just to view it? You don't have to! Just view it in Thunderbird with ThunderBrowse!

ThunderBirthDay by ingomueller.net

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Contacts Sidebar by Jeroen Peters

Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.

Visit my Contacts Sidebar site for recent versions and news.

PitchDark for TB by thebankshow

Dark-colored minimalistic theme with emphasis on visibility, usability and maximum screen real estate.

Display Contact Photo by Samuel Mueller

Displays the contact photo/image/picture of the sender/recipient while reading or composing a message. Supports photos in a local folder and the 'Face' header for embedded photos. The add-on adds new generic photos and many styling possibilities.

Sender Name by Takahiro Shinagawa

Exit Button Thunderbird by Mark S Baines

Adds a toolbar button to exit Thunderbird. Go to View menu, Toolbars, Customize... and drag the icon where you want...

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

iLeopard Mail by REO-2007

It is a Theme of the Mac Leopard-style which did iLeopard in a model.

World Weather+ by mrtech

Displays local weather information from around the world...