Add-ons

Enigmail by Patrick Brunschwig

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

Dizionario italiano by flod

Add support for Italian to spellchecking

Mail Redirect by Onno Ekker, Pawel Krzesniak

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

British English Dictionary by Mark Tyndall

British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.

To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".

Addressbooks Synchronizer by Günter Gersdorf

Synchronizes selected addressbooks with other instances of thunderbird
using local files, webdav servers or imap servers

MinimizeToTray by Mook, Brad Peterson

Minimizes Mozilla windows into the system tray. Also includes a right clickable tray icon menu to further load only the windows you want visible...

AutoCopy by Autocopy, Michael Lidman

Select text and it's automatically copied to the clipboard. Also pastes on middle click.

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!

Thunderbird Message Filter Import/Export by Wind Li

Thunderbird Message Filter Import/Export is a thunderbird/mozilla extension to import/export message filters.

ThunderBirthDay by ingomueller.net

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Collector's Note installare anche MoreFunctionsForAddressBook: https://nic-nac-project.org/~kaosmos/morecols.html ...ed ovviamente anche Lightning che è presente in questa raccolta...

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.

accountex by Michael Otto

Export/Import Account Settings.....

Collector's Note Questo invece per fare un backup delle e-mail: http://www.extenzilla.org/scheda_estensione.php?id=239

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

CuteMenus - Crystal SVG by mrtech, Static_Nexus, others

Note from Mozilla: This add-on has been discontinued. Try Menu Icons Plus instead.

Adds icons to all menus along with some other features...