Up & Coming Extensions

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Auto Password Registerer Requires Restart

Registers given passwords to Firefox/Thunderbird's password manager automatically.

Rated 5 out of 5 stars (2)
546 users

UI Text Overrider

Provides ability to override UI elements' label, tooltip text, etc.

Rated 5 out of 5 stars (1)
546 users

globalChrome.css Requires Restart

Provides global user stylesheet.

Not yet rated
553 users

Set Default Columns Requires Restart

Provides ability to set default visibility of columns in the thread pane.

Rated 4 out of 5 stars (3)
567 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 5 out of 5 stars (22)
1,779 users

AddressBook in Tab Requires Restart

Adds a button that can be put in toolbars which opens the addressbook in a new tab like pastismans AddressBookTab

Rated 4 out of 5 stars (20)
4,604 users

Typical Reply Requires Restart

Provides ability to send/receive typical replies in a team.Provides ability to send/receive typical replies in a team.

Not yet rated
2,351 users

PrintingTools Requires Restart

Adds some options to print messages and addressbooks

Rated 4 out of 5 stars (43)
8,180 users

Dark Reader

Dark mode for every email. Take care of your eyes, use dark theme for night and daily messaging.

Rated 4 out of 5 stars (7)
1,630 users

ThunderPEC Requires Restart

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 4 out of 5 stars (34)
1,766 users

Hide Local Folders for TB78++

Removes the 'Local Folders' entry from the folder pane.
(The folder itself will stay existent.)
(Based on the original work of Alex Cabal.)

Rated 5 out of 5 stars (8)
1,043 users

Textmarker

Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)

Rated 5 out of 5 stars (15)
2,857 users

WarnAttachment

WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.

Rated 5 out of 5 stars (8)
2,118 users

Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the help page on how to use and why it sometimes does not work!

Rated 5 out of 5 stars (12)
4,106 users

Stationery Requires Restart

Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!

Rated 4 out of 5 stars (165)
3,317 users

TBDialOut

Place phone calls directly from Thunderbird's address book

Rated 5 out of 5 stars (13)
1,076 users

LookOut (fix version)

LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Support: Thunderbird

Rated 4 out of 5 stars (72)
147,244 users

Folderpane Tools Requires Restart

Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.

Rated 3 out of 5 stars (125)
1,097 users

DeepL Selected Text

Unofficial DeepL translate extension for Thunderbird.

Rated 4 out of 5 stars (4)
1,475 users

tbkeys-lite

Custom Thunderbird keybindings

Rated 5 out of 5 stars (19)
1,103 users