Account Check

Checks account settings against those listed in the Thunderbird autoconfig database and offers to fix settings that don't match. This is the same check performed when setting up an account.

PrettyBlockquote

The add-on ensures that the quoted text in your reply is clearly highlighted with a vertical blue line, even when viewed by recipients using different email clients like Gmail or macOS, by using inline CSS on the blockquote HTML tag.

ChatGPT Addon

Integrates ChatGPT with Thunderbird for quick and easy access to its conversational AI capabilities.

iCanban - Kanban with ICAL

Redo Button

Adds a Redo button to Thunderbird compose toolbar

Undo Button

Adds an Undo button to Thunderbird compose toolbar

j-lawyer.org-Thunderbird-Extension

Sendet E-Mails an einen j-lawyer.org Server

Note: This extension saves messages on a j-Lawyer.org server. Sensitive data may be transmitted. Depending on the type of connection, this data may also be unencrypted.

Tamizha Spellchecker Requires Restart

Tamil spell checker derived from the OpenOffice spell­­­­checker created by Tamizha Team

Uyghur Spelling Dictionary (ئۇيغۇرچە ئىملا لۇغەت)

Uyghurche Imla Lughet ئۇيغۇرچە ئىملا لۇغەت
Enables spell checking in any text field for Uyghur Arabic Alphabet.

ansitel Click-to-Dial

This plugin will call a selected number by clicking the right mouse button.

BorderColors D

Shows a colorful border around the "New Message" window, so you can tell different identities apart.

Builds on the original BorderColors and the "GT" version, adding different border styles.

Console messaging example

Console messaging example add-on

Header Tools Improved

Allows to modify headers and source of messages

Config Button

Adds a Config button, opens about:config in a tab.

BCM Bengali (Bangladesh) Spellchecker

Spellchecker for Bengali (Bangladesh) following Bangla Academy and Prothom Alo standards: See https://banglatypefoundry.com/spellchecker/

Scriptable Notifications

Allows you to define an external script (bash, batch, python, ...) which is called so you can manage mail notifications / alerts the way you want.

Snap/Flatpak versions of Thunderbird not supported.

Search for

Context menu on message allowing quick filtering based on email/sender or domain

Just Report It

Just Report It (https://justreport.it) is an email plugin which tackles spam the right way. Report emails straight to SpamCop, the Registrar, a custom email address or any combination in between!

DS-BCC

Data protection extension, to avoid data mishaps with circular mails:

1. warning for e-mail with multiple recipients not in BCC (exceptions possible)
2. warning for roundmails with a different recipient domain
3. warning if PGP key is present

Attachment Saver

Saves all attachments from multiple selected emails as a single zip file.

It provides an extra option in your context menu when selecting emails.