Up & Coming Extensions

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ImportExportTools NG Requires Restart Featured

Adds tools to import/export messages and folders (NextGen)

Rated 5 out of 5 stars (16)
18,147 users

Owl for Exchange

Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird

Rated 5 out of 5 stars (22)
20,576 users

Paranoia Requires Restart

Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)

Rated 4 out of 5 stars (9)
1,714 users

FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 4 out of 5 stars (6)
2,124 users

Encrypt if possible Requires Restart

Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.

Rated 4 out of 5 stars (19)
1,274 users

Grammar Checker Requires Restart Featured

Checks grammar using LanguageTool.

Rated 3 out of 5 stars (13)
5,294 users

Duplicate Contacts Manager Requires Restart

This Thunderbird add-on searches address book(s) for pairs of matching contact entries.
It can automatically delete entries that have equivalent or less information than the other one.
Any remaining matches are presented for manual treatment.

Rated 5 out of 5 stars (10)
5,326 users

mailmindr Requires Restart

Follow up for Thunderbird E-Mails. Lightning or other AddOns are not required. Set a reminder by adding a label or by context menu and let mailmindr remind you.

More information on updates and planned features at https://mailmindr.net/

Rated 4 out of 5 stars (47)
1,316 users

Imap-ACL-Extension Requires Restart

Extension to manage acls/permissions for shared mailboxes/folders on imap servers.

Rated 4 out of 5 stars (12)
2,194 users

URL Link Requires Restart

URL Link is a small Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.

Rated 4 out of 5 stars (1)
2,463 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 (17)
9,176 users

Lightning Invitation Notifier Requires Restart

This extension is an extension to Mozilla Lightning for Thunderbird.
It shows a toast message and opens the invitations window when an invitation arrives.

Rated 4 out of 5 stars (2)
2,227 users

BorderColors D Requires Restart

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.

Rated 4 out of 5 stars (5)
2,059 users

Identity Chooser Requires Restart

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 5 out of 5 stars (99)
7,549 users

ThreadVis Requires Restart

Displays a small graphic visualising the context (thread) of the currently selected email.

Rated 4 out of 5 stars (116)
4,940 users

Send Later Button Requires Restart Featured

A simple button to invoke the (already existing) send later functions.

Rated 4 out of 5 stars (3)
8,409 users

ThunderHTMLedit Requires Restart Featured

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (17)
6,463 users

Provider for CalDAV & CardDAV Requires Restart

This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".

Rated 5 out of 5 stars (13)
12,660 users

Folder Account Requires Restart

Lets you associate user accounts and identities with specific folders. Great for multiple users who share TB, or for managing mailing lists.

Rated 4 out of 5 stars (57)
2,140 users

LocalFolders Requires Restart Featured

Add as many local folders as you want to.
New folders can reside on mapped or network locations.

Works with both TB60 through TB68

Rated 4 out of 5 stars (19)
9,212 users