Up & Coming Extensions
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync
Highlighter Requires Restart
Quickly highlight some text in Thunderbird message composing windows.
ThunderBirthDay Requires Restart
Display birthdays from the Thunderbird addressbooks as events in Lightning.
FiltaQuilla Requires Restart
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".
Add Signature Requires Restart
Simply add your signature manually (right mouse click) to your emails
Provides enhanced new mail desktop notifications using the notify-send library.
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.
This add-on offers ui tweaks to improve Thunderbirds appearance (squared tabs, custom tab height, alternative Add-on Manager appearance, compact main toolbars and more).
LDAP Contact Photo Requires Restart
Show contact photo stored in LDAP directory
Confirm-Address Requires Restart
Confirm E-mail address before sending mail
Fixed version (no 90 day timer till silent failure) of the popular "Theme Font & Size Changer for Thunderbird" addon
ReplyWithHeader Requires Restart
Outlook style headers and few goodies for Thunderbird & Postbox.
Join-NG Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
Duplicate Contacts Manager Requires Restart
This add-on searches the given address book(s) for matching contact entries.
It can automatically delete entries that have equivalent or less information than some other one.
Any remaining matches are presented to the user for manual treatment.
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.
Ruler Bar Requires Restart
This appends a ruler to the mail composition window.
G-Hub Lite Requires Restart
Add Google Tabs to Thunderbird! Google services supported by G-Hub Lite: Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need G Suite / Google Apps? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
AdvancedTasks Requires Restart
Thunderbirds Lightning Extension: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.