CALDAV - Search/Subscribe Requires Restart
Add CalDAV search & subscribe feature to Lightning
GTG Task Button Requires Restart
Easily transform a page or an e-mail into a GTG task with a single click.
Toodledo Sync Requires Restart
ToodledoSync is an extension that I did for my need of a GTD system using Thunderbird and Toodledo.
IT IS NOT MAINTENED ANYMORE as I do not have any time. I'll give the (ugly) code to anyone willing to maintain it.
Old-style smilies Requires Restart
Reverts the smilies in Thunderbird to those of version 2.
ICS Inspector Requires Restart
Date on Thunderbird Requires Restart
Highlight External Addresses Requires Restart
This extension helps to warn the user when composing a message to a mixed group of people both in and out of the sender's organization. External addresses are highlighted in orange as a reminder.
ALL To CC BCC Requires Restart
Scans hyperlinks in composed messages and alerts if one of the hyperlinks is broken.
Linux Growl Requires Restart
Sends linux notifications using notify-send when a new email or a RSS feed is received.
sudo apt-get install notify-osd
DBus Notifications Requires Restart
Sends DBus notifications when events are detected (a new message is received).
TweeQuilla Twitter for Thunderbird (Obsolete) Requires Restart
Twitter for Thunderbird (Bundle). Provides twitter statuses in the format of email messages, and allows updating Twitter status from Thunderbird.This addon packages the TweeQuilla-app extension with the required "New Account Types" extension.
EzStylist Requires Restart
Allows including CSS when composing e-mails.
Navigation Shortcuts Requires Restart
This extension adds three shortcuts to Thunderbird to navigate more easily.
These shortcuts are: Focus message pane, go one folder up and go one folder down
Directory Contact Tabs Requires Restart
Displays additional information about contacts from LDAP directory servers. The new panels are provided by one or several customized Directory Contact Tabs (Data) add-ons.
Repeat Borders Requires Restart
Adds darker borders to repeat events to distinguish them from single events.
Indian Language Transliterator Requires Restart
Indian Language Transliterator (developed at IIIT Hyderabad, India) is a Mozilla Thunderbird Add-on, developed to enable Thunderbird users to compose and send messages in 10 Regional Indian Languages, using their regular QWERTY keyboard!!!
Mutt Keys Requires Restart
Creates Mutt like key bindings for Thunderbird. Inspired by the mouseless extension.
RtoRe Requires Restart
Erase the R: when reply
This addon adds an entry in the right-click menu which re-threads selected messages together (groups selected messages into the same thread)". This is done by _modifying_ messages; the author of the addon declines any responsibility for data loss.