IMEStatus Requires Restart
Show IME status by input/textarea/textbox background color.
EzStylist Requires Restart
Allows including CSS when composing e-mails.
Extension Test Requires Restart
A simple add-on for extension testers, especially AMO editors and developers who plan to submit their add-ons to AMO.
NuevaSync Push Email Synchronization Requires Restart
NuevaSync provides push sync services for email and more for iPhone, Android, and other smartphones. This add-on displays real-time sync status in the Thunderbird status bar, and offers easy NuevaSync account setup using your Thunderbird settings.
Mail Sent Notifier Requires Restart
Allows to notify a HTTP-GET based webservice after successfully sent an email, e.g. for time registration systems.
Message Pane Button Requires Restart
A Message Pane Button for Thunderbird Toolbar.
Signature Fixer Requires Restart
Fixes the Signature Stacking bug for Forwards/Replies.
Search in all your search engines at the same time
Adds buttons to open and manage the find bar.
List addons in Windows' "Add or Remove Programs".
Timestamp Requires Restart
Inserts the current date/time into a message or an input field in the browser.
Visit my Timestamp site for recent versions and news.
Edit HTML Source Requires Restart
You can now edit the HTML source in the Compose...
Fast Mail Redirect Requires Restart
Allows the fast redirection of emails...
Orb VideoMail Requires Restart
Toolbar button for creating videomails OF ANY LENGTH right from within Thunderbird. This is videomail freed from attachments!
World Weather+ Requires Restart
Displays local weather information from around the world...
about:kittens Requires Restart
Baby cats and kittens in the about box...
Disable Folder Drag Button Requires Restart
Add Disable-Folder-Drag button.
Colorify Unread Watched NNTP Requires Restart
Colorizes names of newsgroups that have watched threads with unread messages.
Status-Bar Custom Buttons Requires Restart
Create your own status-bar buttons.