Add-ons

British English Dictionary by Mark Tyndall

British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.

To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".

Image Zoom by Jason Adams

Adds zoom and rotation functionality for images...

Google Contacts by H.Ogi

Access to Google contacts and synchronize them with Thunderbird address books.

Thunderbird Message Filter Import/Export by Wind Li

Thunderbird Message Filter Import/Export is a thunderbird/mozilla extension to import/export message filters.

Zindus by Leni Mayo

Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)

Mark All Read Button by Mark S Baines

Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.

Birthday Reminder by Sebastian Apel

Birthday Reminder reminds of upcoming birthdays for all contacts in Thunderbird's address book. Supports Lightning, reminders and even Google Calendar :-)

Equations by Josh Eads

Insert inline LaTeX equations into e-mail messages.

Collector's Note This is for whom needs to write mathematical equations (personally I find it's really great to have such tool so that I don't have to type those formula or calculations in a messy "code" way)

Allow Empty Subject by Jeroen Peters

Allows Thunderbird to send message without a subject.

Visit my Allow Empty Subject site for recent versions and news.

MR Tech Toolkit by mrtech

(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...

Update Notifier by Todd Long

Note from Mozilla: This add-on has been discontinued. Try Add-on Update Checker instead.

Notifies you when updates are available for your extensions and themes.

Leopard Mail-Default-Aqua by REO-2007

This theme is the skin which can change your Thunderbird like LeopardMail.

Qute for Thunderbird by Artur Meinild

A theme made from the old 1.5 default theme.