Add-ons

Provider for Google Calendar by Philipp Kewisch

Allows bidirectional access to Google Calendar

Remove Duplicate Messages by Eyal Rozenberg

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

FireTray by Foudil, Francesco S., others

A system tray extension for Linux and Windows, allowing to set up custom icon, hiding to tray instead of closing, display the number of unread messages in mailing applications, and other features ...

StartupMaster by htamas

Asks for the master password at startup (fixes multiple password prompt)

Google Contacts by H.Ogi

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

Quote Colors by Malte Ruecker

Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.

Zindus by Leni Mayo

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

SendVia by double-six

Sometimes you need to select a specific SMTP server for sending the current message? Then SendVia is for you.

SendVia provides the `Send' button of message composition windows with a drop-down menu from which you can select or create the SMTP server...

ligtning by lamaboy4