Flexible Identity Requires Restart
Selects an identity based on the recipients list when sending an email
Select Address Book Text Requires Restart
Copy and paste a name, phone number, address or other text from your Thunderbird address book quickly, with just a single menu click.
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
Contacts Sidebar Requires Restart
Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.
Visit my Contacts Sidebar site for recent versions and news.
Eortologio - Greek Namedays Calendar (Thunderbird) Requires Restart
This extension consists of a Greek Orthodox Namedays reminder. It displays in Thunderbird status bar current day's celebrated names.
Display Contact Photo Requires Restart
Displays the contact photo/image/picture of the sender/recipient while reading or composing a message. Supports photos in a local folder and the 'Face' header for embedded photos. The add-on adds new generic photos and many styling possibilities.
LookOut Requires Restart
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Addressbooks Synchronizer Requires Restart
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
AddressBook In Mode ToolBar Requires Restart
Add adressbook button to "mode toolbar" (requires lightning extention)
Windows Contacts Loader Requires Restart
Loads Windows Contacts from Windows 7 or Vista in a Thunderbird Address Book called "Windows".
Security Settings from Address Book Requires Restart
Sets message security (sign/encrypt) when sending or saving messages based on recipients' address book entry's field "Custom1".
Address Cleaner Replying Requires Restart
A display name is erased when an e-mail screen is opened.
Multi-LDAP Requires Restart
Permits to use several LDAP directories simultaneously for address autocompletion.
EMail Address Crawler Requires Restart
Automatically fill your address books or send mass mails with e-mail addresses extracted from all your e-mails.
Zindus Requires Restart
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
tzpush Requires Restart
Z-Sync to Thunderbird Addressbook
Will sync Thunderbird address book to Zentyal, Zarafa, Horde and outlook.com/hotmail.
Show contact photo and other info from Local Dir, Addressbook, LDAP, Facebook, LinkedIn, Flickr, Gravatar etc
mozPod Requires Restart
Sync your address book with an iPod
addressContext Requires Restart
An extension to add addressbook-related options to the context...