Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Switch the signature on/off or choose a new one from your predefined set...
Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, Plaxo contacts, and more.
Contact Tabs enhances Thunderbird to give you quick access to all your contacts directly from Thunderbird's main window: Use the powerful search field to find your contacts and open them in a new tab for viewing and editing.
Allows to synchronise Thunderbird's addressbook with external directories/files. Every contact is exported/compared with an external file. Right now, only vCard version 2.1 is supported as export file format.
Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts.
Display birthdays from the Thunderbird addressbooks as events in Lightning.
SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).
Loads Windows Contacts from Windows 7 or Vista in a Thunderbird Address Book called "Windows".
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.
Birthday Reminder reminds of upcoming birthdays for all contacts in Thunderbird's address book. Supports Lightning, reminders and even Google Calendar :-)
This add allow to customize the snooze delay when snooze popup appears (lightning required).
Adds message-specific buttons to Thuderbird that are consistent with the way Gmail handles Trash and Spam.
TB<16 Users - Download here.