Contacts

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LookOut

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).

Rated 4 out of 5 stars (147)
7,890 weekly downloads

Contact Tabs

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.

Rated 4 out of 5 stars (53)
4,816 weekly downloads

gContactSync

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (213)
4,668 weekly downloads

ReminderFox

ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

Rated 4 out of 5 stars (526)
3,444 weekly downloads

ExQuilla for Microsoft Exchange

Thunderbird email accounts, including contacts, connecting to Microsoft Exchange Web Services. This is a 60 day trial of a paid add-on.

Rated 3 out of 5 stars (92)
2,291 weekly downloads

Cardbook

A new Thunderbird address book based on the CardDAV and VCARD standards.

Rated 4 out of 5 stars (39)
1,080 weekly downloads

Google Contacts

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

Rated 3 out of 5 stars (313)
907 weekly downloads

Zindus

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

Rated 4 out of 5 stars (207)
852 weekly downloads

Addressbooks Synchronizer

Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers

Rated 4 out of 5 stars (57)
654 weekly downloads

Telify

Converts telephone numbers into clickable links for use with CTI applications, SIP clients, Skype, Netmeeting, snom phones, the AGFEO TK-Suite Client and SerVonic IXI-PCS.

Rated 4 out of 5 stars (56)
404 weekly downloads

Auto Address Cleaner

Removes comment, display name automatically from addresses before sending mail.

Rated 5 out of 5 stars (47)
381 weekly downloads

CategoryManager

Category manager for CardDav contacts, also allows to send an email to all members of a category (categories can be used as contact groups).

Rated 5 out of 5 stars (9)
361 weekly downloads

ThunderSync

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.

Rated 4 out of 5 stars (15)
343 weekly downloads

Duplicate Contact Manager

Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts.

Rated 3 out of 5 stars (100)
329 weekly downloads

Contacts Sidebar

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.

Rated 4 out of 5 stars (275)
226 weekly downloads

AddressBookTab

It adds a button that can be put in toolbars and that open the addressbook in a new tab

Rated 4 out of 5 stars (66)
215 weekly downloads

Signature /Auto Paste /Prefill Fourms

Makes everyday entries to forms & forums simpler!
Add a sig. with just a Rclick of the mouse and select 'Add Sig.' from the context menu.
(Please, note: What you see in the pic is only an example. ThoseRMine Sorry, you have to make your own tabs. )

Rated 4 out of 5 stars (24)
205 weekly downloads

ThunderBirthDay

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Rated 4 out of 5 stars (85)
197 weekly downloads

Display Contact Photo

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.

Rated 4 out of 5 stars (103)
186 weekly downloads

EMail Address Crawler

Automatically fill your address books or send mass mails with e-mail addresses extracted from all your e-mails.

Rated 4 out of 5 stars (92)
181 weekly downloads