LookOut Featured

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)
1,679 weekly downloads


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 (205)
1,386 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 (47)
837 weekly downloads


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 (498)
724 weekly downloads

ExQuilla for Microsoft Exchange

Thunderbird email accounts, including contacts, connecting to Microsoft Exchange Web Services.

Rated 3 out of 5 stars (86)
698 weekly downloads

Google Contacts

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

Rated 3 out of 5 stars (311)
339 weekly downloads

Contacts Sidebar Featured

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)
292 weekly downloads

Addressbooks Synchronizer

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

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


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)
130 weekly downloads


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 (6)
117 weekly downloads


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

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


VCard Addressbook : a new addressbook for Thunderbird based on the CARDDav and VCARD standards.

Rated 4 out of 5 stars (12)
103 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 (95)
93 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 (90)
86 weekly downloads


Display birthdays from the Thunderbird addressbooks as events in Lightning.

Rated 4 out of 5 stars (84)
82 weekly downloads


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 (65)
76 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 (101)
60 weekly downloads


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 (52)
60 weekly downloads


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 (

Rated 3 out of 5 stars (74)
53 weekly downloads

CALDAV - Search/Subscribe

Add CalDAV search & subscribe feature to Lightning

Rated 2 out of 5 stars (8)
52 weekly downloads