TabAddressbook Requires Restart

Creates a tab for the addressbook.

Expand mailing list recipients Requires Restart

Adds a toolbar button to expand address book lists to its recipients - useful to stripe out some of them when sending mail...

Contact DnD Requires Restart

Enables one to assign a photo to a contact by dragging and dropping it from the local filesystem.

Sender Name Requires Restart

Jabberpresence Requires Restart

This extension has the purpose to verify the presence (online status) of your Jabber IM contacts. Users can add their Jabber accounts (Tools->Jabber Account Setting). A new panel is added in the bottom-left corner, listing contacts presence...

CALDAV - Search/Subscribe Requires Restart

Add CalDAV search & subscribe feature to Lightning

@Contact Mention

This add-on mimics the mentions behavior on Outlook when mentioning a contact with the '@' sign. The contact selected is added as a link in the email body as well as to the recipent list of the email.

Serial Letter Requires Restart

Provides the ability to start writing a template-derived letter directly from within the address book. Supports also multiple recipients. Supports only TeX and similar systems at the moment.

Check Recipients Requires Restart

Checks the existence of email addresses of all recipients in Compose message window from local address books and LDAP directories.

Customizable LDAP AddressBook Auto Complete Requires Restart

Provides (restores) customizability of auto complete items for LDAP addressbook items, and more features.

NotTo Requires Restart

Are you using mailing lists in Thunderbird ?
Do you forward a lot of mail ?

If so, this extension may be useful for you.

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.

Windows Contacts Loader Requires Restart

Lädt Windows .contact und .group Dateien unter Windows7 oder Vista in ein Thunderbird Adressbuch.

EMail Address Crawler Requires Restart

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

CardDAV Browser

A utility to browse vCards stored on a CardDAV server.

This version is only for Thunderbird. There is a SeaMonkey version available if needed.

BirdFon Requires Restart

BirdFon, a lightweight and elegant phone plugin, makes Thunderbird a speaking friend in your online life. With BirdFon you can call your friends in a way similar to the SkypeOut service. The major BirdFon advantage is that it allows you to make...

OpenERP Plugin Requires Restart

OpenERP Thunderbird Integration for version starting from 6.1.

Recently

Recently is a small Mozilla Thunderbird extension for having the most recent contacts at hand

AddressLabel Requires Restart

Create address labels from selected contacts in pdf, odt, ps or html.

Usage
1) Chose settings.
2) In the Address Book, select contacts and right click.
3) Print with "Actual Size" (not "Fit to Page").

SJCall Requires Restart

SJCall is a beta version of a VoIP extension enabling you to place telephone calls directly from the Mozilla applications using SJphone, the world-leading Internet softphone...