Most Popular Extensions
Hide Clear List Button Requires Restart
Hide the "Clear List" Button in the Download Manager.
Sent-By-User column Requires Restart
Adds a new column in message list-view, that will display the name of the user who sent the mail (read from a message header).
Manual configuration required. ONLY FOR THUNDERBIRD.
Custom Alarms Requires Restart
Customize the reminder dropdown in Sunbird and Lightning's event and task dialog.
To configure this extension, open the addon preferences from the addons manager.
Identity Reminder Requires Restart
How many times have you sent out an email and forgotten to set the appropriate email identity? Over and over I send out an email from the wrong address and promise myself I'll never forget again and from now on, I will make sure to set the...
SanRockstar Requires Restart
New Mail Icon Requires Restart
Displays an icon in the system tray when new mail arrives.
SMSalias MozClient Requires Restart
SMSalias is a Firefox/Thunferbird extension that enables you to send SMS messages directly from Browser/email application...
Logout Requires Restart
This extension adds "Logout" to the folders context menu.
After you "Logout" you will be asked again for passwords for this account (incoming and outgoing).
Follow Broken Lotus Notes Links Requires Restart
Fixes the HREF on MASFLOW links in emails from Lotus Notes.
If you dont know what that is you do not need this.
IO.Translator Requires Restart
即时在线汉英互译 - Instant Online Translator (Chinese-English)
Personasizer allows you to expose more of your persona's header image. Useful for personas that have text or an important part of their content cut off by the browser's navigation elements.
Options Toolbar Button Requires Restart
Dialectic Dialer Requires Restart
Dial phone numbers with Dialectic (Dialectic is for OS X only). In addition, when a page loads, phone numbers can optionally be highlighted and hyperlinked to dial Dialectic.
Muestra una notificación cuando se recibe un mensaje de chat.
Kmaleon Extension Requires Restart
Con esta extensión podrás hacer una copia de tus emails en el programa kmaleon.
Reject Button 1.0 Requires Restart
Annoyed by receiving mails with missing or wrong subjects or meaningless message bodies? Simply reject them with the Reject Button Add-On and enforce proper e-mail etiquette at the cost of just a few friendships.
BOINC Stats 2 Requires Restart
Displays your Total and Recent Average Credits for BOINC distributed computing projects in the status bar.
Send to xNode Requires Restart
Sends content to xNode for analysis. Provides information on domain names, IP addresses, eMail addresses, certificates and much more.
S/MIME Security for Multiple Identities Requires Restart
Adds S/MIME Security configuration to the multiple identities dialog.
Meanwhile this feater has been integrated into Thunderbird 3
TB Menubar Unread Notifier Requires Restart
Output the number of unread messages in all inboxes into the temporal file /tmp/testUnread. As a result, this output file can serve as an input for other applications to read and show notification either on a dock bar or on the menubar.