Recently Updated Extensions
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.
Send Later Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
Spanish (Mexico) spell checker dictionary
quickFilters Requires Restart
Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.
By popular demand, supports SORTING filters alphabetically.
Confirm-Address Requires Restart
Confirm E-mail address before sending mail
SmartTemplate4 Requires Restart
SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Adds two columns to the list of mails. One shows an indicator wether a mail is incoming or outgoing, the other shows the sender or the recipient of the mail respectively...
QuickFolders (Tabbed Folders) Requires Restart
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
LookOut (fix version) Requires Restart
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).
Support: Thunderbird and SeaMonkey
ThunderBirthDay Requires Restart
Display birthdays from the Thunderbird addressbooks as events in Lightning.
Highlighter Requires Restart
Quickly highlight some text in Thunderbird message composing windows.
Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.
FiltaQuilla Requires Restart
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
Join-NG Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
Show contact photo and other info from Local Dir, Addressbook, LDAP, Facebook, LinkedIn, Flickr, Gravatar etc
Display Mail User Agent Requires Restart
Displays icon for user agent of received mails.
Enhanced Priority Display Requires Restart
Enhanced thread pane display of message priorities.
IMAP Received Date Requires Restart
Make the “Received” column in IMAP folders show when messages were actually received.