Miscellaneous

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Quote Colors Requires Restart

Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.

Rated 4 out of 5 stars (45)
6,128 users

Join-NG Requires Restart

Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".

Rated 5 out of 5 stars (4)
2,991 users

Send Filter Requires Restart

This add-on allows you run your message filters automatically on outgoing messages after sending. In other words, it's a outgoing filter for thunderbird and seamonkey.

Rated 4 out of 5 stars (37)
3,769 users

Lightning Requires Restart Featured

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Rated 3 out of 5 stars (1,833)
7,142,700 users

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.

Rated 5 out of 5 stars (52)
19,016 users

Mail Redirect Requires Restart

Allow to redirect (a.k.a. "remail") mail messages to other recipients.

Rated 4 out of 5 stars (126)
40,834 users

SyncKolab Requires Restart

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 (http://kolab.org).

Rated 3 out of 5 stars (75)
4,562 users

Highlighter Requires Restart

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (49)
11,268 users

Copy Sent to Current Requires Restart

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

Rated 4 out of 5 stars (67)
3,352 users

Contact Photos Requires Restart

Displays contact photos in the message header.

Rated 4 out of 5 stars (25)
2,669 users

Send Later Requires Restart

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (105)
70,802 users

Clean Subject Requires Restart

"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.

Rated 4 out of 5 stars (39)
3,463 users

Provider for Google Calendar Requires Restart

Allows bidirectional access to Google Calendar

Rated 4 out of 5 stars (956)
356,717 users

CardDAV Browser Requires Restart

A utility to browse vCards stored on a CardDAV server.

Rated 3 out of 5 stars (5)
1,231 users

Toggle Word Wrap Requires Restart

Toggle word wrapping and PRE element wrapping in the message composition and HTML display windows, respectively.

Rated 4 out of 5 stars (44)
5,861 users

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.

Rated 4 out of 5 stars (56)
10,499 users

gContactSync Requires Restart

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 (228)
97,997 users

Year view Requires Restart

Year view for calendar.

Rated 4 out of 5 stars (48)
4,070 users

Lightbird Requires Restart

Standalone calendar UI for Lightning

Rated 4 out of 5 stars (18)
3,315 users

TabSubmit

Lets the user direct the submission of a form to a new tab or window. [Bug #17754]

Rated 5 out of 5 stars (14)
1,550 users