Up & Coming Extensions

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Restartless Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 4 out of 5 stars (216)
24,105 users

Return Receipt Toolbar Button Requires Restart

Allow you to add a Return Receipt button to mail compose window toolbar.

Rated 5 out of 5 stars (9)
6,105 users

Lightning Month Tabs Requires Restart

This addon adds month tabs into Lightning calendar month view

Rated 5 out of 5 stars (8)
9,542 users

SmilieInserter Plus Requires Restart

Insert smilies in messages.

Rated 5 out of 5 stars (18)
3,453 users

OutlookAlike BETA Requires Restart

Makes Thunderbird looking like Outlook.

Rated 4 out of 5 stars (29)
4,474 users

Mnenhy Requires Restart

The primary goal of the Mnenhy project is to make some enhancements to SeaMonkey MailNews/Thunderbird, since there're still plenty of comfort functions missing if compared to Netscape 4.x and other mail and news clients.

Rated 4 out of 5 stars (41)
2,838 users

Folder Filters Button Requires Restart

Just a very simple add-on that adds a toolbar button to execute the "Run Filters on Folders" from Tools menu.

Rated 5 out of 5 stars (19)
3,751 users

Free/Busy Requires Restart

Publish free/busy calendar file (*.ifb) via ftp or to a file. View other people's free/busy info in meeting organizer window. Integrate Thunderbird and Outlook calendars without Exchange server.

Rated 3 out of 5 stars (10)
1,495 users

Google Tasks Sync Requires Restart

Manage your tasks from Thunderbird, even while offline.

Rated 4 out of 5 stars (76)
18,201 users

Track your shipment Requires Restart

Link to tracking sites. (mainly Japanese companies)

Rated 3 out of 5 stars (5)
1,875 users

Muttator Requires Restart

Make Thunderbird behave like Vim

Rated 5 out of 5 stars (18)
1,143 users

Account Colors Requires Restart

Associates user-defined colors with accounts and identities. Applies these colors to accounts, identities, folders, message list, message headers and compose headers. Users will always know which accounts/identities they are working with.

Rated 4 out of 5 stars (94)
11,998 users

Exit Button Thunderbird Requires Restart

Adds a toolbar button to exit Thunderbird. Go to View menu, Toolbars, Customize... and drag the icon where you want...

Rated 3 out of 5 stars (9)
1,278 users

Dict

Looks up the definition of words on a Web page.

Rated 5 out of 5 stars (14)
1,108 users

Zombie Keys (Multilanguage Keyboard) Requires Restart

Enter accents, diacritics, diaeresis, umlauts, ligatures etc. with keyboards of various countries (us,uk,ie,fr,it,ru,de,sv) - via easy to remember shortcuts or menu. Also supports all textboxes of the application (such as search, filters).

Rated 5 out of 5 stars (22)
1,308 users

Bird Import Requires Restart

The extension allows to import e-mail messages from The Bat! mail client into Thunderbird.

Rated 3 out of 5 stars (8)
1,372 users

LocalFolder Requires Restart

Add as many local folders as you want to (like outlook PST).
NB. It doesn't import PST files.

Rated 4 out of 5 stars (11)
9,547 users

OpenSearch Requires Restart

OpenSearch is a Mozilla Messaging addon that will allow you to search the web from within Thunderbird.

Rated 3 out of 5 stars (8)
1,512 users

Email signature for Thunderbird - WiseStamp Requires Restart

Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more

Rated 4 out of 5 stars (2)
4,426 users

Free Memory Button

Free unused memory that Firefox is currently using.

Rated 4 out of 5 stars (6)
7,243 users