Top-Rated Extensions

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Single Domain Requires Restart

Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.

Rated 5 out of 5 stars (1)
259 users

FileRun for Filelink Requires Restart

Add FileRun support to Thunderbird's Filelink feature.

Rated 5 out of 5 stars (1)
178 users

HtmlHighlightr Requires Restart

Provides source code highlighting in editor's "Insert HTML" dialog.

Rated 5 out of 5 stars (1)
131 users

SenderFace Requires Restart

SenderFace enables you to associate images (faces) with Email senders (from...

Rated 3 out of 5 stars (10)
115 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 (12)
1,693 users

Attachment Manager Requires Restart

An extension to manage attachments across multiple emails.

Rated 3 out of 5 stars (6)
83 users

Opacus SugarCRM (5.5 to 6.1) Professional Requires Restart

Enables archiving of emails into SugarCRM (v5.5 to v6.1) from Thunderbird. Important: This add-on requires a licence key (request a trial from within the extension). Please visit http://www.opacus.co.uk/opacus-thunderbird-extensions for details.

Rated 3 out of 5 stars (4)
104 users

Resize Header Requires Restart

An addon to let you resize the message header pane.

Rated 3 out of 5 stars (4)
337 users

Filter Button Thunderbird Requires Restart

Adds a button to run...

Rated 3 out of 5 stars (14)
521 users

ltnPlus Requires Restart

Version 0.9:
Support printing of tasks for Lightning 0.8/0.9.

Up to version 0.2:
Enhancements to Lightning that are known from Sunbird: Unifinder (for events and todos) and moving MiniMonth to Tabpanel

Rated 3 out of 5 stars (8)
24 users

Tidybird Requires Restart

Organize email into folders quickly and easily.

Rated 3 out of 5 stars (5)
367 users

GNOME keyring password integration Requires Restart

Extension that allows Firefox and Thunderbird to store passwords in Keyring, Gnome's default password store.

Rated 3 out of 5 stars (17)
475 users

TheRealURL Requires Restart

Get URL information: expand short URLs, get title and content type information without visiting the site.

UPDATE, AUG 2013: THIS EXTENSION IS NO LONGER SUPPORTED. The source is open - if you wish to take on the development, you're welcome.

Rated 3 out of 5 stars (7)
438 users

SmartFilters Requires Restart

Tired of writing a lot of filters? Install SmartFilters now to organise your mailbox automatically. It can sort out your mailing lists and robot emails.

Rated 3 out of 5 stars (3)
180 users

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.

Rated 3 out of 5 stars (3)
42 users

JS Deminifier

Simple JavaScript deminifier

Rated 3 out of 5 stars (3)
99 users

Event-to-task conversion activator Requires Restart

Activates the Event-Task conversion ability...

Rated 3 out of 5 stars (3)
16 users

MozLab Requires Restart

Remote shell and test-driven development tool for Mozilla developers

Rated 3 out of 5 stars (3)
2 users

Tb AutoSave Extension Requires Restart

You can now autosave messages from TB upon...

Rated 3 out of 5 stars (3)
77 users

EmailPicky 4 Requires Restart

Grab email addresses from emails from any selected Email Folder and add them to your contacts. (Email Crawler / Email ID Grabber / Bounced email collector) - Thunderbird Plugin
Note: It doesn't create duplicates, but shows as 'xxx messages added'.

Rated 3 out of 5 stars (12)
5,625 users