Up & Coming Extensions

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Secure Addressing Requires Restart

This add-on provides features to avoid sending emails to wrong addresses. Key features are a confirmation window of recipient's addresses upon sending, name and affiliation look up at mail composition and main windows, and safe auto completion.

Rated 5 out of 5 stars (19)
2,288 users

ThunderHTMLedit Requires Restart

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (3)
1,016 users

Join-NG Requires Restart

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

Rated 5 out of 5 stars (4)
2,205 users

Address bulk copy (アドレス一括コピー) Requires Restart

Thunderbird は Outlook のようにアドレス全選択からの「一括コピー」ができません。
それを実現するためのアドオンです。

Rated 5 out of 5 stars (2)
1,671 users

Address Close Button Requires Restart

Adds a Address Close Button to mail compose window.

Rated 5 out of 5 stars (25)
11,331 users

Auto Address Cleaner Requires Restart

Removes comment, display name automatically from addresses before sending mail.

Rated 4 out of 5 stars (51)
14,710 users

Blinking Alert Requires Restart

Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.

Rated 4 out of 5 stars (27)
10,685 users

Menu Wizard Requires Restart

Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (196)
65,155 users

Personal Level Indicators Requires Restart

Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.

Rated 4 out of 5 stars (12)
2,741 users

withAttach Requires Restart

This extension adds a menu option (and a toolbar button) to compose an email "with attachments"...

Rated 4 out of 5 stars (14)
4,067 users

Imap-ACL-Extension Requires Restart

Extension to manage acls/permissions for shared mailboxes/folders on imap servers.

Rated 5 out of 5 stars (15)
2,324 users

Tag Toolbar Requires Restart

Add toolbar for toggling tags.

Rated 4 out of 5 stars (47)
14,624 users

CardBook Requires Restart

A new Thunderbird address book based on the CardDAV and vCard standards.

Twitter : @CardBookAddon

Rated 4 out of 5 stars (86)
7,086 users

Keyword Highlight Requires Restart

Keywordhighlight changes color/size/weight of your favorite keywords...

Rated 4 out of 5 stars (20)
3,534 users

ALL To CC BCC Requires Restart

送信先アドレスのすべてをTo、CC、BCCに変更するボタンです。
メール作成画面の、件名の下に追加されます。

Rated 4 out of 5 stars (1)
865 users

Priority Switcher Requires Restart

Change priority of the received messages from the toolbar button and the context menus...

Rated 4 out of 5 stars (18)
1,792 users

HTTPS Everywhere Requires Restart

Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.

Rated 4 out of 5 stars (123)
266,589 users

OBM Connector Requires Restart

OBM Lightning Calendar and addressbooks connector

Not yet rated
741 users

Dorando keyconfig Requires Restart

A modified Dorando's addon to rebind keyboard shortcuts. It is designed to be a drop-in replacement, keeping your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) work again!

Rated 5 out of 5 stars (24)
3,147 users

Winmail Opener Bridge Requires Restart

Opens attached winmail.dat by Winmail Opener automatically.

Not yet rated
843 users