Up & Coming Extensions

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FolderFlags

Allows users to edit the flags Thunderbird sets on folders.

Rated 5 out of 5 stars (14)
2,198 users

List Addons in Windows' Programs

List addons in Windows' "Add or Remove Programs".

Rated 5 out of 5 stars (1)
1,239 users

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 4 out of 5 stars (10)
9,374 users

Typical Reply Requires Restart

Provides ability to send/receive typical replies in a team.Provides ability to send/receive typical replies in a team.

Not yet rated
3,181 users

UI Text Overrider

Provides ability to override UI elements' label, tooltip text, etc.

Rated 5 out of 5 stars (1)
1,713 users

Auto Password Registerer Requires Restart

Registers given passwords to Firefox/Thunderbird's password manager automatically.

Rated 5 out of 5 stars (2)
1,713 users

globalChrome.css Requires Restart

Provides global user stylesheet.

Not yet rated
1,720 users

Set Default Columns Requires Restart

Provides ability to set default visibility of columns in the thread pane.

Rated 4 out of 5 stars (3)
1,735 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 5 out of 5 stars (65)
26,022 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 5 out of 5 stars (22)
2,865 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 (10)
1,638 users

Address Close Button Requires Restart

Adds a Address Close Button to mail compose window.

Rated 5 out of 5 stars (26)
1,645 users

Join-NG Requires Restart

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

Rated 5 out of 5 stars (5)
1,571 users

Check and Send

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (41)
16,836 users

Auto Address Cleaner Requires Restart

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

Rated 5 out of 5 stars (56)
973 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 (29)
1,789 users

Auto Address Cleaner T

Remove comment, display name from addresses before sending mail.

This add-on is a fork of Auto Address Cleaner.
https://addons.thunderbird.net/thunderbird/addon/auto-address-cleaner/

Rated 5 out of 5 stars (4)
5,318 users

Contacts Sidebar Requires Restart

Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.

Visit my Contacts Sidebar site for recent versions and news.

Rated 4 out of 5 stars (244)
1,026 users

ReFwdFormatter

Remove the ">" prefix from quote when you make a reply.

[Source code] https://github.com/isshiki/ReFwdFormatter

Rated 4 out of 5 stars (14)
1,920 users

ThunderPEC Requires Restart

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 4 out of 5 stars (34)
1,964 users