Up & Coming Extensions

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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 (243)
2,535 users

Subject Cleaner Requires Restart

Remove extra strings from the subject while composing the message.

Rated 5 out of 5 stars (2)
1,049 users

CALDAV - Search/Subscribe Requires Restart

Add CalDAV search & subscribe feature to Lightning

Rated 3 out of 5 stars (16)
1,072 users

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 5 out of 5 stars (50)
1,826 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 (23)
10,300 users

Ruler Bar Requires Restart

This appends a ruler to the mail composition window.

Rated 4 out of 5 stars (8)
1,702 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 4 out of 5 stars (16)
3,720 users

Flex Confirm Mail Requires Restart

Confirm mail address and attachments based on flexible rules.

Rated 3 out of 5 stars (5)
15,940 users

List Addons in Windows' Programs

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

Not yet rated
2,056 users

Check and Send Requires Restart

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

Rated 4 out of 5 stars (31)
16,803 users

Auto Address Cleaner Requires Restart

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

Rated 5 out of 5 stars (54)
3,433 users

Join-NG Requires Restart

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

Rated 5 out of 5 stars (4)
2,604 users

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 4 out of 5 stars (29)
3,432 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 (6)
1,639 users

Address Close Button Requires Restart

Adds a Address Close Button to mail compose window.

Rated 5 out of 5 stars (25)
2,896 users

Address Move Button Requires Restart

Allow you to add a Address Move Button to mail compose window.

Rated 5 out of 5 stars (2)
3,070 users

Confirm-Address Requires Restart

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (53)
23,250 users