Up & Coming Extensions

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Address Move Button

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

Not yet rated
4,286 users

Custom Address Sidebar

Allow you to help address sidebar more useful.

Rated 4 out of 5 stars (6)
6,153 users

Check Domain

This extension is to display the warning dialog when you send mail for multiple domains.

Rated 4 out of 5 stars (5)
2,543 users

confirm-mail

メール送信前に宛先メールアドレスと添付ファイル名を確認することができるアドオンです。

Rated 3 out of 5 stars (5)
3,005 users

ALL To CC BCC

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)
1,125 users

Address Close Button

Adds a Address Close Button to mail compose window.

Rated 5 out of 5 stars (25)
14,081 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (32)
54,420 users

AutoConfiguration Hook

Provides ability to create E-mail accounts for specific ISP via the account creation wizard.

Not yet rated
5,135 users

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 1 out of 5 stars (1)
8,981 users

MarkSubfolders New

Mark all read for Subfolders

It's the same like MarkSubfolders but it's compatible with Firefox 4 and later.

Rated 5 out of 5 stars (1)
1,132 users

bulkPaste_recipient

May be send an email to have your work routine.
Mail Settings (To / Cc / Bcc / Return / Subject) etc.

This extension is by creating a simple formatting, you can complete the address written in two steps

Rated 4 out of 5 stars (2)
1,205 users

Any Confirmation Message before Send

You can set Any Confirmation Message before Send.

Rated 4 out of 5 stars (3)
1,053 users

Keyword Highlight

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

Rated 4 out of 5 stars (20)
4,292 users

Address bulk copy (アドレス一括コピー)

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)
1,841 users

Auto Address Cleaner

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

Rated 4 out of 5 stars (49)
17,864 users

IMAP Quota (Free Space)

This Thunderbird addon let you customize the behaiour of the IMAP quota statusbar panel.

Not yet rated
1,899 users

Secure Addressing

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 (16)
2,557 users

Join-NG

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

Rated 5 out of 5 stars (2)
2,212 users

GPO support For Firefox and Thunderbird No Restart

Firefox and Thunderbird extension to manage user preferences and user profile CA certificates using GPOs

Rated 4 out of 5 stars (10)
12,585 users

Ruler Bar

This appends a ruler to the mail composition window.

Rated 4 out of 5 stars (8)
2,529 users