Up & Coming Extensions
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.
Subject Cleaner Requires Restart
Remove extra strings from the subject while composing the message.
CALDAV - Search/Subscribe Requires Restart
Add CalDAV search & subscribe feature to Lightning
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.
Blinking Alert Requires Restart
Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.
Ruler Bar Requires Restart
This appends a ruler to the mail composition window.
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.
List addons in Windows' "Add or Remove Programs".
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
Auto Address Cleaner Requires Restart
Removes comment, display name automatically from addresses before sending mail.
Join-NG Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
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.
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。
Address Close Button Requires Restart
Adds a Address Close Button to mail compose window.
Address Move Button Requires Restart
Allow you to add a Address Move Button to mail compose window.
Confirm-Address Requires Restart
Confirm E-mail address before sending mail