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Rescue Conflicting Alternatives

Renders conflicting alternative bodies if the message has them.

Not yet rated
38 users

Copy Message ID

Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.

Rated 5 out of 5 stars (3)
311 users

Colored Diffs

Color diffs sent by SVN/CVS/GIT/Mercurial...

Rated 4 out of 5 stars (20)
534 users

Folder Account

Lets you associate user accounts and identities with specific folders. Great for multiple users who share TB, or for managing mailing lists.

Rated 4 out of 5 stars (63)
1,983 users

Evernote Tab

Add a button and a menu to open Evernote in tab.

Rated 3 out of 5 stars (9)
457 users

Toggle Quotes (Collapse Quotes)

Adds a Toggle Quotes button, allows to collapse quotes.

Rated 4 out of 5 stars (1)
137 users

Macro Template

Macro Template is to replace mail templates with macros for date formatting.

Rated 5 out of 5 stars (9)
472 users

iOS IMAP Notes

This addon allows to edit notes iOS notes within TB. The legacy version was mostly based on code derived from the "Header Tools Lite" by Paolo Kaosmos and OPTO. The WebExtension version for TB 115 and later was created with support from John Bieling.

Rated 4 out of 5 stars (11)
181 users

NestedQuote Remover

Remove nested quotes when replying to a mail.

Rated 4 out of 5 stars (13)
1,027 users

Single Domain

Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.

Rated 5 out of 5 stars (4)
95 users

Toggle Headers

Allows to switch between the normal header view and viewing all headers when viewing a message by using a keyboard shortcut (Ctrl+H).

Rated 4 out of 5 stars (12)
1,245 users

Expertspam

Report spam, false-positives or phishing back to your antispam provider.

Rated 2 out of 5 stars (11)
153 users

filemail

Move mails to the same folder where previously mails have been moved from this author by hitting a single key

Rated 4 out of 5 stars (16)
71 users

RemindIt

Help in reminding mails to be answer or sent again. Choose a reminder date for each received or send message that are highlighted in the message list, depending on their status (expired, soon to exprire, to be reminded). Sending a reminder is eased.

Rated 3 out of 5 stars (27)
685 users

Mail Sent Notifier

Allows to notify a HTTP-GET based webservice after successfully sent an email, e.g. for time registration systems.

Not yet rated
58 users

Open With

Open With can open your web links in any browser installed on your computer.

*Open With is no longer maintained.*

Rated 3 out of 5 stars (24)
955 users

URL Link

URL Link is a small Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.

Rated 4 out of 5 stars (6)
2,016 users

Simple Startup Minimizer

This extension will minimize Thunderbird on startup, it is very simple and I didn't put much work into it but it should work on all platforms. Please let me know if you want more features added into it.

Rated 4 out of 5 stars (30)
6,615 users

Smileyfixer

Fixes smileys that show in emails created by Outlook as J.

Rated 5 out of 5 stars (4)
887 users

White Screen

Use white screen test to detect dead pixels, stuck pixels, and other display defects.

Not yet rated
17 users