Message Composition

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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 (61)
2,411 users
Updated July 28, 2021

FileLink provider for Send

Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).

Not yet rated
0 users
Updated July 26, 2021

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (233)
63,076 users
Updated July 25, 2021

Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Rated 5 out of 5 stars (195)
64,555 users
Updated July 22, 2021

CategoryManager

Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).

Rated 5 out of 5 stars (15)
7,533 users
Updated July 18, 2021

Markdown Here Revival

A revival of the popular Markdown-Here addon for Thunderbird 78 and beyond.

Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.

Rated 5 out of 5 stars (9)
614 users
Updated July 17, 2021

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 4 out of 5 stars (10)
9,952 users
Updated July 13, 2021

Estimez votre CO₂

Estimez votre CO₂ quand vous rédigez un mail en un simple clic ! Pendant la rédaction de votre mail, cliquez sur l'extension afin de connaître l'émission de CO₂e générée par l'envoi du mail. Vous saurez aussi à combien de kilomètres cela correspond.

Not yet rated
3 users
Updated July 8, 2021

Signature Switch

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (259)
38,671 users
Updated July 7, 2021

Owl for Exchange

Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird

Rated 5 out of 5 stars (92)
34,043 users
Updated June 24, 2021

SmartTemplates Featured

SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.

Rated 5 out of 5 stars (72)
7,888 users
Updated June 17, 2021

*cloud - FileLink for Nextcloud and ownCloud Featured

Upload large attachments to your Cloud and send the link by email

Rated 5 out of 5 stars (24)
12,959 users
Updated June 4, 2021

OpenPGP Alias Updater

Updates the local OpenPGP Alias file from a server to simplify encryption for mailing lists, or email aliases in an organizational environment.

Please make sure config parameter "mail.openpgp.alias_rules_file" is set to "openpgp_alias.json".

Rated 5 out of 5 stars (1)
48 users
Updated May 25, 2021

Toggle Address Box

Adds a Address Box button, toggles the Address Box in the Composer window

Not yet rated
24 users
Updated May 18, 2021

Tulpe

Traffic light protocol extension for Thunderbird, messages are customizable in the option page.

Not yet rated
2 users
Updated May 17, 2021

Limit non-BCC recipients

Check that number of non-BCC recipients does not exceed a parameter.

Rated 5 out of 5 stars (7)
497 users
Updated May 12, 2021

Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the help page on how to use and why it sometimes does not work!

Rated 5 out of 5 stars (15)
5,446 users
Updated May 4, 2021

ThunderHTMLedit

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (29)
16,510 users
Updated April 27, 2021

BorderColors D

Shows a colorful border around the "New Message" window, so you can tell different identities apart.

Builds on the original BorderColors and the "GT" version, adding different border styles.

Rated 4 out of 5 stars (23)
5,055 users
Updated April 18, 2021

Autofile - fast e-mail to folder filing

Read an e-mail, hit Autofile button and it is filed / moved to the right mail folder based on the sender's address. No drag/drop needed.

Autofile can discover folders to store each author mail. Will save you lots of time like defunct filemail.

Rated 2 out of 5 stars (2)
65 users
Updated April 13, 2021