Most Popular Extensions

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Provider for Exchange ActiveSync

Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync

Rated 5 out of 5 stars (52)
33,488 users

Lightning Calendar Tabs

Displays tabs which allows quick navigation between time periods in Lightning calendar. All views of calendar are supported. Color of tab texts can be adjusted.

Rated 4 out of 5 stars (23)
29,849 users

Thunderbird Conversations Featured

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

Rated 4 out of 5 stars (549)
26,957 users

AutoarchiveReloaded Featured

Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)

Rated 4 out of 5 stars (25)
26,876 users

PrintingTools NG

PrintingTools NG enables many layout and formatting options for printing messages with header borders, sorting, attachment lists etc. PDF output can be auto named and Page options can ease printer settings.

It is your printing toolbox.

Rated 4 out of 5 stars (38)
25,573 users

Emoji

Add emojis to your e-mails.

Rated 4 out of 5 stars (62)
25,359 users

Addressbooks Synchronizer

Synchronizes selected addressbooks with other instances of thunderbird
using local files, webdav servers or imap servers

Rated 4 out of 5 stars (79)
25,206 users

Open Google Calendar

Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)

Rated 4 out of 5 stars (77)
23,508 users

XNote++ Featured

Persistent sticky notes associated to emails. You can fulltext search with constraints/email them/print/bookmark/copy to clipboard.

If you have a large screen, you can even display the notes outside of TB's main window, so it won't hide anything.

Rated 5 out of 5 stars (125)
23,341 users

DKIM Verifier Featured

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (45)
21,219 users

Check and Send

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

Rated 4 out of 5 stars (49)
20,176 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (73)
20,098 users

Tag Toolbar / Tag Popup

Add toolbar for toggling tags.

Rated 4 out of 5 stars (84)
18,856 users

FlexConfirmMail

Confirm mail address and attachments based on flexible rules.

(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)

Rated 4 out of 5 stars (11)
17,950 users

Addon Compatibility Check for TB 102/TB 115

Checks all installed add-ons for compatibility with Thunderbird 102 (or TB 115) and displays status information on a button in the main toolbar. This button will open a detailed overview, including links to alternatives for abandoned add-ons.

Rated 4 out of 5 stars (10)
17,325 users

CompactHeader Requires Restart

Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.

Rated 5 out of 5 stars (191)
17,323 users

Manually sort folders

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Rated 4 out of 5 stars (612)
17,058 users

Signal Spam

Add simple functions to report spams or phishing to Signal Spam by one click.
The add-on will also alert you if you open a fraudulent e-mail (phishing).

Rated 3 out of 5 stars (161)
17,054 users

gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird and Google Contacts.

Rated 4 out of 5 stars (416)
16,960 users

Phoenity Icons

Phoenity icons for Thunderbird

Rated 5 out of 5 stars (67)
16,278 users