Top-Rated Extensions

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DeepDark for Thunderbird Requires Restart Featured

Dark mode for Thunderbird UI

Rated 5 out of 5 stars (38)
4,683 users

QuickFolders (Tabbed Folders)

The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.

See new mail at a glance after automatic filtering - supports quickFilters addon!

Rated 5 out of 5 stars (157)
17,777 users

Search Results Sort By Date Not Relevance Requires Restart

Makes search results sort by "date" instead of "relevance" by default.

Rated 5 out of 5 stars (27)
1,607 users

IMAP Received Date Requires Restart

Make the “Received” column in IMAP folders show when messages were actually received.

Rated 5 out of 5 stars (14)
1,004 users

Disable DragAndDrop (Thunderbird) Requires Restart

A Thunderbird extension which disables drag and drop in the folder pane.
This extension prevents unintended folder movement.

Rated 5 out of 5 stars (19)
379 users

Message Header Toolbar Customize

You can change icon display and button order. You can also hide unnecessary buttons.

Rated 5 out of 5 stars (18)
1,885 users

Close tab on ESC Requires Restart

Closes a Mozilla Thunderbird tab when pressing the Escape key.

Rated 5 out of 5 stars (59)
354 users

GlodaQuilla search indexing enhancements Requires Restart

Permits selective enabling and disabling of search indexing on folders or accounts - with inheritence. Also adds three columns to the Thunderbird message pane that are useful in debugging.

Rated 5 out of 5 stars (10)
51 users

No Message Pane Sort

No Message Pane Sort prevents accidental resorting of the message pane by disabling mouse button clicks on the column headers, thus, locking the sorting order of your emails.

It is still possible to sort messages by ctrl-clicking the header.

Rated 5 out of 5 stars (41)
2,070 users

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (14)
33 users

Phoenity Icons

Phoenity icons for Thunderbird

Rated 5 out of 5 stars (31)
8,593 users

Send and File Requires Restart

Allows to file outgoing messages in folder you prefer

Rated 5 out of 5 stars (19)
60 users

*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 (18)
9,458 users

HTitle (discontinued) Requires Restart

Hide title bar if window is maximized.

This add-on has been discontinued!

Legacy extensions support will be dropped in Firefox 57. If you interest in CSD on Linux, please track progress on https://bugzilla.mozilla.org/show_bug.cgi?id=1283299.

Rated 5 out of 5 stars (131)
5 users

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 (28)
14,681 users

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (27)
420 users

Edit Email Subject

Edit Email Subject for Thunderbird

Rated 5 out of 5 stars (17)
450 users

Grammalecte [fr] (for Thunderbird)

French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.

Rated 5 out of 5 stars (12)
4,560 users

Get Selected Mails Requires Restart

Gets new messages for selected mail accounts.

Rated 5 out of 5 stars (11)
189 users

ResetRec Requires Restart

ResetRec allows you to reset the recipient list.

Rated 5 out of 5 stars (6)
383 users