Top-Rated Extensions

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DeepDark for Thunderbird Requires Restart Featured

Dark mode for Thunderbird UI

Rated 5 out of 5 stars (35)
10,507 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)
4,409 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)
2,242 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)
388 users

QuickFolders (Tabbed Folders) Requires Restart

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 (155)
20,162 users

Grammalecte [fr] (for Thunderbird)

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

Rated 5 out of 5 stars (11)
4,865 users

Close tab on ESC Requires Restart

Closes a Mozilla Thunderbird tab when pressing the Escape key.

Rated 5 out of 5 stars (58)
374 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 (10)
538 users

Phoenity Icons

Phoenity icons for Thunderbird

Rated 5 out of 5 stars (16)
5,657 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 (9)
56 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 (39)
2,468 users

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (14)
28 users

Send and File Requires Restart

Allows to file outgoing messages in folder you prefer

Rated 5 out of 5 stars (19)
64 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)
6 users

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (27)
442 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 (27)
13,423 users

Provider for Exchange ActiveSync

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

Rated 5 out of 5 stars (17)
22,806 users

Edit Email Subject

Edit Email Subject for Thunderbird

Rated 5 out of 5 stars (16)
1,356 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 (16)
7,892 users

Get Selected Mails Requires Restart

Gets new messages for selected mail accounts.

Rated 5 out of 5 stars (11)
198 users