Top-Rated Extensions

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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 (143)
26,091 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 (26)
5,591 users

Provider for Exchange ActiveSync Requires Restart

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

Rated 5 out of 5 stars (13)
20,577 users

DeepDark for Thunderbird Requires Restart Featured

Dark mode for Thunderbird UI

Rated 5 out of 5 stars (30)
10,255 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 (12)
2,893 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)
449 users

Grammalecte [fr] (for Thunderbird) Requires Restart

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

Rated 5 out of 5 stars (10)
4,727 users

Close tab on ESC Requires Restart

Closes a Mozilla Thunderbird tab when pressing the Escape key.

Rated 5 out of 5 stars (56)
418 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)
59 users

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (14)
28 users

Phoenity Icons Requires Restart

Phoenity icons for Thunderbird

Rated 5 out of 5 stars (8)
4,666 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 (24)
12,381 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 (13)
4,831 users

Send and File Requires Restart

Allows to file outgoing messages in folder you prefer

Rated 5 out of 5 stars (18)
67 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)
8 users

No Message Pane Sort Requires Restart

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 (33)
2,552 users

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (27)
458 users

Edit Email Subject Requires Restart

Edit Email Subject for Thunderbird

Rated 5 out of 5 stars (16)
1,620 users

Get Selected Mails Requires Restart

Gets new messages for selected mail accounts.

Rated 5 out of 5 stars (11)
220 users

TbSync Requires Restart

TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.

Rated 5 out of 5 stars (96)
45,449 users