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Quick Folder Move

When filing messages, a search box will show up allowing you to quickly enter the folder name you want to move to.

If no search term is entered, a list of recent folders will show up instead.

Rated 4 out of 5 stars (194)
7,313 users

Identity Chooser

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 4 out of 5 stars (147)
6,379 users

Attach from Clipboard

Create file attachments directly from the system clipboard.

Rated 4 out of 5 stars (27)
6,466 users

ReFwdFormatter

Remove the ">" prefix from quote when you make a reply.

[Source code] https://github.com/isshiki/ReFwdFormatter

Rated 4 out of 5 stars (15)
2,342 users

List Addons in Windows' Programs

List addons in Windows' "Add or Remove Programs".

Rated 5 out of 5 stars (1)
12,019 users

TexTra

Thunderbirdのメールのテキストを翻訳、辞書引きを行います。

Rated 4 out of 5 stars (2)
751 users

EDS Calendar Integration

Integrates calendars events with Gnome clock applet

Rated 5 out of 5 stars (25)
789 users

LocalFolders

Add as many local folders as you want to.
New folders can reside on mapped or network locations.

Rated 4 out of 5 stars (38)
13,899 users

Correct Identity

Ever sent mail from the wrong email address because you forgot to select the correct identity?

Rated 4 out of 5 stars (119)
2,261 users

Diccionario Ortográfico de Español Colombia

Este diccionario no constituye un diccionario de definiciones sino un diccionario destinado para la corrección ortográfica de Español Colombia (es-CO). Colombian spanish (es-CO) spellchecker.

Rated 5 out of 5 stars (4)
732 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 (54)
4,066 users

WarnAttachment

WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.

Rated 5 out of 5 stars (10)
3,223 users

Unmangle Microsoft ATP Safelinks

Users of outlook.com and o365 who have Advanced Thread Protection enabled will have all URL's in emails changed to redirect them to an Microsoft filter before opening. This is a bad idea.

This plugin will change the URL back to the original value.

Rated 5 out of 5 stars (6)
744 users

Quick Folder Key Navigation

This extension makes it possible to quickly navigate to a particular folder in the folder pane simply by typing the first few letters of the folder name when the folder pane has focus.

Rated 4 out of 5 stars (15)
946 users

EuropeanMX Spam Reporter

Train your EuropeanMX filter by reporting unrecognized spam back to us.

Rated 3 out of 5 stars (3)
223 users

SubSwitch

Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.

Rated 4 out of 5 stars (13)
559 users

Paranoia

Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)

Rated 4 out of 5 stars (14)
669 users

QuickArchiver

Get things done and clean up your inbox! When you move an e-mail the first time, QuickArchiver remembers the destination folder and lets you move more e-mails with a single click. You can apply rules by sender, recipient, and subject.

Rated 4 out of 5 stars (31)
1,146 users

Český slovník kontroly pravopisu (bez diakritiky)

Slovník pro kontrolu pravopisu u textů bez diakritiky pro aplikace Mozilla

Rated 4 out of 5 stars (8)
2,412 users

Copy Sent to Current

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

Rated 4 out of 5 stars (103)
1,813 users