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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 (620)
14,803 users

ExQuilla for Exchange

Thunderbird email accounts connecting to Microsoft Exchange Web Services.

Rated 4 out of 5 stars (132)
4,917 users

Remove Duplicate Messages

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Rated 4 out of 5 stars (291)
91,912 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 (164)
16,265 users

Mailbox Alert

Mailbox Alert allows you to specify, for each seperate mail folder, a message, sound and/or a system command that will be executed when new mail is found there. ...

Rated 4 out of 5 stars (179)
1,702 users

Folder Pane View Switcher

Folder view arrows; switch to "All Folders" view when hovering during drag & drop; allow user to select which views are enabled or tied to the view arrows.

Rated 4 out of 5 stars (68)
3,439 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)
2,110 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)
706 users

EnForward

Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).

This function can be invoked by "Forward to Evernote" in the context menu.

Rated 4 out of 5 stars (9)
38 users

Rspamd-spamness

Rspamd spam filtering system score visualization.

Rated 4 out of 5 stars (8)
969 users

Filter Button

Allows to add a button to the message header view toolbar that shows all filters that match the selected message, including manual and disabled filters. A click on the button allows to select a filter to run.

Rated 4 out of 5 stars (25)
777 users

Remote Content By Folder

Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.

Rated 4 out of 5 stars (3)
97 users

Priority Switcher

Change priority of the received messages from the toolbar button and the context menus...

Rated 4 out of 5 stars (26)
109 users

FolderFlags

Allows users to edit the flags Thunderbird sets on folders.

Rated 5 out of 5 stars (24)
3,302 users

New Tab Button

It provide you the following functionalities:
* Open a selected message in a tab by a toolbar button
* Open a message in a tab by double-clicking its header view (disabled by default)
* Hide Lightning's Today Pane on opening a tab

Rated 4 out of 5 stars (9)
885 users

Maximize Message Pane

Maximize message pane by collapsing the thread pane. You can read a message in larger area without opening a new message window...

Rated 4 out of 5 stars (35)
187 users

ToggleReplied

Enables toggling of replied and forwarded states of messages.

Rated 5 out of 5 stars (8)
273 users

mailmindr

Follow up for Thunderbird E-Mails.

Web: https://mailmindr.net/
Twitter: @mailmindr

Rated 4 out of 5 stars (76)
3,122 users

Enhanced Priority Display

Enhanced thread pane display of message priorities.

Rated 5 out of 5 stars (13)
127 users

Colored Diffs

Color diffs sent by SVN/CVS/GIT/Mercurial...

Rated 4 out of 5 stars (20)
539 users