Most Popular Extensions

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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 (186)
15,417 users

DOM Inspector Requires Restart

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

Rated 5 out of 5 stars (78)
15,222 users

FiltaQuilla

Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.

Rated 4 out of 5 stars (99)
14,865 users

FileLink Provider for Box

Uploads your large attachments to your Box instead of sending them by email.

Rated 3 out of 5 stars (12)
14,093 users

Shrunked Image Resizer

Make your photos smaller, so they don't take forever to email.

*Shrunked Image Resizer is no longer maintained.*

Rated 4 out of 5 stars (88)
13,975 users

quickFilters

Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.

By popular demand, supports SORTING filters alphabetically.

Rated 4 out of 5 stars (75)
13,516 users

LocalFolders

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

New 102 version released !

Rated 4 out of 5 stars (38)
13,203 users

Display Mail User Agent T Featured

Displays the mail program with which the selected mail was written

*This addon is compatible with Thunderbird after Web Extesnsions support. Since development and operation check are done on Daily, it may not work on normal Thunderbird.

Rated 5 out of 5 stars (27)
11,224 users

Compact Headers

Limits displayed headers to 1 or 2 lines.

Rated 4 out of 5 stars (67)
10,955 users

uBlock Origin

Finally, an efficient blocker. Easy on CPU and memory. uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc. in your feeds.

Rated 4 out of 5 stars (8)
10,939 users

ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Rated 5 out of 5 stars (86)
10,761 users

Allow HTML Temp

Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).

Rated 4 out of 5 stars (89)
10,538 users

DeepL Selected Text

Unofficial DeepL translate extension for Thunderbird.

Rated 4 out of 5 stars (12)
10,103 users

MyPhoneExplorer

This Addon is needed to sync your Android based smartphone with Thunderbird with the Software "MyPhoneExplorer". You can get MyPhoneExplorer from: https://www.fjsoft.at

Rated 4 out of 5 stars (16)
10,019 users

Dark Reader

Dark mode for every email. Take care of your eyes, use dark theme for night and daily messaging.

Rated 4 out of 5 stars (36)
9,499 users

Auto Address Cleaner T

Remove comment, display name from addresses before sending mail.

This add-on is a fork of Auto Address Cleaner.
https://addons.thunderbird.net/thunderbird/addon/auto-address-cleaner/

Rated 5 out of 5 stars (8)
9,479 users

Google Calendar Tab

Adds a button to open Google Calendar in a new Tab

Rated 4 out of 5 stars (15)
9,293 users

ImportExportTools Requires Restart

Adds some tools to import and export folders and messages

Rated 4 out of 5 stars (250)
9,027 users

Simple Startup Minimizer

This extension will minimize Thunderbird on startup, it is very simple and I didn't put much work into it but it should work on all platforms. Please let me know if you want more features added into it.

Rated 4 out of 5 stars (30)
8,983 users

Google-4-TbSync

This provider add-on adds Google synchronization capabilities to TbSync. Only contacts and contact groups are currently managed, using Google's People API.

Please read the "About this Add-on" section below carefully!

Rated 4 out of 5 stars (56)
8,558 users