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Full Address Column

Adds a full sender and recipient e-mail column to message list panel.

Rated 5 out of 5 stars (73)
4,979 users

Mark All Read:WE

Mark all read (Web extension) - Adds a toolbar button to mark all unread messages in current folder as read.

*Note*
Version 2: Requires Thunderbird v128+
Version 1: Works best with Thunderbird v91+

Rated 3 out of 5 stars (19)
907 users

Thematic

Quickly switch between your themes or back to the default.

Rated 1 out of 5 stars (1)
450 users

ThunderWebTabs

Opens Google Keep, Google Photos, Android Messages or any other website in Thunderbird's tab.

Users who encounter "Browser not supported errors" should try changing their User Agent. For more details, please visit the "Support site".

Rated 5 out of 5 stars (1)
255 users

Toggle HTML

Adds a Toggle HTML button

Rated 4 out of 5 stars (8)
968 users

Change Link Appearance

Changes the appearance of links when displaying a message

Not yet rated
74 users

Hide Local Folders for TB78++

Removes the 'Local Folders' entry from the folder pane.
(The folder itself will stay existent.)
(Based on the original work of Alex Cabal.)

Rated 5 out of 5 stars (17)
4,212 users

Open Google Tabs

Open up Google Calendar, Notes, and Microsoft Outlook in a new tab.

Not yet rated
86 users

ThunderSuite - Customize your Quick Access Sidebar

This extension allows user editing of the spaces sidebar.
Create custom spaces from the extension options, to turn the new toolbar introduced with Supernova into your personal quick access toolbox.

Rated 5 out of 5 stars (7)
269 users

Last selected message

The add-on remembers the last selected message in visited folders. After restarting Thunderbird, when we enter the previously visited folder, this message will be displayed, just like in Microsoft Outlook.

Rated 3 out of 5 stars (4)
134 users

Two Dynamic Birds

An extension of the "Two Little Birds" and "Dracula" themes that includes a toggle button to turn on dark mode.

The position of the light/dark toggle button can be customised to avoid it covering the cute birds!

Not yet rated
108 users

Old (classic) Icons

This replaces the new monochrome icons with the old/classic colorful icons. Uses the code from Phoenity Icons and the graphics from older Thunderbird versions.

Rated 5 out of 5 stars (29)
2,313 users

Weatherlicious

A dynamic theme based on weather data from OpenWeatherMap.

Rated 4 out of 5 stars (8)
348 users

Topic Tree / Notebook and Wiki in TB

* Keep notes and ideas
* Notes can be styled with images, tables, links, mindmaps etc.
* Full text search
* Copy and paste text/html
* Drag text/html into tree to create new note
* Link notes
* Backup
* Print notes
* Notes for emails: XNote++

Rated 3 out of 5 stars (5)
353 users

Phoenity Icons

Phoenity icons for Thunderbird

Rated 5 out of 5 stars (68)
11,949 users

userChromeJS

Load the contents of chrome/userChrome.js from the user's profile directory every time a window is opened. Also add a toolbar button which reloads userChrome.js in the current window.

Rated 5 out of 5 stars (8)
285 users

Search Button

Toolbar button to invoke message search dialog window.

Rated 5 out of 5 stars (9)
2,430 users

Filter on Folder Button

act. version 1.6.1 for Tb >= 128.x

Toolbar menu button with filter functions.
- run filter on folder
- run filter on message
- show filter dlg
- create filter from message

with hotkeys, theme support, languages de, en, fr, es, it

Rated 4 out of 5 stars (26)
918 users

Eventview

It seems like taskview,
but it would be enough with a small size because event is different to task.

Version 9.7 for Thunderbird version 90s was updated as of 2021-08-04.

Be a light.
I thank God!

Not yet rated
6 users

New Bing Anywhere

New Bing isn't just for Edge anymore. Anywhere you want

Rated 2 out of 5 stars (2)
25 users