Recently Updated Extensions

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ImportExportTools Requires Restart

Adds some tools to import and export folders and messages

Rated 4 out of 5 stars (187)
429,620 users
Updated Feb. 14, 2018

Identity Chooser Requires Restart

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

Rated 5 out of 5 stars (91)
7,406 users
Updated Jan. 31, 2018

Theme Font & Size Changer for ThunderBird

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Rated 3 out of 5 stars (71)
13,439 users
Updated Jan. 15, 2018

AMO Browsing for SeaMonkey

This extension makes browsing for extensions easier at addons.mozilla.org. It fixes incorrect information about some extensions being not available for SeaMonkey and adds links to the Add-on Converter where needed.

Rated 5 out of 5 stars (6)
223 users
Updated Jan. 3, 2018

Nostalgy Requires Restart

Keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion.

Rated 5 out of 5 stars (146)
7,373 users
Updated Dec. 27, 2017

Enhanced Priority Display Requires Restart

Enhanced thread pane display of message priorities.

Rated 5 out of 5 stars (7)
1,117 users
Updated Dec. 26, 2017

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 5 out of 5 stars (1)
55 users
Updated Dec. 26, 2017

Reply to Multiple Messages

Add menu commands for replying to multiple messages at the same time.

Rated 5 out of 5 stars (3)
408 users
Updated Dec. 26, 2017

CuteButtons

Adds icons to buttons and/or menus.

Rated 4 out of 5 stars (94)
3,899 users
Updated Dec. 9, 2017

Menu Filter

Keep your menus in check by filtering out items you never use.

This extension is not being converted to a WebExtension.

Rated 4 out of 5 stars (50)
2,933 users
Updated Dec. 4, 2017

LookOut (fix version) Requires Restart

LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Support: Thunderbird and SeaMonkey

Rated 4 out of 5 stars (23)
62,091 users
Updated Nov. 29, 2017

Contact Photos Requires Restart

Displays contact photos in the message header.

Rated 4 out of 5 stars (26)
2,472 users
Updated Nov. 23, 2017

gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (244)
83,656 users
Updated Nov. 23, 2017

GNOMErunner Options Requires Restart

Allows to customize GNOMErunner theme

Not yet rated
605 users
Updated Nov. 18, 2017

Caret Out Requires Restart

Disables change of the caret browse mode by shortcut key(F7).

Rated 5 out of 5 stars (4)
167 users
Updated Nov. 3, 2017

Saved Password Editor Requires Restart

Adds the ability to create and edit entries in the password manager.

Rated 5 out of 5 stars (388)
53,880 users
Updated Oct. 31, 2017

DownloadStudio Firefox Integration Requires Restart

Firefox Integration for DownloadStudio

Not yet rated
27 users
Updated Oct. 25, 2017

Dark Background and Light Text (SeaMonkey)

Makes every page to have light text on dark background (exact colors are customizable)

Firefox version is here: https://addons.mozilla.org/firefox/addon/dark-background-light-text/

Rated 5 out of 5 stars (2)
54 users
Updated Oct. 24, 2017

Mouse Gestures Suite Requires Restart

Mouse gestures for SeaMonkey & Firefox: navigate & execute commands using mouse gestures (with single mouse button) and rocker gestures (by pressing 2 mouse buttons). Also: scroll wheel navigation, page scrolling, tab scrolling.

Rated 5 out of 5 stars (61)
8,403 users
Updated Oct. 21, 2017

RequestPolicy Continued

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

Rated 4 out of 5 stars (28)
4,624 users
Updated Oct. 19, 2017