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Element Inspector

In the DOM Inspector,quickly navigate to the any elements

Rated 5 out of 5 stars (32)
4,287 users
Updated March 25, 2017

Mail Redirect Requires Restart Featured

Allow to redirect (a.k.a. "remail") mail messages to other recipients.

Rated 4 out of 5 stars (131)
43,075 users
Updated March 24, 2017

Classic Toolbar Buttons

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.

Beta builds on versions page!

Rated 5 out of 5 stars (163)
39,610 users
Updated March 24, 2017

CardBook Requires Restart

A new Thunderbird address book based on the CardDAV and vCard standards.

Twitter: @CardBookAddon
Forum: https://cardbook.6660.eu/

Rated 4 out of 5 stars (102)
11,651 users
Updated March 23, 2017

Theme Font & Size Changer

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 5 out of 5 stars (181)
114,436 users
Updated March 23, 2017

HTTPS Everywhere Requires Restart

Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.

Rated 4 out of 5 stars (143)
346,920 users
Updated March 23, 2017

Open With Requires Restart

Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click. Add Open With to your menus, toolbars and developer toolbox today!

Rated 4 out of 5 stars (189)
23,536 users
Updated March 21, 2017

SendToSecondEmail Requires Restart

This Extension lets you send Mails to both, first and second email address...

Rated 4 out of 5 stars (2)
53 users
Updated March 19, 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 (11)
26,160 users
Updated March 18, 2017

The Adblocker Project

A powerful ad blocker that blocks ALL ads but ads from publishers who shares revenues with targets YOU choose.

Rated 5 out of 5 stars (3)
378 users
Updated March 17, 2017

uBlock Origin

Finally, an efficient blocker. Easy on CPU and memory.

Rated 5 out of 5 stars (997)
3,705,224 users
Updated March 13, 2017

Todo.txt Extension Requires Restart

Thunderbird extension for the Todo.txt application

Rated 4 out of 5 stars (5)
575 users
Updated March 12, 2017

Bamboo Feed Reader Requires Restart

Feed reader | RSS - ATOM - OPML

Rated 4 out of 5 stars (288)
18,041 users
Updated March 12, 2017

Password Exporter

This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Rated 4 out of 5 stars (393)
225,112 users
Updated March 12, 2017

Rspamd-spamness Requires Restart

Rspamd spam filtering system score visualization.

Not yet rated
312 users
Updated March 12, 2017

Blend In Requires Restart

Blends in OS-related values in User-Agent HTTP request header & a number of JS properties, so that Firefox (Thunderbird) appears to sites visited as running on the OS being used the most in the world. Thunderbird can also be blended in as Firefox.

Rated 4 out of 5 stars (10)
1,101 users
Updated March 10, 2017

adaware ad block

By blocking annoying ads and nosy trackers, adaware ad block nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.

Rated 4 out of 5 stars (33)
91,130 users
Updated March 9, 2017

Restart

"Restart" menu and button, with configurable shortcut key.

Rated 5 out of 5 stars (65)
29,569 users
Updated March 9, 2017

Profile Folder Button

Adds profile folder/directory button.

Rated 5 out of 5 stars (1)
1,290 users
Updated March 9, 2017

Menu On Top (SuperMenu Avatar)

Move the Thunderbird menu bar to the top. Choose from a selection of visual styles + colors. Add frequently used bookmarks and an avatar icon without wasting precious screen space. Bookmark your favorite sites, emails, folders or configuration pages.

Rated 5 out of 5 stars (3)
1,437 users
Updated March 9, 2017