Privacy and Security

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Saved Password Editor

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

Rated 5 out of 5 stars (190)
93,961 users
Updated April 30, 2015

Check Domain

This extension is to display the warning dialog when you send mail for multiple domains.

Rated 4 out of 5 stars (5)
1,608 users
Updated April 22, 2015

Identity Chooser

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

Rated 5 out of 5 stars (90)
8,894 users
Updated April 22, 2015

Mail Merge Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (133)
47,276 users
Updated April 19, 2015

Enigmail Featured

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Rated 4 out of 5 stars (179)
154,873 users
Updated April 18, 2015

ThunderSec

ThunderSec is a security extension that provides several pieces of additional security functionality, including DNS-based Blackhole List (DNSBL), Realtime Blackhole Lists (RBL), DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF).

Not yet rated
22 users
Updated April 15, 2015

CookieFast

A small ergonomic 1-click cookie manager.

Rated 4 out of 5 stars (9)
425 users
Updated April 14, 2015

Force Authentication at Startup.

Always ask password and hide UI at the startup.

Not yet rated
1 user
Updated April 14, 2015

clamdrib LIN

"clamdrib LIN" ist wie der Name schon sagt die Weiterentwicklung des Add-on clamdrib, allerdings nur noch für Linux. Sämtliche E-Mails, Feeds und News werden auf Viren und anderes Ungeziefer geprüft und gemeldet. Gelöscht wird hierbei jedoch nichts!

Not yet rated
75 users
Updated April 12, 2015

FoxyProxy Basic

FoxyProxy Basic is a simple on/off proxy switcher. More advanced features and configuration options are offered by FoxyProxy Standard.

Rated 4 out of 5 stars (27)
28,565 users
Updated April 8, 2015

Blend In

Blends 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 used the most in the world. Since 18.0t17.0.2 Windows is blended in by default too.

Rated 4 out of 5 stars (9)
940 users
Updated April 5, 2015

Bluhell Firewall No Restart

Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.

Rated 5 out of 5 stars (219)
143,011 users
Updated April 3, 2015

Adblock Plus No Restart Featured

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Rated 5 out of 5 stars (4,840)
21,316,223 users
Updated March 31, 2015

CookieKeeper No Restart

Extended Cookie Manager - Keep only wanted cookies.

Rated 4 out of 5 stars (36)
13,046 users
Updated March 31, 2015

Adblock Edge No Restart

Adblock Edge is a fork of the Adblock Plus version 2.1.2 extension for blocking advertisements on the web, without sponsored ads whitelist.

**This addon will be discontinued on June 2015**

Rated 5 out of 5 stars (261)
805,716 users
Updated March 28, 2015

DKIM Verifier

Verifies the DKIM-Signature of an e-mail.

Rated 5 out of 5 stars (9)
2,649 users
Updated March 21, 2015

Pan No Restart

Block ads and manage proxy.

Rated 5 out of 5 stars (42)
1,491 users
Updated March 16, 2015

TorBirdy

This extension configures Thunderbird to make connections over the Tor anonymity network.

Rated 5 out of 5 stars (5)
2,168 users
Updated March 12, 2015

IsAdmin

Shows whether the application is running with admin privileges, using an icon in the status bar; useful if logged in as an administrator and you use privilege limitation tools such as DropMyRights, RunAs or Windows User Account Control.

Rated 5 out of 5 stars (10)
853 users
Updated March 10, 2015

InfoNotary Configurator for Mozilla

Configures Mozilla for work with certificates issued by InfoNotary Plc.

Rated 5 out of 5 stars (2)
10,215 users
Updated January 25, 2015