Privacy and Security

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Paranoia Requires Restart

Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)

Rated 4 out of 5 stars (9)
1,367 users

Signal Spam Requires Restart

Add simple functions to report spams or phishing to Signal Spam by one click.
The add-on will also alert you if you open a fraudulent e-mail (phishing).

Rated 3 out of 5 stars (50)
10,935 users

Soapy Requires Restart

Bypasses DNS-based censorship

NOTE: This was created as a SOPA protest in 2012. This does not work anymore for most sites. Use Tor instead.

Not yet rated
0 users

Classic Password Editor Requires Restart

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

Rated 4 out of 5 stars (7)
870 users

MDN Extended Requires Restart

Allows the recipient of a message to send a return receipt (MDN: Message Disposition Notification) on message deletion. This addon is usefull for better experience with Notification Viewer addon.

Rated 5 out of 5 stars (1)
1 user

Key Manager Requires Restart

KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation

Rated 3 out of 5 stars (21)
0 users

Disable about:config Requires Restart

Disable about:config feature of Firefox and Thunderbird.

Rated 1 out of 5 stars (1)
12 users

Identity Select Requires Restart

This extension allows you to choose the identity of your new email from a popup menu directly from the Write button. This feature behaves in a similar manner as the Get Mail pulldown menu. In addition, the default behavior of the Write button is...

Rated 4 out of 5 stars (10)
0 users

Silent Block

Minimum and fast URL blocker.

Rated 4 out of 5 stars (31)
208 users

DSN Settings Requires Restart

Adds user interface settings for Delivery Status Notification (DSN) requests. This addon is usefull for settings for Delivery Notification request and better experience with Notification Viewer addon.

Rated 5 out of 5 stars (2)
4 users

Great DANE Requires Restart

Retrieve DANE S/MIME Certificates for Encryption/Signing.

This extension enables users to automatically retrieve S/MIME certificates using the Great DANE Engine (https://github.com/grierforensics/Great-DANE-Engine).

Not yet rated
21 users

KeePass Helper Requires Restart

Adds a hostname, URL, or email account ID to the application's window name (e.g., that of Firefox or Thunderbird) to make it recognizable to password manager utilities like KeePass.

Rated 4 out of 5 stars (40)
60 users

KDE5 Wallet password integration Requires Restart

This extension enable passwords and form logins to be stored in KDE5 Wallet

Rated 4 out of 5 stars (29)
10 users

eelpout Requires Restart

The anti-phish. An informative phishing detection...

Rated 3 out of 5 stars (2)
0 users

Clear IMAP Local Cache Requires Restart

Clears IMAP local cache on startup.

Rated 5 out of 5 stars (1)
168 users

CapsKiller Requires Restart

Caps Killer is a protection against newbies using caps in their mails.

Rated 5 out of 5 stars (2)
6 users

Mailsleuth Requires Restart

Mailsleuth is a add-on for Thunderbird that provides you a full email header analysis of any email in your Inbox. This add-on is designed to provide a report on the email headers on any email you choose from your inbox. MAJOR updates for Feb 2013!

Rated 3 out of 5 stars (7)
98 users

QuickPasswords Requires Restart

Retrieve your Passwords the quick way! Never retype or display your secure passwords on screen anymore - put the password where you need it - the login form or the clipboard.

Now also includes SSO change (multi-domain pw) and Backup + Restore.

Rated 5 out of 5 stars (51)
694 users

No Resource URI Leak

Deny resource:// access to Web content: We fill the hole to defend against fingerprinting. Very important to Firefox privacy. A direct workaround for bugzil.la/863246

Rated 4 out of 5 stars (31)
90 users

S/MIME Security for Multiple Identities Requires Restart

Adds S/MIME Security configuration to the multiple identities dialog.
Meanwhile this feater has been integrated into Thunderbird 3

Rated 5 out of 5 stars (7)
0 users