Privacy and Security

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ShowIP Requires Restart

Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.

Rated 3 out of 5 stars (286)
42,203 users
Updated January 14, 2015

Netlux Adblocker

Block unwanted ads.

Not yet rated
48 users
Updated December 25, 2014

View Your Certificates Email Address

Adds a column for displaying the certificates Email address to the "Your Certificates" tab of the Certificate Manager

Rated 5 out of 5 stars (4)
646 users
Updated July 21, 2014

ToggleFullHeaders Requires Restart

Allows you to customise the message panel buttons to add a "Toggle Headers" button that will switch between showing and hiding the full headers.

Rated 1 out of 5 stars (1)
86 users
Updated February 13, 2014

GNOME keyring password integration Requires Restart

Extension that allows Firefox and Thunderbird to store passwords in Keyring, Gnome's default password store.

Rated 3 out of 5 stars (17)
443 users
Updated January 17, 2014

StartupMaster

Asks for the master password at startup (fixes multiple password prompt)

Rated 4 out of 5 stars (223)
18,319 users
Updated January 4, 2014

Highlight External Addresses Requires Restart

This extension helps to warn the user when composing a message to a mixed group of people both in and out of the sender's organization. External addresses are highlighted in orange as a reminder.

Rated 4 out of 5 stars (1)
181 users
Updated November 10, 2013

MailSentry IronPort Spam Reporter Requires Restart

Report spam and ham to IronPort - originally written for our MailSentry hosted IronPort customers, it can be used by anyone who has their email filtered by an IronPort appliance.

Rated 5 out of 5 stars (2)
543 users
Updated October 28, 2013

Massey Omura Cryptosystem Requires Restart

Add On Keamanan EMail dengan Massey Omura Cryptosystem

Not yet rated
1 user
Updated October 24, 2013

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)
778 users
Updated September 25, 2013

XML Digital Signature Tool Requires Restart

XML Digital Signature Tool is a Firefox add-on for processing Digital Signature in XML documents
(Please read the installation instruction in the "Developer Comments" section before downloading)

Rated 4 out of 5 stars (3)
166 users
Updated September 25, 2013

Channel Guard Requires Restart

Channelguard disables plugins and protocol handlers to ensure maximum security against side-channel attack.

Rated 4 out of 5 stars (2)
43 users
Updated September 9, 2013

Don't Send Linked Files Requires Restart

Prevents sending of linked files if they are file: URLs.

Rated 1 out of 5 stars (1)
19 users
Updated July 11, 2013

Close Proxy Authentication Requires Restart

Provides transparent proxy authentication on your enterprise network.
Close authentication dialog if login on proxy failed.

Rated 5 out of 5 stars (3)
4,259 users
Updated May 23, 2013

Check and Send Requires Restart

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (31)
21,739 users
Updated May 21, 2013

Unsubscribe from Mailing List Requires Restart

Allows recipients to cancel their newsletter subscriptions in the thunderbird interface.

Rated 4 out of 5 stars (13)
1,147 users
Updated May 2, 2013

Encrypt if possible Requires Restart

Sets message security option "encrypt message", if valid X509 certificates are found for all recipients.

Rated 5 out of 5 stars (16)
1,687 users
Updated April 19, 2013

Enigma-code Requires Restart

Proste i szybkie szyfrowanie korespondencji e-mail, jak i dowolnego tekstu. Algorytm szyfrowania oparty na sposobie szyfrowania maszyny Enigma.

Not yet rated
5 users
Updated April 2, 2013

CookieSafe - Control cookie permissions Requires Restart

Control cookie permissions.

Rated 4 out of 5 stars (22)
1,358 users
Updated April 1, 2013

CapsKiller Requires Restart

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

Rated 5 out of 5 stars (2)
64 users
Updated March 11, 2013