Privacy and Security

Subscribe

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. Thunderbird can also be blended in as Firefox.

Rated 4 out of 5 stars (10)
923 users

Paranoia

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

Rated 4 out of 5 stars (6)
845 users

Mailsleuth

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)
821 users

AlertSwitch

Turn on/off the alert shown when new message arrives.

Rated 4 out of 5 stars (3)
816 users

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)
764 users

Export All Certificates

Adds an option to export all root certificates.

Rated 5 out of 5 stars (1)
671 users

abusix Spam reporter

The abusix Spam Reporter enables you to forward and report spam to the abusix blackhole.mx systems directly from Thunderbird (free of charge). Thus, you help professionals and security vendors to fight spam much more effectively at the source.

Rated 4 out of 5 stars (7)
579 users

View Your Certificates Email Address No Restart

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)
579 users

Lock The Text

Encrypt your text data in browser before you submit it to a network

Rated 5 out of 5 stars (11)
578 users

GNOME keyring password integration

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

Rated 3 out of 5 stars (17)
565 users

MailSentry IronPort Spam Reporter

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)
559 users

ThunderBayes

SpamBayes integration for Thunderbird - a better spam filter.

Rated 3 out of 5 stars (15)
520 users

CallingID Link Advisor

CallingID Link Advisor verifies the links you see in Firefox and Thunderbird are safe before you follow them. When the mouse is placed over any link a risk assessment and the full details of the site owner are displayed, helping you evaluate the...

Rated 2 out of 5 stars (10)
503 users

Spamato4Thunderbird

A multi-faceted, collaborative approach against spam.

Rated 2 out of 5 stars (31)
456 users

Element Hiding Helper for Pan No Restart

Help you create element hiding rules for Pan to fight the text ads.

Rated 4 out of 5 stars (3)
439 users

External Email Alert

Alerts user to confirm that it is ok to send an external email.

Rated 3 out of 5 stars (6)
427 users

Security Settings from Address Book

Sets message security (sign/encrypt) when sending or saving messages based on recipients' address book entry's field "Custom1".

Rated 5 out of 5 stars (2)
423 users

CookieFast

A small ergonomic 1-click cookie manager.

Rated 4 out of 5 stars (10)
388 users

Clear IMAP Local Cache

Clears IMAP local cache on startup.

Rated 5 out of 5 stars (1)
357 users

XML Digital Signature Tool

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)
320 users