Privacy and Security

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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
68 users

Logout Requires Restart

This extension adds "Logout" to the folders context menu.
After you "Logout" you will be asked again for passwords for this account (incoming and outgoing).

Rated 5 out of 5 stars (1)
67 users

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)
62 users

Check Attachment before Send Requires Restart

Confirms to send a mail with any attachment.

Not yet rated
53 users

EuropeanMX Spam Reporter Requires Restart

Train your EuropeanMX filter by reporting unrecognized spam or false-positives back to us.

Not yet rated
51 users

Spoof Detector Requires Restart

Extension for Email Spoofing Detection

Rated 2 out of 5 stars (1)
50 users

Auto Password Registerer Requires Restart

Registers given passwords to Firefox/Thunderbird's password manager automatically.

Rated 5 out of 5 stars (1)
46 users

CapsKiller Requires Restart

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

Rated 5 out of 5 stars (2)
44 users

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)
36 users

Bork Bork Bork! Requires Restart

The Swedish Chef travesty filter and URL blocker. View web pages or mail as spoken by the Swedish Chef like this...

"Zee Svedeesh Cheff trefesty feelter und URL blucker. Feeoo veb peges oor meeel es spukee by zee Svedeesh Cheff leeke-a thees."

Rated 4 out of 5 stars (30)
27 users

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 5 out of 5 stars (4)
24 users

PennyPost Requires Restart

This extension makes it very easy to generate and attach stamps to outgoing mail. It also automatically detects and verifies stamps on incoming emails. The MBound algorithm requires a 16MB fixed table to work, HashCash is more CPU intense.

Rated 5 out of 5 stars (3)
24 users

Request Assistant Requires Restart

Currently logs all URLs accessed by the app (into app console & into standard output stream (using dump()), whether the request is explicitly made by the user or automatically made by the app itself.

Not yet rated
22 users

pass-manager Requires Restart

Replace integrated password managers storage with zx2c4's pass (www.passwordstore.org)

Rated 3 out of 5 stars (1)
21 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
19 users

Sender Verification Anti-Phishing Extension Requires Restart

Protects you from phishing attacks by verifying the From: address domain name of emails as you read them. Sender Policy Framework (SPF) and DNS-based reputation lists are used.

Rated 4 out of 5 stars (20)
17 users

Force Authentication at Startup. Requires Restart

Always ask password and hide UI at the startup.

Rated 5 out of 5 stars (1)
17 users

Don't Send Linked Files Requires Restart

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

Rated 1 out of 5 stars (1)
16 users

Habu Requires Restart

*This extension was formerly known as Okopipi*

Please be sure to visit the homepage and forums to provide your input for the future of Habu.

Support can be found at http://forums.mosinu.com/viewforum.php?f=5

Rated 4 out of 5 stars (18)
15 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)
14 users