The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
Your browser trusts many certification authorities and intermediate sub-authorities quietly, every time you enter an HTTPS web site. This add-on reveals when certificates are updated, so you can ensure it was a legitimate change.
Displays the current SSL/TLS cipher and certificate chain in the Add-on bar and Site ID dialog
Force-TLS helps you manage sites that must be loaded over HTTPS only. Strict-Transport-Security is built into Firefox, but without a UI; this lets you import/export and manage these settings.
Connect securely to https websites by checking certificates with network notaries. See http://www.perspectives-project.org
Certificate viewer enhancements: PEM format view, file export, trust configuration
Informs you when digital certificates for secure websites are used.
For IT admins who want very much to click through thousands of self-signed certificate warnings and get MitM attacked, this simplifies the process.
Development was discontinued, for details please read "About"
Want an alternative to the centralized certificate authority scheme? This add-on gives you the capability to validate HTTPS-enabled websites via the OpenPGP Web of Trust instead of depending on X.509 certificate authorities!
A extension to notify users when downloading any content from SSL sites issued by harmful authorities.
A simple add-on to provide a modal dialog when the user clicks on a password input field that will transmit insecurely over a non-HTTPS connection. Designed to offer some protection against Man-In-The-Middle attacks like SSL Strip.