Categories

Displays negotiated SSL/TLS protocol version and additional security information in the address bar

This Add-on uses the new SecurityInfo-API in Firefox to display information about the transport security used on the sites you visit.

The TLS protocol version is displayed by an icon in the address bar. More detailed information can be viewed by clicking on that icon, particularly to display the TLS protocol version of 3rd party servers that the website you are visiting fetches resources from.