Check if your ciphered WEB traffic is intercepted

We propose an user-friendly addon that allows you to check if your encrypted web traffic (SSL/TLS) towards secured Internet servers (HTTPS) is not intercepted (being listened to).

To check your https, visit an HTTPS website (like, then click on the gray lock.

Get the extension

Firefox Chrome Opera

Current version : 4.3.0

note: the current version no longer works on Firefox >= 57 (but is still compatible with Firefox ESR).
The API processing SSL certificates is not yet available (GitHub, Bugzilla).
In the meantime, we are working on another solution that will also be compatible with other browsers.