Certificate Watch is a Firefox add-, can inform you when digital certificates for secure websites are used. When Firefox runs for the first time with this add-on, Certificate Watch reads and records all available root certificates, in CertWatchDB3.sqlite (in your Firefox Profile directory). It can take up to 30 seconds to create the SQLite database.
When you visit a secure website (an https:// website), CertWatch informs you if the certificates have been encountered before or if there are new. New certificates for a website visited before is an indication that something needs careful examination.
You can specify in the Preferences whether you want notifications only for the first time a certificate is encountered, or more times.

Requirements:
* Firefox

The license of this software is Free, you can free download and free use this browser plug-ins software.