This is a Firefox extension that shows in a readable format, the state of HSTS (HTTP Strict Transport Security) and HPKP (HTTP Public Key Pins) domains stored by the browser. Firefox does not have a native way to show these domains or this functionality documented.

The information provided by the table is the one stored by the browser, “translated” in a more human readable way.

- Domain: domain protected under HSTS or HPKP.
- Score: this score is a Firefox value. It increases by one every different day (24 hours at least) the domain is visited.
- Date: last day the domain was visited. It is calculated by Firefox using the number of days since 01/01/70.
- Expiration Date: max-age of HSTS or HPKP, in other words, when the entry will expire.
- SecurityProperty: this is a Firefox value. SecurityPropertyUnset if 0, SecurityPropertySet if 1 or SecurityPropertyKnockout if 2.
- IncludeSubdomains: whether the HSTS or HPKP directive includes subdomains.
- HPKP Pins: list of pins in the HPKP header.

Pin Patrol for Firefox

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