No, it isn&#x27;t. Locally installed certificates override pins; if they didn&#x27;t, HPKP browsers wouldn&#x27;t be deployable inside large companies that have regulatory requirements to monitor traffic from their own desktops, and there would be no benefit, because an adversary who can install software or reconfigure your machine can defeat pins in a variety of other less transparent ways.<p>HPKP is great, but it doesn&#x27;t address this problem.