Pinning, as implemented by major browsers[1][2], doesn&#x27;t prevent this. Private trust anchors are exempt from key pinning. This is deemed acceptable because in order for the proxy root to be trusted, it would have to be installed on your system, so whoever owns the proxy already has control over your client.<p>If you think that using MitM proxies should be illegal for employers or other organizations providing clients, that&#x27;s probably more of a legal discussion. I don&#x27;t think there&#x27;s necessarily a right to privacy when it comes to internet use at your workplace, as long as all parties are aware of this.<p>[1]: <a href="https:&#x2F;&#x2F;www.chromium.org&#x2F;Home&#x2F;chromium-security&#x2F;security-faq#TOC-How-does-key-pinning-interact-with-local-proxies-and-filters-" rel="nofollow">https:&#x2F;&#x2F;www.chromium.org&#x2F;Home&#x2F;chromium-security&#x2F;security-faq...</a><p>[2]: <a href="https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;SecurityEngineering&#x2F;Public_Key_Pinning#How_to_use_pinning" rel="nofollow">https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;SecurityEngineering&#x2F;Public_Key_Pinn...</a>