What does it mean to insert it &quot;on&quot; a site? I have two dozen tabs open; how should Chrome know that my authentication information should go to the government but not to Hacker News?<p>It seems to me like you necessarily want a custom solution and custom software here; I&#x27;m not understanding how the removal of client-cert support from public builds of Chrome or Firefox would be a problem.<p>(I&#x27;ve never used a CAC, so this might be a dumb question.)