For Chrome users, this open source extension will tell you what protocol the browser is using for each website being accessed:
https://chrome.google.com/webstore/detail/http-indicator/hgc...
https://chrome.google.com/webstore/detail/http-indicator/hgc...
performance.getEntriesByType("navigation")[0].nextHopProtocol
and background task to update UI, plus a link to chrome://net-export/This one is not hard to audit but in current model should be done by each user.
javascript:alert(performance.getEntriesByType("navigation")[0].nextHopProtocol)