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Re:The majority of Facebook's traffic now uses QUIC and HTTP/3 by sergeykish on Wednesday October 21, 2020 @03:10PM (#24851007)
Essentially it is

    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.

Re:The majority of Facebook's traffic now uses QUIC and HTTP/3 by anon84598 on Wednesday October 21, 2020 @04:37PM (#24851908)
If that's it, you could just save it as a bookmark:

    javascript:alert(performance.getEntriesByType("navigation")[0].nextHopProtocol)
Re:The majority of Facebook's traffic now uses QUIC and HTTP/3 by voltagex_ on Thursday October 22, 2020 @12:30AM (#24854885)
That works in Firefox, too.