Unfortunately permissions to access everything on every website are way to broad for a niche extension like this. There's no guarantee it won't be sold to a malware developer in a month. If you want to use it, I suggest cloning the repo and loading it as an unpacked extension to avoid auto updates.

Also be sure to audit it yourself beforehand if you're going to go that route; there's no use tilting against auto-updates if you haven't gone to the trouble of making sure that malicious code isn't already present.

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.

If that's it, you could just save it as a bookmark:

    javascript:alert(performance.getEntriesByType("navigation")[0].nextHopProtocol)

That works in Firefox, too.

This is quite timely: https://chris.partridge.tech/2020/extensions-the-next-genera...

Chrome's own developer tools can tell you this easily. Check out the network pane.