This is a good change, reducing the incentive to create trusted certs for servers running on loopback. I'm happy to see Mozilla pushing it through!
Intent To Ship @intenttoship
21 Oct 2020
Gecko: Intent to prototype & ship: Treat localhost addresses as "Potentially Trustworthy" groups.google.com/d/msg/mozi…
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Replying to @mikewest
Is this why using Burp and similar proxies don’t work on localhost?

Oct 21, 2020 · 2:27 PM UTC

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Replying to @bilcorry
I'm not familiar enough with Gecko's internals to answer, unfortunately.
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It’s Chrome where it doesn’t work (requires extra effort to configure around the proxy block). Works fine on Firefox, but guessing now that too will need the workaround.
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