Review Mozilla 1884921: HTTPS-First should add a temporary exception for sites that it is not able to...

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1884921

Not really sure what this bug changes, but I'm curious how the temporary exception would work with new circuits. E.g. if on one circuit HTTPS fails, and you get the exception, what happens when you try with a new circuit (where HTPPS would succeed).

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