Firefox's HTTPS Only mode has uncovered a slew of oddly-broken servers on a lot of big technology companies and none of them have ever replied to me. Smaller outfits, and open source projects? Always get a reply.
@proactiveservices i'm seeing loads of sites getting snagged on this, but eventually when i approve the http workaround, it shows me a https site. haven't dug into it too much to find out what's going on
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