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> Neither desktop firefox nor chrome seem to do this by default

they do, you probably just checked the "i'm sure this is safe" button

posted a pic on the imageboard hehe

As your screenshot says, you've enabled HTTPS-Only Mode - that's not the default, though, so most(?) Firefox users don't see that.

Thanks for visiting! Receiving guestbook comments is such a delight. Does Chrome also give you this warning on desktop?

nope