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HTTPS Secure Site Not Available

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Time and time again i come across websites that show a https only mode alert. When i klick to connect anyway, the connection DOES show https instead of http in the adressbar. How does this work? I do remember that previously (might already be over a year ago) when visiting http websites the connection is the adressbar shows http and not https, with a red color and warning icon saying that the site doesn't support https, but now as already said the connection becomes https even when the alert clearly said https isn't available.

Time and time again i come across websites that show a https only mode alert. When i klick to connect anyway, the connection DOES show https instead of http in the adressbar. How does this work? I do remember that previously (might already be over a year ago) when visiting http websites the connection is the adressbar shows http and not https, with a red color and warning icon saying that the site doesn't support https, but now as already said the connection becomes https even when the alert clearly said https isn't available.
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I do have enabled the httpsonlymode in all windows in firefox settings.