Seems like that bug only occurs on http sites ( @enterent if I open romanheritage.com it doesn't get upgraded to https - but on your screenshots the scheme is https but still the problem also occurs on that website). Might be related to https://bugzilla.mozilla.org/show_bug.cgi?id=1725402
Bug 1742899 Comment 7 Edit History
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Seems like that bug only occurs on http sites ( @enterent if I open romanheritage.com it doesn't get upgraded to https - but on your screenshots the scheme is https but still the problem also occurs on that website). Might be related to https://bugzilla.mozilla.org/show_bug.cgi?id=1725402 or https://bugzilla.mozilla.org/show_bug.cgi?id=1721448. I will investigate it.