Dear Pernaman,

Could be an alert for the lacking security of that connection.
The IP 52.222.174.189 has been known to lauch particular adware, blocked by Adguard etc.
Here I find nothing flagged: http://urlquery.net/report.php?id=1496765181020

When you come across alerts because of the new https/http policy for insecure connection,
such an alert does not say anything about the security status of the website an sich.

A whole lot of people now have come to misinterprete such alerts,
and Google nor firefox for that matter should have explained these particulars to their users.
So there has been a new interpretation of the so-called “green padlock”.
What does the average user know?

What does the secure connection to a site bring you, when a free certificate has been installed as root, and we find issues in the HTTPS Only Atlas for that domain or in the crypto report. :o
I think this is pure esthetics, cosmetic and misleading to end-users as they do not value such information right,
as some-one with relevant knowledge would.

polonus (volunteer website security analyst and website error-hunter)