If you browse to https://blog.stackoverflow.com/ you see a certificate error.
In Chrome:
This server could not prove that it is blog.stackoverflow.com; its security certificate is from ssl4245.cloudflare.com. This may be caused by a misconfiguration or an attacker intercepting your connection.
In Firefox:
The certificate is only valid for the following names: ssl4245.cloudflare.com, *.redditmedia.com, redditmedia.com, trzi30ic.com, *.trzi30ic.com, reddit.com, *.kmylvwo5.com, foodpanda.com.br, *.reddit.com, *.foodpanda.com.br, kmylvwo5.com
What a bizarre list of websites! I know Reddit, and foodpanda.com.br is presumably a Brazilian site, but trzi30ic.com and kmylvwo5.com sound downright suspicious.
Why do these websites share a certificate? I can't believe Foodpanda has any relation to Reddit.
Screenshot: https://i.stack.imgur.com/fNKqg.png
