I get this message from my AV :
firefox.exe attempted to connect to blog.pilemaster.ru using an untrusted certificate. We have blocked the connection to protect your data, as untrusted certificates are issued by unrecognised certificate authorities.
Thank you for reporting, we have checked and no such error is showed up while connect to the link which you have posted.
If you still have that error, could you please share us the screenshot of the error for further analysis ?