Problem: Your Connection Is Not Secure Error On Almost All Sites Including Google
You open your Firefox browser and you type "google.com" do start your search and you get the error above. You think to yourself what? google's ssl certificate expired ? not really is your antivirus getting in the way.
I use the Avast free version antivirus although I have nothing but good things to say about this free product I have to say that a lot of time is pushing you too much to upgrade to the "paid" version.
Anyways this error I got while going to google.com:
Your connection is not secure
The owner of www.google.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.
Has to do with your antivirus blocking secure connections.