I had no problems until I refreshed Firefox. Example: Website address I try to access "https://www.google.com/" 

I couldn't find an add on extension in customization, and the suggestion was to "refresh" Firefox. I did that, but now I cannot open any websites at all. It says that every single site is insecure. I have tried every suggestion I could find to fix it, but nothing works. I tried the Avast fix, but that wasn't the problem. The time, date, etc are correct. Reinstalling doesn't work. Trying to force it to accept the certificate doesn't work. I tried that TSSL route and the max is already set at "3". I had no problems until I refreshed Firefox. Example: Website address I try to access "https://www.google.com/" And this is what I get... 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.