I restarted Firefox, and it installed version 57. Now, absolutely every site is blocked because Firefox says it's insecure. I cannot go anywhere or do anything with Firefox. Other browsers work without a problem. The previous version of Firefox worked without a problem. I'm using Windows 10, Windows Defender and the Windows Firewall. I don't believe I have any malware installed, and as I said, this only happened after installing version 57. I had to use another browser just to get here to post the issue. Help... Jeff