(Please do not reply with any anti-Mac or 'A Mac can't get a virus'[viruses are not the only threat to a computer.> ] comments, they are not needed or wanted. I have a Windows, Android, and Linux device as well tyvm.) I just did a fresh install of my OS, Installed Avast! And Firefox after they were downloaded, I opened Firefox, and was getting certificate errors, I turned off Avast!' S web shield and the problem went away. I did some research and it seems that Avast! Is replacing SSL certificates with their own.

Install Avast Mac Security by clicking the green button below once MacUpdate Desktop is installed on your Mac. How to Remove Avast In this Article: Removing Avast from Windows Removing Avast from Mac OS X Community Q&A Avast Software offers a number of security products for Windows and Mac OS X users that help protect computers against viruses, malware, and other types of security threats.