Forum Response - Websites will not load after Firefox update

If you're having website connection issues after a Firefox update, your third-party antivirus software, such as Avast, might be interfering with Firefox's secure connections.

We recommend that you uninstall your third-party antivirus software and use the security software offered for Windows by Microsoft:

• Windows Security with Microsoft Defender Antivirus (built-in)

For more information and other solutions, see Troubleshoot security error codes on secure websites.