I noticed some issues rendering some pages in Firefox so I was checking the change log threads and stumbled on this:
https://www.mozilla.org/en-US/firefo.../releasenotes/In advance of removing all trust for Symantec-issued certificates in Firefox 63, a preference was added that allows users to distrust certificates issued by Symantec. To use this preference, go to about:config in the address bar and set the preference "security.pki.distrust_ca_policy" to 2.
It seems a near future update will distrust all cert's issued by Symantec, so just in case anyone is using a cert issued by them you might want to redo the cert's.
Rick
Universal4
(font bolded by me to draw attention to pertinent information)