Browser video problem, media_error_unknown, ssl_error_rx_record_too_long

My wife recent brought her macbook to me with a problem that suddenly popped up. Pretty much every website that had embedded video in it, other than youtube, was suddenly not working. The media player plugins were showing various errors, one of which was media_error_unknown. I opened chrome's developer tools for a better look at the errors. There were a few that indicated there might be a plugin or extension that was causing problems with some of the content. I tried disabling a few extensions like ad blockers and other security related plugins to see if that helped, but it didn't. I found some suggestions that pointed to proxies, but no proxy was configured. Avast was doing some web filtering, but turning that off didn't help either. Checked a few other browsers besides chrome and all had the same issue. When opening the media's link directly, it gave a browser "site is insecure" type of ssl error page. Lastly I thought dns would be a good place to check as our home wifi pushes out cleanbrowsing.org's dns servers. Usually these filtering companies redirect blocked ssl to some other ssl site that would have an invalid cert. So after switching her dns to static with google's 8.8.8.8, everything was up and running again. So likely it was a mistaken classification of a content delivery network that cause this problem for news web sites and other normal content sites.