Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

You can check the Web Console to see if there is more detail available.

• https://firefox-source-docs.mozilla.org/devtools-user/web_console/

Here is the info from the browser console: Console

No, I cannot get to a place that doesn't require sign-in. Medscape always requires that and I don't know a way around it, sorry.

Thanks for the help!!!

I can view the video and here is a link. https://www.medscape.com/viewarticle/973355

Did you try with Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode