The featured video appears on the channel page for me. Try [[Clear cookies and site data in Firefox#w_clear-cookies-for-the-current-website|clearing site cookies]] and [[Enhanced Tracking Protection in Firefox for desktop#w_what-to-do-if-a-site-seems-broken|disabling Tracking Protection]] for the site. Does it still happen in [https://aurora.mozilla.org Developer Edition]? Do not sign in to your youtube account or sync account when testing.

thanks everyone seems like it is working now. I appreciate all your help!!