APPLE TV not playing with Firefox 115.28.0esr

Hello Apple Community! I am using Firefox 115.28.0esr on an older 2011 Mac I bought brand new from Apple Store (*upgraded in recent years to 16GB Ram - 1333 MHz DDR3 + upgraded SSD) limited to High Sierra 10.13.6.  Mac runs like new after 15 years.  I’m running Firefox in private browsing mode, allowing Pop-Ups for https://tv.apple.com, allowing Audio Video play, operating default protections for DNS, un-blocked dangerous and deceptive content [*only for the above Apple link], made sure to clear all cache and cookie with browser Re-Start, plus disabled Enhanced Tracking Protection for said link. APPLE TV movie trailers play just fine, yet when I click on "Play" icon to watch the movie it populates a solid black screen. Attaching screen shot below for your inspection. What am I missing?

Thank you for you time and consideration, 

Mr. B

[Edited by Moderator]