Recommend fixes for Firefox freezes.crashes on Amazon Prime Video page (Mac Sequoia 15.8.1)

Running Mac Sequoia 15.8.1 I launch Firefox, login to Amazon Prime and when I get to Amazon Prime Video page, Firefox freezes, won't respond at all, and play button shows a rotating circle (see attached). Firefox -does- play video on Youtube and other video websites. Safari on this same laptop plays Amazon Prime Video just fine. All other computers/browsers in my household utilize Firefox to play Amazon Prime Video just fine, so it's something out of whack on this MacBook pro. I have uninstalled and reinstalled Firefox several times with full reboots each time but to no avail. Please provide any other options.