You tube links from Facebook are requiring a google email address

in the last few days links from facebook to you tube and even youtube itself is requiring a Google address to see the video. Ai google search says for Firefox you need to adjust and turn off your enhansed security which sounds dangerous. I added youtube to my security exceptions I think but still the black screen requiring email. I so not want to share that. Can you advise on how to get you tube to work again with Firefox. Thank you