Hey there! Please see the following links: http://www.ghacks.net/2014/06/13/fix-error-occurred-please-try-later-youtube-error/‘ https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues https://youtubedownload.minitool.com/youtube/youtube-not-working-on-firefox.html https://smallbusiness.chron.com/problems-playing-youtube-videos-firefox-browser-66255.html Hope I helped! Kind regards, Bithiah

Hey there! If your problem is fixed, please mark an answer as the solution to let others know that this question is solved. Thank you! Kind regards, Bithiah