I don't know if you have the technical know-how to do it but flash has recently had many vulnerabilities so it's blocked in ff by default (I personally always use the html5 version anyways), so could you change it to use the html5 embed instead?
https://i.imgur.com/C1VQPvV.png
also flash always crashes for me...
https://developers.google.com/youtube/player_parameters
here's some more info on it:
https://developers.google.com/youtube/player_parameters
https://developers.google.com/youtube/iframe_api_reference#Loading_a_Video_Player
I think their iframe embed is an "intelligent" version and uses the google account settings.
The youtube api version is more complicated imo
https://i.imgur.com/C1VQPvV.png
also flash always crashes for me...
https://developers.google.com/youtube/player_parameters
here's some more info on it:
https://developers.google.com/youtube/player_parameters
https://developers.google.com/youtube/iframe_api_reference#Loading_a_Video_Player
I think their iframe embed is an "intelligent" version and uses the google account settings.
The youtube api version is more complicated imo