play.spotify.com/browse , it clearly asks the user to enable manually , this does not requires JS, but rather interpreting the browser by clicking
<a href="https://get.adobe.com/flashplayer/" target="_blank">Clique aqui</a>
It will show a notification, depending on the browser , test this , like here:
Chrome by default already has Flash installed and updated by default, but off, unless you manually remove it . Other browsers may not even have access to Flash, this same link will point to the Flash download page.