Not sure that's a bug, so I'd rather ask you guyz if anyone had the same issue and find any solution. When I try to play a .webm music en Firefox, it just doesn't work. It does on Chrome though. I looked into the documentation and found that webm can cause troubles in Safari and Opera, but nothing about Firefox. Not sure to understand how to manage MIME types on my Dropbox server either (if that's it is about).
Thanks for your help!