Recently (November 15, 2016), Firefox pushed out Firefox 50. It seems that some OGG files no longer work with this version of Firefox. I have created a simple Fiddle for fellow developers to test it out. https://jsfiddle.net/mkeqa2m5/ If you run the same test on Chrome, everything works fine. But, try it on Firefox and it doesn't work. Have anyone encounter this issue yet? If you have, what is the easiest way to fix this issue on the code side so that the audio plays on Firefox again. (Any debugging recommendations would be appreciated too)