The javascript implementation of audio tag (with mp3 sources only) does not working. The error event of play() method gives the error message saying that the file format is not supported. Even the basic w3schools example: http://www.w3schools.com/html/tryit.asp?filename=tryhtml5_audio_all does not working, having the mp3 only. It works, if I add the ogg source also: http://www.w3schools.com/html/tryit.asp?filename=tryhtml5_audio_all Tested on Samsung device, Android 5.0 O.S. version, Firefox 38 browser Note: on Android native and Chrome browsers is working (O.S. Android 5.0)