I have a series of .mp3 files inside a game (sound effects and music), and when I load the game in Firefox, the game insists in loading the same files, but with .ogg extension. I’m even getting this error when loading the music:
The “text/plain” HTTP “Content-Type” is not compatible. The media resource loading has failed http://[url-to-file]/tv-noise.ogg
Update: please note that all .mp3 files have their corresponding .ogg and both are present in the same directory.