For a long time i had not sound in Firefox on Sites using Java (hobnox.com, runescape.com) I tested the Javasound localy withe the JavaSoundDemo: http://java.sun.com/products/java-media/sound/samples/JavaSoundDemo/ and i worked flawlessly. I had to activate the OSS Sequencer API in the Kernel under: Device Drivers/Sound/Advanced Linux Sound Architecture/ So even modern sites still use and need the OSS API, good to know :)