Java is a kind of "too heavy" aplication for me, insted of unstable. I've tryed to unable it from the browser's options, but it still appearing. In addition to this, i can't understand a word of what are they saying, cause there's only a few German ppl chating. I recomend you to link the chat channel on a window, so the one who wish to chat in it, just click on there and recieve a popup, or the chat activation below the whole page, as it atcually is. I wish you can help out with this, cause it's really annoying. Sometimes the java crushes and closes up all my browser's windows 
See ya!