If you use Konqueror and use Facebook, you might have noticed that Chat Window does not show up as normal and opens in a new window. In firefox or other supported browsers, you will see chat icon as this one:
If you click on that one, you will be able to chat normally.
However, when you use Konqueror or other unsupported browser, you might see something like this one:
If you click on this however, the chat will open in a new window.