Bug# 6540719 Firefox with JDK 6 will cause the browser to hang. It was fixed
on JDK 6u10, but it can be reproduced with JDK 6u14 again.

With the same test program, when you try shutting down FireFox 3.0.10
under Windows Vista (64-bit) the browser process will hang and have to be killed.
The applet icon remains in the taskbar.