Any noticed that the IcedTea java plugin is crashing Firefox, whenever a java applet is trying to load? I've replaced it with the Sun JRE one and it seems to work fine. But I prefer to use the default OpenJDK version.
I've got the following java plugin installed:
java-1.6.0-openjdk-plugin-1.6.0.0-29.b16.fc11.i586
Reported this in a similar bug report
https://bugzilla.redhat.com/show_bug.cgi?id=496782