the java applet was the only way I could listen to my music from my RHEL4 machine … and that worked …
I found an open source Java application a couple of weeks ago which can act as a remote player to iTunes/Firefly via DAAP. See the earlier thread at http://forums.fireflymediaserver.org/viewtopic.php?t=4720 or the download of the Java application itself from http://getittogether.sourceforge.net/
That might be an even better option for you than the applet included within Firefly? Might be worth a try anyway.