This post in mainly for my own usage, my brain loose very quickly informations 
I use Ubuntu Intrepid Ibex 64bit version with Firefox Linux x86_64 and occasionally I need to visit some website using Java applets, as well known to run Java plugin you need to use the Firefox 32bit version because the Java plugin exists only for this architecture.
I don’t want to trash my FF 64bit (also Swiftweasel) only for Java plugin so I’ve decided to configure Prism to use the websites needing java plugin.
- Install the 32bit version of java
sudo apt-get install ia32-sun-java6-bin - Create a symlink to plugin
sudo ln -s /usr/lib/jvm/ia32-java-6-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so /home/dave/.mozilla/plugins/ - Create a prism webapp, for example using the Sun test page
The destination path /home/dave/.mozilla/plugins/ must be modified according to your settings
This confirms Prism is rock 
EDIT (05 July 2009) After Sun released the plugin compatible with 64bit platforms you can change the symlink to
ln -s $JDK_INSTALLED_DIR/jre/lib/amd64/libnpjp2.so /home/dave/.mozilla/plugins/
as described at PluginDoc web page
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