Pre-requisites.

I don’t know how much of it its really needed, but I install the whole Sun’s Java 6 packages,

$ sudo apt-get install sun-java6-jdk sun-java-6-jre sun-java6-pluging
   sun-java6-source sun-java6-bin

For sure you’ll need the jdk and plugin one… If your internet connection is slow you might try installing these two first and try the above command.

Configuration of Java for Mozilla.

For  enable Java plugin on Firefox 3.6,

$ sudo update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so \
   mozilla-javaplugin.so /usr/lib/jvm/java-6-sun/jre/lib/i386/libnpjp2.so 50

Now it’s time to restart your browser.

For checking that the plugin is enabled, open your Firefox browser and type

about:plugins

in the address line, there must be the Java application enabled.