Installing Java and Enabling Firefox to Use It

sudo -i  # enter your user password
apt-get install sun-java6-jdk
update-alternatives --config java    # select the sun java6 jdk option
cd /usr/lib/firefox/plugins
ln -s /usr/lib/jvm/java-6-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so
exit