Java and Firefox 3.6

[Nigel Ridley]

I just noticed that according to about:plugins I don't have the java plugin installed.
I do have the sun-java-plugin installed and so tried the following:
nigel at nigel:~$ sudo  ln -s 
/usr/lib/jvm/java-6-sun-1.6.0.15/jre/plugin/i386/ns7/libjavaplugin_oji.so 
/usr/lib/firefox-addons/plugins
[sudo] password for nigel:
nigel at nigel:~$ sudo  ln -s 
/usr/lib/jvm/java-6-sun-1.6.0.15/jre/plugin/i386/ns7/libjavaplugin_oji.so /usr/lib/firefox/plugins
nigel at nigel:~$

[above code is broken up by mail client's line wrap]

Restarted Firefox (Namoroka actually) but still no java.

On checking the various firefox dirs I do have symbolic links in all the plugin dirs.

How does one get java working?