Manually enabling the new 64-bit Java plugin

I found that I had to do the following to enable the new Java 6 Update 12 64-bit plugin, which was just released as part of Java 6 Update 12.

$ cd /usr/lib/firefox-3.0.5/plugins
$ sudo ln -s /opt/jdk1.6.0_12/jre/lib/amd64/libnpjp2.so .

Then restarting Firefox & doing "about:plugins" correctly showed the Java plugin as loaded up.