How to enable Java in Firefox in BOSS Linux ?

Assumption : You have JDK and Firefox and have installed those packages in your System .

You can get JDK from here : http://www.oracle.com/technetwork/java/javase/downloads/index.html
You can get Firefox from here : http://www.mozilla.com/en-US/firefox/

How to Proceed then ?
Type the following commands in the Terminal.

cd <Firefox installation directory>/plugins
ln -s /lib/i386/libnpjp2.so

Then restart your browser.
In Firefox, type about:plugins in the Location bar to confirm that the Java Plugin is loaded. You can also click the Tools menu to confirm that Java Console is there.

You can check whether Java is configured correctly with the browser,
from the following link
http://java.com/en/download/installed.jsp

This will tell the Version of JDK installed in your System.

For example,
If you have installed JDK in the location
/opt/jdk1.6.0_17/
and
Firefox in the location,
/opt/flock/
Then the command will be as follows.
cd /opt/flock/plugins
ln -s /opt/jdk1.6.0_17/jre/lib/i386/libnpjp2.so

then restart your browser.

Reference:
http://www.java.com/en/download/help/linux_install.xml