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[cypher <guohuo85@xxxxxxxxxxx>]

go to /usr/lib/firefox-addons/plugins$

and do:

sudo ln -s /etc/alternatives/firefox-javaplugin.so

I am using firefox beta 4 and ubuntu gutsy 7.1 my applet works already.
If you are seeking to get your java up on firefox

if you cannot find firefox-javaplugin.so maybe you can try 
ls -l | grep firefox 
to get all the files that are related to firefox
probably one of them is the firefox javaplugin link

just swap my given firefox-javaplugin.so for that file that you found and try if it works.
hopefully this helped
Thanks to those who posted above that leaded me to /etc/alternatives and /usr/lib/firefox-addons/plugins I would never have figured out where the plugins are myself

-- 
java plugin not working in firefox 3 on ubuntu 8.04
https://bugs.launchpad.net/bugs/173966
You received this bug notification because you are a member of OpenJDK,
which is subscribed to icedtea-gcjwebplugin in ubuntu.

Status in Source Package "epiphany-browser" in Ubuntu: Invalid
Status in Source Package "firefox" in Ubuntu: Invalid
Status in Source Package "firefox-3.0" in Ubuntu: Invalid
Status in Source Package "icedtea-gcjwebplugin" in Ubuntu: Fix Released
Status in Source Package "sun-java5" in Ubuntu: Fix Released
Status in Source Package "sun-java6" in Ubuntu: Fix Released
Status in Source Package "ubuntu-restricted-extras" in Ubuntu: Invalid

Bug description:
Java viltual keyboard are not working on bank sites. Used to work on kubuntu 7.10 up to date. I'm using kubuntu hardy packages from 04/12/07.
Java is not working on Firefox3 too.
Pls advice about what info you need.