Install JRE for 32bi firefox on Linux AMD64 Platform

For Ubuntu9.0.4 runs on AMD64, it looks to me problem solved after install ia32-sun-java6-bin and ia32-libs

32 bit Browsers on 64 bit Systems

Using a 32 bit browser on a 64 bit system has been the most common way of getting plugins to work. Users of 32 bit browsers on 64 bit systems should consult the Linux (x86) section of PluginDoc for more information.

Goto sun.com to download JRE
http://java.sun.com/javase/downloads/index.jsp


http://plugindoc.mozdev.org/linux.html

1. Install Java Runtime Environment.
2. Make a symbolic link to libjavaplugin_oji.so in your Mozilla Plugins directory. Use the copy located in the plugin/i386/ns7 directory of JRE 5.0 or later, or plugin/i386/ns610-gcc32 if you are using JRE 1.4.2.

hmc@hmc-desktop:/opt/firefox$ cd plugins/
hmc@hmc-desktop:/opt/firefox/plugins$ ls
libnullplugin.so
hmc@hmc-desktop:/opt/firefox/plugins$ sudo ln -s /opt/java32/jre1.6.0_17/plugin/i386/ns7/libjavaplugin_oji.so ./
[sudo] password for hmc:
hmc@hmc-desktop:/opt/firefox/plugins$ ls -lrt
total 20
-rwxr-xr-x 1 hmc hmc 15824 2009-11-03 07:01 libnullplugin.so
lrwxrwxrwx 1 root root 60 2010-01-02 19:48 libjavaplugin_oji.so -> /opt/java32/jre1.6.0_17/plugin/i386/ns7/libjavaplugin_oji.so
ange directories to the Firefox plugins directory, then create a symbolic link to the Java Plugin libjavaplugin_oji.so fileThe JRE is under /usr/java/latest directory

3. Check that the Java Plugin is installed.

In Firefox, type about:plugins in the Location bar to confirm that the Java Plugin is loaded. If the version is Firefox 1.5 or later, click the Tools menu to confirm that Java Console is there.