Just posting this because it was such a bear to find the right answer as so many sites had the wrong one. I'm hoping it might help someone else.
Over the weekend I wanted to install the Java plugin on my Firefox 3.6.8 (as installed directly from Mozilla Firefox download). I followed the instructions at the link below from Java's site:
Which unfortunately were wrong
regarding the file to link.
They incorrectly show creating a link under the firefox/plugins directory with:
ln -s <JRE>/plugin/i386/ns7/libjavaplugin_oji.so
On CentOS5 after installing the
ln -s /usr/java/jre1.6.0/plugin/i386/ns7/libjavaplugin_oji.so
I also found that or variations on it in other web pages at Mozilla and around the web.
I finally found the correct
file to link in this page:
It shows that instead of the above:
ln -s <JRE>/lib/i386/libnpjp2.so .
On CentOS5 that was:
ln -s /usr/java/jre1.6.0/plugin/i386/libnpjp2.so .
It even notes at the bottom:
* The classic plugin file was located here:
This file should no longer be used and all symbolic links to it removed.
Other notes from me:
1) You first have to download and install the file from Java's site: jre-6u21-linux-i586-rpm.bin - There is also a non-rpm version if you're not using an rpm based distro.
2) Only JRE 6 update 10 or higher works with Firefox 3.6 or higher. (above is update 21).
3) This worked both with the Firefox 3.6.8 I had installed previously from Firefox download and with the Firefox 3.6.7 rpm installed using yum update with CentOS (the latter comes from the Fedora repository).