Well, I did a removal of various self-installed firefox ..
and also remove the exclusion of firefox package from
/etc/yum.conf

[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
#exclude=opera,openoffice*,firefox,xulrunner
exclude=opera,openoffice*
# Note: yum-RHN-plugin doesn't honor this.
metadata_expire=1h

installonly_limit = 5

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d

then ..

yum install firefox

So, I got.. “Firefox 3.6.13″ installed.

Now, I want to add JRE support / plugins into this browser.
From my reading , it now need “New Generation plugins” of java plugin
instead of :

ln -s /usr/java/latest/plugin/i386/ns7/libjavaplugin_oji.so /usr/lib/mozilla/plugins

which was working before this.. but not with Firefox 3.6.13

it now require at least java 1.6.0-18 JRE/JDK.
which read as java 1.6 update 18.

So, I grab that java 1.6 update 18 from java.com website in the
old release archive.

sh jdk-6u18-linux-i586-rpm.bin

a precheck..

then I just need to do the following for ..

remove the old one..

rm usr/lib/mozilla/plugins/libjavaplugin_oji.so -rf

and add to cuurent user plugins directory as follows

cd ~/.mozilla
ln -s /usr/java/jdk1.6.0_18/jre/lib/i386/libnpjp2.so .

so.. it now detected..

resulting …

now.. my applet re-appear again.

References :

1. http://java.sun.com/products/archive/j2se/6u18/index.html
2. http://forums.mozillazine.org/viewtopic.php?f=38&t=1882695

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