- Go to www.firefox.com and download the latest stable version available (3.5.4 right now)
- Decompress the file to any location you desire (/home/aamr/firefox in my case)
- Delete the symbolic link "/usr/bin/firefox-3.5.4"
- Create a new symbolic link to point to your newly downloaded firefox (you must use sudo or login as root): "sudo ln -s /home/aamr/firefox-3.5.4/firefox /usr/bin/firefox"
"ln -s /usr/lib/jvm/java-6-sun/jre/lib/i386/libnpjp2.so libnpjp2.so"
Restart firefox and you're done.