1. Go to http://www.firefox.com and download the latest stable version available (3.5.4 right now)
2. Decompress the file to any location you desire (/home/aamr/firefox in my case)
3. Delete the symbolic link “/usr/bin/firefox-3.5.4”
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”

After I did this, I found out that my Java plugin is not there when I type “about:plugins”!!, I found that I should point to the java plugin from my newly installed firefox plugins folder (/home/aamr/firefox-3.5.4/plugins), so I created a symbolic link pointing to my Java plugin (after navigating to “/home/aamr/firefox-3.5.4/plugins”:

“ln -s /usr/lib/jvm/java-6-sun/jre/lib/i386/libnpjp2.so libnpjp2.so”

Restart firefox and you’re done.