How to install Firefox 3.5 in BOSS/Linux operating system

First download firefox from http://www.mozilla.com/en-US/firefox/firefox.html
extract it.(considering that it extracted at /opt folder)
Next, make a shortcut to the firefox executable - right click on the desktop, click on Create Launcher, and at the Command field enter the command below:
/opt/firefox/firefox -P
The -P switch will start Firefox 3.5 using the profile manager, so from here all you need to do is to create a new profile for your Firefox 3.5:
if default profile is used then create new profile ex. BOSS and then path to dir.
Additionally, you can specify the --no-remote switch (firefox --no-remote -P) so you can run both your currently 3.0.11 and 3.5 instances at the same time. The --no-remote switch doesn't connect Firefox to a currently running instance.