installing firefox 1.5

[Douglas Alves]

I wish to install firefox 1.5 on my system.
After downloading and unpacking it, where should I place the firefox
folder that contains all the installation files?

I ask because this folder contains several executable and .so files and
I wondered if these should go in some special place.

I know this is kind of off-topic, but I couldn't find any installation
directives from http://getfirefox.com/releases/
In fact, there's no trace of this URL

Would it be perfectly good to leave the executable at home?