a mozilla firefox executable file?

A friend and i , are in a class that uses computer (accounting) , we want to be able to use firefox to suref the net, but we want to use it, with it modifying the registry files by installing. instead i was wondering if it is possible to run firefox by just an exe file, if this is possible can someone link me to where i can get one.... thanks in advanced...

Doesn't portable firefox do that? :unsure:

You can try running FireFox from a removable storage device (such as usb, or CD): http://www.mozilla.org/support/firefox/tips#oth_usb

Thanks alot for the info guys. I got portable firefox and it worked on my school's computer, thanks alot for the help :)