I sent this info to a member of these forums...but I thought everyone might like to know about this, especially those among us...like myself..who can't install Firefox at work.
the basics is...you get a USB drive card, doesn't have to be big...firefox itself takes up less then 20mb. download ff onto it, either the zip folder and extract or the installer and install.
FF will work off of the usb drive...it won't, however, allow you to save favorites and customize the toolbars...because ff is coded to use the profile folder on the c drive. I personally have not figured out how to fix that, I'm sure there has to be a way...but I don't know it yet.
for more info on this technique, go here:
Firefox forums discussion