Zipped version of Firefox 1.0 can be found here . When I started using Firefox (then firebird), one of my top criterion was zipped version, So can carry around firefox in a usb flash drive. But now there is a whole new project dedicated to this concept Portable Firefox 1.0 (USB Drive-Friendly)
Portable Firefox is a fully functional package of Firefox optimized for use on a USB key drive. It has some specially-selected optimizations to make it perform faster and extend the life of your USB key as well as a specialized launcher that will allow most of your favorite extensions to work as you switch computers. It will also work from a CDRW drive (in packet mode), ZIP drives, external hard drives, some MP3 players, flash RAM cards and more (Note: It will not run from read-only media like a CD-R).