Portable Firefox is a fully functional package of Firefox web browser optimized for use on a USB pen drive. It has some specially-selected optimizations to make firefox web browser perform faster and extend the life of your USB drive as well as a specialized launcher that will allow most of your favorite firefox 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). This is an unofficial package (Windows-only for now). It is an official build, but has been modified and a specialized launcher added to make extensions portable. No warranty is expressed or implied.
Latest version release:
Portable Firefox 12
Download Portable Firefox 12 (17Mb download)