Mozilla Firefox Portable 4.0
Mozilla Firefox, Portable Edition – your browser, your way… in your pocket
Mozilla Firefox Portable Edition 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.
Download: Mozilla Firefox Portable Edition 3.6.8