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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.
I find the Portable version particularly useful when making use of a Cyber cafe as all my Bookmarks are intact and also I can enjoy the same browsing environment.
You can Download Portable Firefox freely at PortableApps Website.