I thought I would share this with everyone as I didn't see the application listed on this site.
Portable Firefox can be used from any portable drive without installing it on a computer.
The Mozilla Adapter executable didn't work for me so I just went ahead and installed the roboform-firefox-1.5.xpi extension and it works a treat.
Pass2Go (Portable RoboForm) was the first application I had that was truly portable and got me interested in trying to run everything I need from standalone installations on my portable drive. Then I discovered John T. Haller and his portable applications such as FireFox and Thunderbird which was great and then became an obsession ;). I am glad that this community has grown and will hopefully drive the development of more of these types of applications. Keep up the good work.