http://portableapps.com/apps/internet/firefox_portable
QUOTE
Mozilla Firefox - Portable Edition is the popular Mozilla Firefox web browser packaged with a PortableApps.com Launcher as a portable app, so you can take your bookmarks, extensions and saved passwords with you
This is a plugin for Firefox Portable
this plugin runs from ramdrive
Run 1stconfig.cmd
It will Allow you to make any changes to the app you may want, then will recompress firefox portable to an sfx archive to work with ubcd4win.
Firefox portable plugin:
http://rapidshare.com/files/6857654/firefox.7z.html