The latest version of Firefox is now also available in a portable version. The portable Firefox can be launched from external hard drives, iPods, and other removable media including USB sticks, CDs, and the like, with no installation needed. The browser itself, bookmarks, and the individual browser extensions are always the same independent of the computer and its settings.
Firefox Portable can be used with all versions of Windows and the current settings will be saved after you close the browser.