I did a search but could not find this problem listed in that if you are using Firefox Portable on Windows 7 beta your bookmarks are stored by windows in the user folder even after you have removed the drive containing Firefox Portable from the pc.
IE: c:\user\yourname\AppData\Roaming\Mozilla\Firefox\Profiles\xxxxxxx.default.
just do a search for the rest.
Sorry if this has been posted elsewear if it has can a Mod please delete.