Just a note about Firefox and Updates...
This is more of a suggestion to the developer of Portable Firefox, who I hope reads these forums. I don't know if this has been mentioned before but please disable Firefox update by default in future releases. Or at least change the settings so that it won't automatically download and try to install updates. I launched Portable Firefox only to have it try to patch itself to 1.5.0.1 Of course the patch failed so it instead tried to download the entire 6.0 MB installer. I've disabled it myself as of now.