make Tor Browser fail to connect when not launched from Vidalia
It is possible to directly launch Firefox. On Windows users who launch TBB will have two icons in their taskbar/dock like thing - a Vidalia onion and the Browser planet icon. Users who run TBB will "pin" the browser icon and run that directly.
We must prevent this - probably by ensuring that the browser will launch the right things if a user attempts to do this.