You can quit nautilus by command "nautilus --quit" in terminal (or in the Alt-F2 dialog). If you then save session and log out from Xfce session, nautilus should not be in background. But the problem reappears, if you happen to start nautilus without --no-desktop.
You can quit nautilus by command "nautilus --quit" in terminal (or in the Alt-F2 dialog). If you then save session and log out from Xfce session, nautilus should not be in background. But the problem reappears, if you happen to start nautilus without --no-desktop.