Is there no item related to Private Browsing, or does it say "Start Private Browsing"? If the latter, then you probably weren't in a Private Browsing session to stop.

You can copy and paste this code in the "Tools > Error Console" and click the Evaluate button to see the current state of Private Browsing: var pbs = Components.classes["@mozilla.org/privatebrowsing;1"].getService(Components.interfaces.nsIPrivateBrowsingService); void(alert('Private Browsing is '+[[pbs.privateBrowsingEnabled)?'on':'off']]);

Hi Chris . It DOES say, "Start Private Browsing". in the menu. I agree that this means that PROBABLY one is not already in a Private Browsing Session. However, in this case, it was in the minority of chance, because the session WAS in a Private Browsing Session. I.e., all of my non-private FF windows had been closed by FF.

Thanks cor-el