Page is a not externally linkable
-- Firefox Browser Usage and Support
---- FF 17.0.1 : where did the cookies exceptions list go?
SevenCubed - 1:36 am on Dec 5, 2012 (gmt 0)Thread source:: http://www.webmasterworld.com/firefox_browser/4525147.htm
From that same page you mention select "use custom settings for history" from the drop down list then the exceptions you are searching for should appear.
Brought to you by WebmasterWorld: http://www.webmasterworld.com