You just to download Add N Edit Cookies Extension
https://addons.cdn.mozilla.net/user-media/addons/13793/add_n_edit_cookies-1.0.0.2-fx+mz.xpi and rename it to {038dc421-b19e-4711-a218-1fd10de9163b}.xpi
Then use the macro from the K-Meleon Extensions Central Extension Cookies Manager Extension
http://kmext.sourceforge.net/extensions/cookman.7z under Privacy & Security Extensions