You just have to donwload the Firefox Extension Policy Manager https://addons.cdn.mozilla.net/user-media/addons/7066/policy_manager-2.2.2009110501-fx.xpi and rename it to {CE494EE3-65A1-4f63-8FC1-645217F86979}.xpi

Then use the macro from Policy Manager fro K-Meleon 74 http://kmext.sourceforge.net/km74/policymanager-km74.7z at K-Meleon Extensions Central.