• I’ve looked again and it’s probably one of the lists that contain hostnames to block. skimresources appears in all of these three, so enable them manually if they are not enabled: Dan Pollock’s hosts file, MVPS HOSTS, Peter Lowe’s Ad and tracking server list

    Edit: In the addon menu you can enable or block the domain dynamically when you are on the page. Unless you save the setting this is only temporarily changed.