It seems to me that this has nothing to do with the plugin itself. From the articles and the responses, it seems that it is only his website that blocks the CSS

It seems to me that this has nothing to do with the plugin itself. From the articles and the responses, it seems that it is only his website that blocks the CSS popups of Ghostely. The plugin does not do any harm to ghostery. He just uses a CSS rule on his website to disable some of ghostery's functionality.