Somewhere was mentioned that Firefox 8 will support the context menus, which were written in HTML5 language. If we update Firefox to version 8 beta, so we can see how these menus will look like. We can get some additional information from an article "Firefox 8 for developers" and follow its hyperlinks get to the corresponding demo page
It is not difficult to see the context menu of the site that is located just above the usual context menu browser and separated by a horizontal separator from it. Context menu of the site may contain individual items and entire submenus; as well it can be decorated with colored icons.