The appropriate URLs do show up in the status bar at the bottom of the browser window, but these are not always very helpful. Human' is the word so often omitted from the term 'Interface Design'. Early computer interfaces were 'menu driven' using the keyboard. Press 'S' to save the file - easy. What made it all so easy to use was not the playful icons, the drop down menus, the helpful dialog boxes.
People understand the concepts of documents, folders and wastebaskets.
The incomprehensible collection of zeros and ones that the computer is quite happy with, is given a human-comprehensible form. In the context of a drawing program, an icon of a pencil or eraser is immediately identifiable and the tools' functions understood. Sometimes icons are clear enough by themselves. Sometimes they need a word or two underneath. But more recently, and as programs become more complicated, icons are being used to describe concepts that are much too complex or inappropriate, and they fail miserably.