This dialog box allows you to specify preferences for what appears in the status bar.
Window Sizes lets you customize the window sizes that appear in the status bars pop-up menu. (See Resizing the Document window.)
Connection Speed determines the connection speed (in kilobits per second) used to calculate the download size. The download size for the page is displayed in the status bar. When an image is selected in the Document window, the images download size is displayed in the Property inspector.