If you're in a public place and don't wish for images to display, you can enable text-only mode, hiding all images. You can do this by clicking "Turn Text-Only Mode On" at the footer (bottom) of the website.
If you're seeing "Media Off" and want to disable text-only mode so that you can see images again, you can do that by clicking "Turn Text-Only Mode Off" on the footer (bottom) of the website