Displays a digital clock on a page.Displays a small digital clock at the corner of the screen, on a small semi-transparent patch. Colors and opacity are configurable. You can choose a 12- or 24-hour clock. The clock can be restricted to fullscreen mode only, which makes it ideal when reading text, e.g. with the Kindle Cloud Reader. Based on the original Overlay Clock extension by mk, improved to eliminate web site conflicts.