Digital Clock is a Webextension I created in preparation for my Anima OS reboot.
Digital Clock adds a toolbar icon that displays the current time and, upon hovering, the current date too. Part of the time is rendered inside a dynamic image whereas the other part is displayed in a badge.
A user may switch between this behavior (i e display either the minutes inside the badge — as is the default — or the hour) by clicking on the icon and checking/unchecking “Reverse display”.