An extension that is aptly named - it will provide you with cats, with perhaps about once per month a bunny or dog sneaking in.
There is no purpose to this extension beyond making you smile one additional time each day.
Upon installation, the extension will add a small browser button. Clicking it will produce your daily cat. It will never introduce itself unless you click the button.
You can click the button as often as you like, but a new cat will only appear overnight. Each day has its own cat, like a picture calendar.