How to animate a favicon like that?
It seems to work only in Firefox.
While it’s currently only supported by Firefox other browsers will hopefully support it in the future. To achieve the effect, you need to upload the gif to your server and then add the line below to
head section of your page:
<link rel="icon" href="animated_favicon.gif" type="image/gif" >
Take a look at AnimatedFavIcon.com for additional help and resources.