It is a fun extension which tells and shows you how much your browser travlled for any page you visited.
Every time you visit a page on internet (like this page), your browser talks to the server of this page behind the scene. That server could be anywhere in the world but the talk between browser and server completes in just seconds or even milliseconds. This extension tells you about the server of current page. Means it tells you the real distance between you and the current page's server. And it even shows your and server location on a map, cool huh? Think about travelling 10295 KM in 0.982 Seconds. And see the place in map where you just travelled electronically. :)