Is this a google chrome extension?

http://imagecdn.maketecheasier.com/2010/02/chrometabs-main.png



is that a google chrome extension where "TAB'S" are Iconized? or it's a feature for google chrome user under windows 7? if it is an extension i would like to know what specific extension it is.. :)Is this a google chrome extension?
I'm pretty sure those are "pinned" tabs. It saves more room by just showing the icon. Like with Yahoo, it would only show a "Y!"



You just right click the tab and click "pin tab" to unpin it, click "unpin"