While all the MAC Users today got the Google Chrome browser for their plat form,Windows users got extensions to their well established web browser.
There are about 338 extensions listed on Google Chrome Extensions site. Make sure that you have the latest version of Chrome, otherwise you will not be able to install them.
Google translate seems to be the todays favorite exxtension but I thought the Twitter extension called Chromed Bird was great.
Google Chrome for the holidays: Mac, Linux and extensions in beta