Another day, another Chrome theme. This one is for Applejack. I don't know if the tab-theme bar looks right, but I will eave that to you to decide.
Windows (I can't speak for Mac users.), being unable to identify the .crx file in the zip file will bring up a window asking you to identify it online, or open it from a list of programs. Choose the latter and hit okay.
Search through the list of programs given. If Chrome is not there, hit Browse. you should then be able to find it in the list (XP) or just select a shortcut (Win7). Select it.
On the bottom bar of the browser (where downloads are shown) a warning should appear asking whether or not you want to install it. Click yes, and it will install.
My Little Pony: Friendships is Magic (C)
, Studio B, & Hasbro
Google Chrome (C) Duh.