CRX - Chrome Extension is an extension for Chrome. If you are someone that is already using Google Chrome, you will definitely be able to take advantage of CRX since it does add extra features that are relatively neat. You will also be able to add new and exciting themes which can help you out with your current web browser. Images and many other files can also be added. You will have to drag the CRX files in order to install the extensions. The CRX file is deleted right away right after you have finished installing it. They also use .ZIP format so you must make sure you have this format installed on your computer already. This is something that is definitely worth having if you are using Chrome as your default web browser.