To add this to your chrome browser, simply download the zip file, unzip it, then open up your chrome settings (either by opening it up through the menu or by typing in the address chrome://settings/ into your address bar) and navigate to extensions, near the bottom. Click on the button that says, "Load Unpacked." Now, simply navigate to the directory where you unzipped those files, and select that folder (it should have background.js and manifest.json inside.)

After it loads, you can simply right click on a link to an article, and it will open up using the archived/cached version.