manifest.json

{
    "name": "LogMeOut",
    "version": "0.1",
    "description": "Removes all cookies from Facebook when you log out of Facebook. See http://nikcub.appspot.com/logging-out-of-facebook-is-not-enough for a discussion of why this is important.",
    "background_page": "background.html",
    "content_scripts": [
        {
          "matches": ["http://*/*", "https://*/*"],
          "js": ["contentScript.js"]
        }
    ],
    "permissions": [ "http://*/*", "https://*/*", "cookies", "tabs"]
}