Examine source code of Clear Session

{
  "author": "Daniel Groens",
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon-19.png",
      "38": "images/icon-38.png"
    },
    "default_title": "Clear Session"
  },
  "default_locale": "en",
  "description": "__MSG_appDescription__",
  "icons": {
    "16": "images/icon-16.png",
    "128": "images/icon-128.png"
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAh/LK5Oc5pmDWw0G/wQvgaUslNT3hFaCjSrfHvKj7Cy3r+pikk16jsUcexSZeABc92YuuOQZHaVgKy3g/+Xcp/q0JnMzrIy89Hh8HPUIHIOI9lTi7QTzUJhoVb0JIPufFRBylCJIQe48xGYpjFLba7Jl9t/J3Bzt9ESGjebzsaVyS4pAB4KbzlhKMzkpn3T3AmDuG137q40w6A6QXqhRPs5JLKF2Ir5pZB9aN1yA/IiTpHzQpauwrV3nI0zHL0hr/wGSctx3K4JuC2uPE8pedbZwk21fo+kzJRHlGZYkKyeeV++FA5aH5jthaI4xVwmrBnWkRSh8LXMMamlrNt2u8vwIDAQAB",
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "options_page": "options.html",
  "permissions": [
    "cookies",
    "*://*/*"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c36da13-31a1-430b-a32b-7fb260e1e454}"
    }
  }
}