Examine source code of Tabd

{
  "name": "Tabd",
  "description": "Send this tab to a friend",
  "version": "3.0.3",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "storage",
    "notifications",
    "identity"
  ],
  "background": {
    "scripts": [
      "/js/config.js",
      "/js/jquery.js",
      "/js/underscore.js",
      "/js/backbone.js",
      "/js/BaseView.js",
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "/images/*.png",
    "html/overlay.html",
    "/fonts/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "/js/jquery.js",
        "/js/underscore.js",
        "/js/backbone.js",
        "/js/config.js",
        "/js/BaseView.js",
        "/js/overlay_compiled.js"
      ],
      "css": [
        "/css/overlay.css"
      ]
    }
  ],
  "content_security_policy": "script-src 'self' https://ssl.google-analytics.com; object-src 'self'",
  "browser_action": {
    "default_title": "Send this tab to a friend",
    "default_icon": "/images/icon32.png",
    "default_popup": "html/splash.html"
  },
  "oauth2": {
    "client_id": "593296776337-clpqr8hkkjhg3tvdebn38d2ctm08mdlv.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email"
    ]
  },
  "icons": {
    "16": "/images/icon16.png",
    "48": "/images/icon48.png",
    "128": "/images/icon128.png"
  },
  "manifest_version": 2,
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAimWWGwcjfGSac1qzJ5TjciC7P4lcK540shpdrUAlA3eP7vSwr6EO8faxXL7RuXINJv8qqoH9w3RP9pLH1xN/Mb8DkbUy0olx+U5g2RDkjKO+cbhSYRSnAK/8DC20pPvQFRsWR0xm4WdIjaMQlC0eo5i48owPOko5TA08wBWdtVkKuSL4cfeNrDoDCyTwZgDKzfkymBPATlm1psYIEE5kXg/SBm76+WOWeyx8YtZW4k/EVFfx2szxvP2wTS5ULCpZ4MVEbc8pHuIaK2gl1H1kmOcZ+v2rqqIIs2ri56ri7E7oJslNh32P4aMrGbjQBPJxK5qxq6cKvKqaN/kF/+JqTwIDAQAB"
}