Examine source code of Shorten URL

{
  "manifest_version": 2,
  "name": "Shorten URL",
  "description": "Create shortened URL from big URL",
  "homepage_url": "http://iamvp7.github.io/",
  "version": "1.1resigned1",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png"
    },
    "default_title": "Convert to short URL",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "http://tinyurl.com/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f7e00feb-14c8-4fdb-ab51-c610bd1b4a7d}"
    }
  }
}