Examine source code of URL Shortener

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "URL Shortener",
  "version": "1.0.5resigned1",
  "icons": {
    "16": "16x16.png",
    "32": "32x32.png",
    "48": "48x48.png",
    "128": "128x128.png"
  },
  "permissions": [
    "tabs",
    "http://u.lokilab.ru/"
  ],
  "browser_action": {
    "default_title": "URL Shortener!",
    "default_icon": "48x48.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6526cad4-fe3d-4b75-be26-9ef8c94eeac5}"
    }
  }
}