Examine source code of weatherpro

{
  "manifest_version": 2,
  "name": "weather",
  "version": "1.1resigned1",
  "browser_action": {
    "default_title": "weather",
    "default_popup": "popup.html"
  },
  "permissions": [
    "http://api.openweathermap.org/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{458fdacc-12cb-4141-b7db-0bad443b104d}"
    }
  }
}