Examine source code of Weather Forecast v6

{
  "manifest_version": 2,
  "name": "Weather Forecast",
  "description": "Get the current weather forecast based on your location.",
  "version": "1.0",
  "permissions": [
    "geolocation",
    "http://api.openweathermap.org/"
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3b51402f-3d01-4131-9b46-00bdb510c6ca}"
    }
  }
}