Examine source code of Weather Check

{
  "manifest_version": 2,
  "name": "Weather Check",
  "version": "1.0",
  "description": "Quickly check the current weather in your location.",
  "permissions": [
    "geolocation"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc8e4b6c-7ea2-4175-b16a-5e288d79f148}"
    }
  }
}