Examine source code of Weather Pe

{
  "manifest_version": 2,
  "name": "Weather Peek",
  "version": "1.0",
  "description": "Quickly check the current weather in your city.",
  "permissions": [
    "activeTab",
    "geolocation"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{744221b4-bcc9-459f-a782-9470835d3b28}"
    }
  }
}