Examine source code of Weather Mood Player

{
  "manifest_version": 2,
  "name": "Weather Mood Player",
  "version": "1.0",
  "description": "Plays ambient background music matching your local weather (rain, sun, cloudy, snow). Requires a click to start audio due to browser policies.",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "weather-mood.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "geolocation",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c375a397-bc6a-40ca-8a5c-d902b436a53d}"
    }
  }
}