Examine source code of simple weather network

{
  "manifest_version": 2,
  "name": "simple weather network",
  "version": "1.0",
  "description": "removes clutter from weather network site.",
  "icons": {
    "48": "icons/sun-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.theweathernetwork.com/*"
      ],
      "js": [
        "simple_weather_network.js"
      ]
    }
  ]
}