Examine source code of Twitter Normalizer

{
  "manifest_version": 2,
  "name": "Twitter Normalizer",
  "version": "1.0.0",
  "description": "Normalize twitter design",
  "icons": {
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*"
      ],
      "js": [
        "normalize.js"
      ],
      "css": [
        "normalize.css"
      ]
    }
  ]
}