Examine source code of TTFM Extras

{
  "description": "Adds some extra functionality to turntable.fm",
  "manifest_version": 2,
  "name": "TTFM Extras",
  "version": "1.6",
  "homepage_url": "https://github.com/dejanGH/TTFMExtras",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@x2.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://turntable.fm/*"
      ],
      "js": [
        "lib/jquery.js",
        "main.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ]
}