Examine source code of Aoe2.net Dark Theme

{
  "manifest_version": 2,
  "name": "Aoe2.net Dark Theme",
  "version": "1.0",
  "description": "Changes the appearence of aoe2.net to a dark-colored version.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://aoe2.net/*"
      ],
      "js": [
        "aoe2netdark.js"
      ],
      "css": [
        "css/datatables.css",
        "css/bootstrap.css",
        "css/maincss.css"
      ]
    }
  ]
}