Examine source code of Jawaker Hack

{
  "manifest_version": 2,
  "name": "Jawaker Hack",
  "description": "",
  "version": "1.0.1",
  "content_scripts": [
    {
      "matches": [
        "https://www.jawaker.com/*"
      ],
      "js": [
        "js/inject.js"
      ],
      "css": [
        "css/main.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "js/content.js"
  ]
}