Examine source code of Tweakers +2 scroller

{
  "name": "Tweakers Scroll",
  "version": "0.1",
  "description": "Tweakers Scroll",
  "manifest_version": 2,
  "permissions": [
    "https://*.tweakers.net/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://tweakers.net/*"
      ],
      "run_at": "document_end",
      "js": [
        "scroll.js"
      ],
      "css": [
        "scroll.css"
      ]
    }
  ]
}