Examine source code of scroll liberator

{
  "manifest_version": 2,
  "name": "scroll liberator",
  "description": "liberate scrolling from abusive websites",
  "author": "Andrew Zhao",
  "version": "0.1",
  "content_scripts": [
    {
      "matches": [
        "*://*/**"
      ],
      "js": [
        "script.js"
      ],
      "run_at": "document_start"
    }
  ]
}