Examine source code of Automatic Scroll

{
  "manifest_version": 2,
  "name": "Automatic Scroll",
  "version": "1.0",
  "description": "Automatically scroll the current page.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Automatic Scroll"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c721bba-777f-4130-a31b-4eaffb8b5c0b}"
    }
  }
}