Examine source code of better autoscroll

{
  "manifest_version": 2,
  "name": "better autoscroll",
  "version": "1.0",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "app.js"
      ],
      "css": [
        "app.css"
      ]
    }
  ],
  "icons": {
    "32": "auto-scroll.svg"
  },
  "web_accessible_resources": [
    "auto-scroll.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2a12425a-e060-43e0-9da0-99c033a27a46}"
    }
  }
}