Examine source code of UG-Scroller

{
  "manifest_version": 2,
  "name": "UG-Scroller",
  "version": "1.1",
  "description": "An extension to scroll automatically on Ultimate Guitar",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "*://tabs.ultimate-guitar.com/tab/*"
      ],
      "js": [
        "autoscroll.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4d5ac89-6ab9-43f3-93ce-d804ef8eefd0}"
    }
  }
}