Examine source code of Auto Scroller

{
  "manifest_version": 2,
  "name": "Auto Scroller",
  "version": "1.3",
  "description": "Automatically scroll down the page with adjustable speed.",
  "applications": {
    "gecko": {
      "id": "{509b981e-806b-4823-a1bd-fde33baf75cd}",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Auto Scrolling",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}