Examine source code of FreeHandScroll

{
  "manifest_version": 2,
  "name": "Automatic Scroll",
  "version": "1.0",
  "description": "Automatically scroll down the page with adjustable speed.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba6da447-a2a6-4680-b78a-29f9169e973f}",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/48.png",
    "64": "icons/64.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Automatic Scroll",
    "default_popup": "popup.html",
    "default_icon": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}