Examine source code of Input autofocus

{
  "manifest_version": 3,
  "name": "Input autofocus",
  "version": "1.0",
  "description": "Sets focus to the first text input element on a page.",
  "author": "Andrii Malyshko",
  "homepage_url": "https://github.com/nashbridges/firefox-input-autofocus-addon",
  "browser_specific_settings": {
    "gecko": {
      "id": "input-autofocus@nashbridges.me",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "scripting"
  ],
  "optional_permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options/index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  }
}