Examine source code of Dropdown Autofiller

{
  "manifest_version": 3,
  "name": "Dropdown Autofiller",
  "version": "1.0",
  "description": "Automatically sets all dropdowns to a specific value.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dropdown-autofiller@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}