Examine source code of Online Pixel Converter

{
  "manifest_version": 3,
  "name": "Image Resizer",
  "description": "Resize images directly from your browser.",
  "version": "1.0",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Image Resizer"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "image-resizer@example.com"
    }
  }
}