Examine source code of Quick Page Screenshot a

{
  "manifest_version": 2,
  "name": "Quick Page Screenshot",
  "version": "1.0.0",
  "description": "Capture screenshots of webpages instantly.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ext-d52db722af0f4e768ae8700223aacfac@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}