Examine source code of Substack to PDF

{
  "manifest_version": 2,
  "name": "Substack to PDF",
  "version": "1.1",
  "description": "Convert Substack articles into beautifully typeset PDF files",
  "browser_specific_settings": {
    "gecko": {
      "id": "substack-to-pdf@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icon.svg"
    },
    "default_title": "Substack to PDF",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}