Examine source code of Substack PDF Downloader: Substack to PDF & Markdow

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "1.4.1",
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "permissions": [
    "storage",
    "identity",
    "downloads"
  ],
  "host_permissions": [
    "https://*.substack.com/*",
    "https://*/*",
    "https://substack-pdf-backend-sf6mtvli3a-pv.a.run.app/*",
    "https://www.googleapis.com/*",
    "https://content.dropboxapi.com/*",
    "https://api.dropboxapi.com/*",
    "https://cloud-api.yandex.net/*",
    "https://oauth.yandex.com/*",
    "https://oauth.yandex.ru/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "js/logger.js",
        "utils/constants.js",
        "utils/helpers.js",
        "js/constants.js",
        "js/utils.js",
        "js/infrastructure.js",
        "js/detection.js",
        "js/extraction.js",
        "js/naming.js",
        "js/settings.js",
        "js/ui.js",
        "js/engagement.js",
        "js/downloader.js",
        "js/notes.js",
        "js/notes2.js",
        "js/archive_downloader.js",
        "content.js"
      ],
      "css": [
        "styles/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "lib/browser-polyfill.js",
      "utils/constants.js",
      "services/cloudStorageService.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "24": "icons/icon24.png",
      "32": "icons/icon32.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*.png",
        "icons/chrome.svg"
      ],
      "matches": [
        "https://*.substack.com/*",
        "https://*/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "substack-pdf-downloader@neocortexai.in",
      "strict_min_version": "109.0"
    }
  }
}