Examine source code of StockManager

{
  "manifest_version": 3,
  "name": "StockManager",
  "version": "2025.1005",
  "author": "Martin Berner",
  "icons": {
    "48": "assets/icon48.png"
  },
  "action": {
    "default_icon": {
      "48": "assets/icon48.png"
    },
    "default_title": "StockManager"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "downloads",
    "notifications",
    "storage"
  ],
  "host_permissions": [
    "https://www.tradegate.de/*",
    "https://*.finanzen.net/*",
    "https://fx-rate.net/*",
    "https://www.goyax.de/*",
    "https://www.wallstreet-online.de/*",
    "https://*.aktiencheck.de/*",
    "https://www.tagesschau.de/*"
  ],
  "options_ui": {
    "browser_style": false,
    "open_in_tab": false,
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "stockmanager@gmx.de",
      "strict_min_version": "132.0"
    }
  }
}