Examine source code of StockIcon

{
  "manifest_version": 3,
  "name": "StockIcon",
  "version": "1.0.3",
  "description": "Show stock in icon.",
  "icons": {
    "16": "icon.svg",
    "32": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "stock-icon@mantou132"
    }
  },
  "action": {
    "default_icon": {
      "16": "icon.svg",
      "32": "icon.svg",
      "48": "icon.svg",
      "128": "icon.svg"
    },
    "default_title": "StockIcon"
  },
  "options_ui": {
    "page": "options.html"
  },
  "host_permissions": [
    "*://qos.hk/*"
  ],
  "permissions": [
    "alarms",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  }
}