Examine source code of Haru Extension

{
  "manifest_version": 2,
  "name": "Haru Extension",
  "description": "Informe si Haru Stream",
  "version": "1.1",
  "permissions": [
    "notifications"
  ],
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "64": "img/icon_64.png"
  },
  "background": {
    "scripts": [
      "jquery-3.6.0.min.js",
      "background.js"
    ]
  }
}