Examine source code of Avannubo

{
  "manifest_version": 3,
  "short_name": "Avannubo Extension",
  "description": "Es una potente extensión de navegador que te permite gestionar tus contraseñas de manera segura y eficiente.",
  "version": "1.1",
  "name": "Avannubo",
  "icons": {
    "48": "assets/icon.png",
    "96": "assets/icon.png"
  },
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "permissions": [
    "tabs",
    "scripting",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@avannubo.com"
    }
  },
  "action": {
    "default_icon": {
      "48": "assets/icon.png",
      "96": "assets/icon.png"
    },
    "default_popup": "index.html",
    "default_title": "Password manager"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "index.html"
      ],
      "matches": [
        "https://*/*",
        "http://*/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}