Examine source code of Change User-Agent

{
  "manifest_version": 3,
  "name": "Modifier User-Agent",
  "version": "2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd2204fa-fd3e-444c-bd86-d25cdeaa6aaf}"
    }
  },
  "description": "Changer le User-Agent du navigateur",
  "permissions": [
    "webRequest",
    "declarativeNetRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "host_permissions": [
    "<all_urls>"
  ]
}