Examine source code of Undetectable Converter

{
  "background": {
    "scripts": [
      "js/undetectable.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "images/48x48.png",
    "default_popup": "popup.html",
    "default_title": "Undetectable"
  },
  "description": "Send your cookies to Undetectable browser.",
  "homepage_url": "https://undetectable.io",
  "icons": {
    "16": "images/16x16.png",
    "48": "images/48x48.png",
    "128": "images/128x128.png"
  },
  "manifest_version": 2,
  "name": "Undetectable",
  "permissions": [
    "http://*/",
    "https://*/",
    "cookies"
  ],
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e92ce6c4-84a8-4158-8f69-c36a09360765}"
    }
  }
}