Examine source code of Proxy Manager Vesna

{
  "manifest_version": 2,
  "name": "Proxy Manager Vesna",
  "version": "1.0",
  "description": "Переключает прокси и показывает текущий IP + страну",
  "icons": {
    "48": "icons/proxy-48.png",
    "96": "icons/proxy-96.png"
  },
  "permissions": [
    "proxy",
    "storage",
    "notifications",
    "https://api.ipify.org/",
    "https://ipapi.co/",
    "https://t.me/"
  ],
  "browser_action": {
    "default_icon": "icons/proxy-32.png",
    "default_title": "Proxy Manager",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{4f012c23-441c-4e0f-8baf-988abd70d060}"
    }
  }
}