Examine source code of Port Checker Tool

{
  "browser_action": {
    "default_icon": "32x32.png",
    "default_popup": "popup.html",
    "default_title": "Port Checker Tool"
  },
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "description": "Port Checker Tool",
  "icons": {
    "128": "128x128.png"
  },
  "manifest_version": 2,
  "name": "Port Checker Tool",
  "permissions": [
    "notifications",
    "tabs",
    "unlimitedStorage",
    "https://chat.9705222.ru/*"
  ],
  "version": "1.0.0"
}