Examine source code of Temp Mail by Smailpro

{
  "manifest_version": 3,
  "name": "Temp Mail by Smailpro",
  "description": "Instantly create a temporary email address to protect you from spam, phishing and malware. No commitments and no risks.",
  "version": "1.1",
  "author": "Sonjj",
  "browser_specific_settings": {
    "gecko": {
      "id": "{ed95682b-5071-468b-89ca-b2853e93e845}"
    }
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "20": "icons/logo-20.png",
      "40": "icons/logo-40.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [],
  "content_security_policy": {
    "script-src": "self",
    "object-src": "self"
  }
}