Examine source code of Free Temp Mail Service

{
  "name": "Free Temp Mail Service",
  "description": "Create unlimited temp mail adresses to receive emails from any site without using your personal email we made this extension to avoid spam in your personal mailbox.",
  "version": "4.1",
  "manifest_version": 2,
  "author": "https://www.tempinbox.xyz",
  "icons": {
    "16": "icons/img16.png",
    "32": "icons/img32.png",
    "48": "icons/img48.png",
    "128": "icons/img128.png"
  },
  "permissions": [
    "https://*.tempinbox.xyz/*"
  ],
  "browser_action": {
    "32": "icons/img32.png",
    "48": "icons/img48.png",
    "128": "icons/img128.png",
    "default_icon": "/icons/img16.png",
    "default_popup": "home.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8ef160b-0381-443e-b125-48fd7e657038}"
    }
  }
}