Examine source code of Website Title Display

{
  "manifest_version": 3,
  "name": "Website Title Display",
  "version": "1.0",
  "description": "Displays the title of the website being accessed",
  "browser_specific_settings": {
    "gecko": {
      "id": "website-title-display@example.com"
    }
  },
  "permissions": [
    "tabs"
  ]
}