Examine source code of Domain in Title

{
  "manifest_version": 2,
  "name": "Domain in Title",
  "version": "1.2resigned1",
  "description": "Add the domain to the page title",
  "icons": {
    "48": "icons/window.svg",
    "96": "icons/window.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "domaintitle.js"
      ],
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "57.0",
      "id": "{966515fa-4c81-4afe-9879-9bbaf8576390}"
    }
  }
}