Examine source code of Linkable Headers

{
  "manifest_version": 2,
  "name": "Linkable Headers",
  "version": "1.2",
  "description": "Collects the linkable Headers and Links in a page for easier navigation and linking to specific sections of webpages",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "popup/listing.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "List Page POI",
    "default_popup": "popup/listing.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7bbd6b95-b149-4cca-a1c0-11f8ac39080e}"
    }
  }
}