Examine source code of Claude.ai PromoClock

{
  "manifest_version": 2,
  "name": "PromoClock Overlay",
  "version": "2.4",
  "description": "Overlays most basic PromoClock data on claude.ai",
  "permissions": [
    "tabs",
    "storage",
    "https://promoclock.co/*",
    "https://claude.ai/*"
  ],
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{884d98dd-f660-4631-a5bf-6edcadb9e22c}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}