Examine source code of Claude Usage Widget

{
  "manifest_version": 2,
  "name": "Claude Usage Widget",
  "version": "1.0",
  "description": "Display Claude usage directly on the page",
  "permissions": [
    "https://claude.ai/*",
    "webRequest",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aba3c02f-ccc9-4ac8-b518-81a35d809216}"
    }
  }
}