Examine source code of Usage in Bookmarks for Claude

{
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  "name": "Usage in Bookmarks for Claude",
  "version": "1.5.0",
  "description": "Keeps your Claude.ai usage limits on the bookmarks toolbar, refreshed in the background. Not affiliated with Anthropic.",
  "homepage_url": "https://github.com/kvachikk/usage-in-bookmarks-for-claude",
  "browser_specific_settings": {
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      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "bookmarks",
    "alarms",
    "storage"
  ],
  "host_permissions": [
    "https://claude.ai/*"
  ],
  "background": {
    "scripts": [
      "lib/usage.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
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  },
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    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Claude usage — click to refresh now",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  }
}