Examine source code of claude-limits-tracker

{
  "manifest_version" : 3 ,
  "name" : "Claude Usage Tracker",
  "version" : "1.0.0",
  "description" : "A sticky, draggable widget that mirrors your Claude.ai usage limits (session, all models, Opus) at a glance.",
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "96" : "icons/icon-96.png",
    "128" : "icons/icon-128.png"
  },
  "permissions" : [
    "storage" 
  ],
  "host_permissions" : [
    "*://claude.ai/*" ,
    "*://*.claude.ai/*" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "*://claude.ai/*" ,
        "*://*.claude.ai/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_idle" ,
      "all_frames" : false 
    }
  ],
  "web_accessible_resources" : [
    {
      "resources" : [
        "widget.css" 
      ],
      "matches" : [
        "*://claude.ai/*" ,
        "*://*.claude.ai/*" 
      ]
    }
  ],
  "action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png",
      "48" : "icons/icon-48.png",
      "96" : "icons/icon-96.png"
    },
    "default_title" : "Claude Usage Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "claude-usage-tracker@mouad.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}