Examine source code of AI Token Tracker

{
  "manifest_version": 2,
  "name": "AI Token Tracker",
  "version": "1.0.0",
  "description": "Track token usage across Claude, ChatGPT, and Gemini in real-time.",
  "author": "AI Token Tracker",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "https://claude.ai/*",
    "https://chatgpt.com/*",
    "https://chat.openai.com/*",
    "https://gemini.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "AI Token Tracker",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "js": [
        "content/claude.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*"
      ],
      "js": [
        "content/chatgpt.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "content/gemini.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ai-token-tracker@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}