Examine source code of AI Chat Context Window

{
  "manifest_version": 3,
  "name": "AI Chat Context Window",
  "version": "1.1.0",
  "description": "Display context window usage for Claude and ChatGPT interfaces",
  "browser_specific_settings": {
    "gecko": {
      "id": "ai-chat-context@extension",
      "strict_min_version": "121.0"
    }
  },
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "js": [
        "content-scripts/claude.js"
      ],
      "css": [
        "styles/indicator.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://chat.openai.com/*",
        "https://chatgpt.com/*"
      ],
      "js": [
        "content-scripts/chatgpt.js"
      ],
      "css": [
        "styles/indicator.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "wasm/tiktoken_bg.wasm",
        "encodings/o200k_base.json",
        "encodings/claude.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
  },
  "background": {
    "service_worker": "background/sw.js",
    "scripts": [
      "background/event-page.js"
    ],
    "type": "module"
  }
}