Examine source code of SpendLens

{
  "manifest_version": 3,
  "name": "SpendLens",
  "version": "1.0.0",
  "description": "See token count and cost before you send your AI prompt.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://claude.ai/*",
    "https://chat.openai.com/*",
    "https://chatgpt.com/*",
    "https://gemini.google.com/*",
    "https://aistudio.google.com/*",
    "https://poe.com/*",
    "https://perplexity.ai/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*",
        "https://chat.openai.com/*",
        "https://chatgpt.com/*",
        "https://gemini.google.com/*",
        "https://aistudio.google.com/*",
        "https://poe.com/*",
        "https://perplexity.ai/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    }
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "spendlens@boyzliberty360",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}