Examine source code of Listenify

{
  "manifest_version": 2,
  "name": "Listenify",
  "version": "0.1.2",
  "description": "Transform selected text into audio using ChatGPT TTS with a modern floating player and live highlighting.",
  "icons": {
    "48": "src/assets/icon-48.png",
    "96": "src/assets/icon-96.png",
    "128": "src/assets/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "src/assets/icon-48.png"
    },
    "default_title": "Listenify",
    "default_popup": "src/popup/popup.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "downloads",
    "https://api.openai.com/*"
  ],
  "background": {
    "scripts": [
      "src/background/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/common/i18n.js",
        "src/content/listenify.js"
      ],
      "css": [
        "src/content/listenify.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8225f8a-f915-463e-bb64-b049687b353e}"
    }
  }
}