Examine source code of ElevenLabs TTS Interface

{
  "manifest_version": 2,
  "name": "ElevenLabs TTS Interface (unofficial)",
  "version": "1.1",
  "description": "An unofficial Firefox extension for ElevenLabs text-to-speech integration",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "notifications"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "ElevenLabs TTS Interface (unofficial)",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "play-selected-text": {
      "suggested_key": {
        "default": "Ctrl+Y",
        "mac": "Command+Y"
      },
      "description": "Play selected text using ElevenLabs API.<br><b>Configuration</b><br>1. Click the extension icon in your Firefox toolbar<br>2. Click the 'Settings' button<br>3. Enter your ElevenLabs API key (you can get one from [ElevenLabs](https://elevenlabs.io/))"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{531cc31c-e9a9-400b-a38c-fb6c899dc87d}"
    }
  }
}