Examine source code of Article Whisper TTS

{
  "manifest_version": 2,
  "name": "Article Whisper TTS",
  "version": "1.0",
  "description": "Adds a Whisper TTS button on pages with articles.",
  "permissions": [
    "storage",
    "activeTab",
    "https://api.openai.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "Article Whisper TTS",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{37efce61-c47e-43ec-85a6-4a1591496ca6}"
    }
  }
}