Examine source code of Toggle YouTube Speed

{
  "manifest_version": 3,
  "name": "YouTube Speed Toggle",
  "version": "1.0",
  "description": "Toggle between 1.5x and 2.0x playback speed on YouTube with 'S' key or Ctrl+Shift+S. Speed persists across page refreshes.",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-speed-toggle@pulkitguleria",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "scripting",
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_title": "YouTube Speed Toggle - Press 'S' to toggle speed",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}