Examine source code of 2X Speed

{
  "manifest_version": 3,
  "name": "2X Speed",
  "description": "An extension that instantly speeds up a youtube video playback at the press of a button.",
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "2xspeed@riadh.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "scripting",
    "tabs",
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": "yaaaa.png"
  }
}