Extension

content.js

setInterval(() => {
    const player = document.getElementById('movie_player');
    const video = document.querySelector('video');

    if (player && video && player.classList.contains('ad-showing')) {
        video.playbackRate = 16;
    }
}, 50);

manfiest.json

{
  "manifest_version": 3,
  "name": "Name",
  "description": "",
  "version": "1.0",
  "content_scripts": [
    {
      "matches": ["https://www.youtube.com/*"],
      "css": ["styles.css"],
      "js": ["content.js"]
    }
  ]
}

styles.css

ytd-rich-item-renderer:has(ytd-ad-slot-renderer),
ytd-player-legacy-desktop-watch-ads-renderer,
ytd-engagement-panel-section-list-renderer,
ytd-rich-section-renderer,
ytd-ad-slot-renderer {
  display: none !important;
}