Hide YouTube Shorts - use with the Stylus extension: https://github.com/openstyles/stylus#stylus

hide-youtube-shorts.css

/* Nav item */
a[title="Shorts"],
/* Video shelf in Home and Subscriptions */
ytd-rich-shelf-renderer[is-shorts],
/* Video shelf in Search  */
ytd-reel-shelf-renderer {
  display: none !important;
}

@supports selector(:has(*)) {
  /* "Shorts" chip in Search */
  yt-chip-cloud-chip-renderer:has(yt-formatted-string[title="Shorts"]) {
    display: none !important;
  }
  /* Shorts in search results */
  ytd-video-renderer:has(a[href^="/shorts"]) {
    display: none !important;
  }
}

@supports not selector(:has(*)) {
  /* In Firefox < 121 we just hide the second chip in Search */
  ytd-search iron-selector[id="chips"] yt-chip-cloud-chip-renderer:nth-child(2) {
    display: none !important;
  }
  /* Can't hide Shorts in search results in Firefox < 121 with just CSS ;_; */
}