Change YouTube homepage grid count (youtube thumbnail resize)

youtubeThumbnailResize.css

/* Credit https://chrome.google.com/webstore/detail/youtube-thumbnail-resizer/pbkkiocccjpeadoiakfbljdbhhdimoac
It's seriously just 1 css rule! 🤯 */
.ytd-rich-grid-renderer {
  --ytd-rich-grid-items-per-row: 6;
}

/* Updated version: https://reddit.com/r/youtube/comments/qwjc10/how_to_display_more_thumbnailsitems_on_youtube/hl4fwty/ */
ytd-rich-grid-renderer {
  --ytd-rich-grid-items-per-row: 6 !important;
}
ytd-rich-grid-renderer > #contents > ytd-rich-grid-row,
ytd-rich-grid-renderer > #contents > ytd-rich-grid-row > #contents {
  display: contents;
}
/* Optional add a bit of right margin */
ytd-rich-item-renderer {
  margin-right: 4px;
  margin-left: 10;
  display: inline-block;
  margin-bottom: 14px;
}