delayed-dropdown.user.css

/* ==UserStyle==
@name           Philomena Delayed Tag Dropdown
@namespace      https://github.com/marktaiwan/
@version        1.0.0
@author         Marker
==/UserStyle== */

@-moz-document domain("derpibooru.org"), domain("furbooru.org"), domain("ponybooru.org"), domain("ponerpics.org"), domain("twibooru.org") {
.tag.dropdown .dropdown__content {
  display: block;
  overflow-y: hidden;
  max-height: 0vh;
  padding: 0px;
  transition: max-height 0s, padding 0s;
}

.tag.dropdown:hover .dropdown__content {
  transition-delay: 0.5s;
  max-height: 100vh;
}

}