A fix for this Quick Tabs theme: https://github.com/babyman/quick-tabs-chrome-extension/blob/master/3rdParty/css/chrome-lookalike.css

quick-tabs-chrome-theme-fixed.css

body {
  font-family: -apple-system, "system-ui", Inter, "Segoe UI", Roboto, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", Helvetica, Arial, sans-serif;
}

.qs_input {
  padding: 18px 6px 18px 16px;
  border-bottom: none;
}

.item {
  padding-top: 12px;
  padding-bottom: 12px;
  padding-left: 12px;
  border-bottom: none;
}

div.tabimage img {
  margin: 2px 12px 0 0;
  width: 20px;
  height: 20px;
}

div.close {
  background-size: 16px 16px;
}

div.title {
  padding-top: 0px;
  padding-bottom: 2px;
  color: #212121 !important;
}

div.url {
  font-size: 11px;
  color: #4c565a!important;
}

div.title, div.url {
  padding-right: 6px;
}

.item:hover, .item:hover div.title, div.closed.item:hover div.title, .item:hover div.url {
    background-color: #eee;
    color: white;
}

.withfocus:hover, .withfocus:hover div.title, div.closed.withfocus:hover div.title, .withfocus:hover div.url, .withfocus, .withfocus div.title, div.closed.withfocus div.title, .withfocus div.url {
    background-color: #d4d4d4;
  color: black;
}

.item b {
  /*color: #212121;*/
  text-decoration: none !important;
}

.withfocus b {
    color: #212121;
}

.item:hover .title b {
    color: #212121;
}

.item:hover .url b {
    color: #4c565a;
}

div.close {
  position: relative;
  border-radius: 12px;
  height: 24px;
  width: 24px;
  margin-top: 3px;
  margin-right: 12px;
  background: transparent;
}

div.close:hover {
  background:  #bbb;
}

div.close:before {
  position: absolute;
  content:  '×';
  font-weight: 600;
  font-size: 15px;
  top: 2px;
  left: 7px;
}


div.open:hover div.close, div.withfocus.open div.close {
    color: black;
}