Tab Groups styling in Zen

[sameerasw]

.tab-group-label{
  border: none !important;
  border-radius: 1em !important;
  outline: none !important;
  width: 100% !important;
  margin-right: 0 !important;
  transition: all 0.2s ease-in-out !important;
}

.tab-group-label-container::after{
  display: none !important;
}

tab-group .tab-group-label{
  width: 100% !important;
  text-align: left !important;
  padding-left: 10px !important;
  
  &:hover{
    padding-left: 20px !important;
  }
}

tab-group .tab-group-label{
  background: color-mix(in srgb, var(--tab-group-color) 20%, transparent) !important;
  border: color-mix(in srgb, var(--tab-group-color) 50%, transparent) 2px solid !important;
  color: color-mix(in srgb, var(--tab-group-color) 70%, #fff) !important;
  
  &:hover{
    background: color-mix(in srgb, var(--tab-group-color) 50%, transparent) !important;
    color: color-mix(in srgb, var(--tab-group-color) 30%, #fff) !important;
  }
}

tab-group .tab-stack{
  background: color-mix(in srgb, var(--tab-group-color) 20%, transparent) !important;
  margin-block: 2px !important;
  border-radius: 1em !important;
}

.tab-group-label-container{
  margin-bottom: 3px !important;
  margin-top: 3px !important;
}

tab-group .tabbrowser-tab::before{
  display: none !important;
}

#tabbrowser-tabs:not([expanded]){
  tab, tab-group{
    scale: 1.1 !important;
  }
}

[sameerasw]

my-internet/userChrome.css

Lines 508 to 561 in 2840d81

	.tab-group-label{
	border: none !important;
	border-radius: 1em !important;
	outline: none !important;
	width: 100% !important;
	margin-right: 0 !important;
	transition: all 0.2s ease-in-out !important;
	}
	.tab-group-label-container::after{
	display: none !important;
	}
	tab-group .tab-group-label{
	width: 100% !important;
	text-align: left !important;
	padding-left: 10px !important;
	&:hover{
	padding-left: 20px !important;
	}
	}
	tab-group .tab-group-label{
	background: color-mix(in srgb, var(--tab-group-color) 20%, transparent) !important;
	border: color-mix(in srgb, var(--tab-group-color) 50%, transparent) 2px solid !important;
	color: color-mix(in srgb, var(--tab-group-color) 70%, #fff) !important;
	&:hover{
	background: color-mix(in srgb, var(--tab-group-color) 50%, transparent) !important;
	color: color-mix(in srgb, var(--tab-group-color) 30%, #fff) !important;
	}
	}
	tab-group .tab-stack{
	background: color-mix(in srgb, var(--tab-group-color) 20%, transparent) !important;
	margin-block: 2px !important;
	border-radius: 1em !important;
	}
	.tab-group-label-container{
	margin-bottom: 3px !important;
	margin-top: 3px !important;
	}
	tab-group .tabbrowser-tab::before{
	display: none !important;
	}
	#tabbrowser-tabs:not([expanded]){
	tab, tab-group{
	scale: 1.1 !important;
	}
	}

[sameerasw]

Alternative groups style

/*******************************************************************************
 * TAB GROUPS STYLING
 ******************************************************************************/

/* Tab group label styling */
.tab-group-label,
tab-group .tab-group-label {
  width: 100% !important;
  border: none !important;
  border-radius: 1em !important;
  outline: none !important;
  margin-right: 0 !important;
  text-align: left !important;
  padding-left: 10px !important;
  background: color-mix(
    in srgb,
    var(--tab-group-color) 20%,
    transparent
  ) !important;
  color: color-mix(in srgb, var(--tab-group-color) 70%, #fff) !important;
  scale: 1 !important;
  transition: all 0.2s ease-in-out !important;
}
tab-group .tab-group-label:hover {
  padding-left: 15px !important;
  background: color-mix(
    in srgb,
    var(--tab-group-color) 50%,
    transparent
  ) !important;
  color: color-mix(in srgb, var(--tab-group-color) 30%, #fff) !important;
}
tab-group .tab-group-label:active {
  scale: 0.9 !important;
}
tab-group:not([collapsed]) .tab-group-label {
  border: 1.5px dashed
    color-mix(in srgb, var(--tab-group-color) 50%, transparent) !important;
}

/* Label container margins */
.tab-group-label-container {
  margin-top: 3px !important;
  margin-left: 0 !important;
  margin-bottom: 0 !important;
}
tab-group[collapsed] .tab-group-label-container {
  margin-bottom: 3px !important;
}

/* Hide label container's after pseudo */
.tab-group-label-container::after {
  display: none !important;
}

/* Tab stack styles */
.tab-stack,
tab-group .tab-stack {
  transition: all 0.3s ease-in-out !important;
  border-radius: 1.2em !important;
  background: color-mix(
    in srgb,
    var(--tab-group-color) 20%,
    transparent
  ) !important;
  margin-block: 2px !important;
}
.tab-stack:hover,
tab-group .tab-stack:hover {
  background: color-mix(
    in srgb,
    var(--tab-group-color) 50%,
    transparent
  ) !important;
}

/* Hide tab indicator */
tab-group .tabbrowser-tab::before {
  display: none !important;
}

tab-group:not([collapsed=""]) tab, tab-group:not([collapsed=""]) tab .tab-stack, tab-group:not([collapsed=""]) tab .tab-background{
  margin-top: 0 !important;
  margin-bottom: 0 !important;
  border-radius: 0 !important;
}

tab-group:not([collapsed=""]) .tab-stack, tab-group:not([collapsed=""]) .tab-group-label{
  padding-top: 5px !important;
  padding-bottom: 5px !important;
}

tab-group:not([collapsed=""]) .tab-group-label-container, tab-group:not([collapsed=""]) .tab-group-label{
  margin-bottom: 0 !important;
  border-radius: 20px 20px 0 0 !important;
  border: none !important;
  padding-block-end: 0 !important;
}


tab-group:not([collapsed=""]) tab:nth-last-child(1){
  margin-top: 0 !important;
  margin-bottom: 0 !important;
  border-radius: 0 0 20px 20px !important;
}

/* animations */

/* Folder indicator on the tab group label */
/* tab-group > .tab-group-label-container > label.tab-group-label::before {
  content: '📁' !important;
  font-size: 1em !important;
  margin-right: 6px !important;
  display: inline-block !important;
  vertical-align: middle !important;
  transition: transform 0.25s ease-in-out !important;
}

tab-group > .tab-group-label-container > label.tab-group-label[aria-expanded="true"]::before {
  content: '📂' !important;
}
 */