tree-style-tab-theme.css

/* Change color scheme to match EndeavourOS */
/* Make sure to set the theme as `Photon` in the settings */
@media (prefers-color-scheme: dark) {
  :root {
    --tab-border: #2f343f;
    --tabbar-bg: #2f343f;
    --tab-surface-regular: #565965;
    --tab-surface-hover: #496c9a;
    --tab-surface-active: #5294e2;
    --tab-surface-active-hover: #75a9e8;
  }
}

/* Dim unloaded tabs */
.tab.discarded {
    opacity: 0.55;
}

/* Make tab text size smaller */
.label {
  font-size: 0.85em;
  /* letter-spacing: -0.8px; */
}

/* Set tab height */
.tab {
  height: 32px !important;
}

/* Remove favicons */
tab-item:not(.faviconized):not(.loading) tab-favicon {
  display: none;
}