.tabbrowser-tab .tab-icon-image {
 display: inherit !important;
 max-width: 16px !important;
 max-height: 16px !important;
}

.tabbrowser-tab:not([selected="true"]) .tab-icon-image {
 margin: -1px 6px 0 0 !important;
}

.tabbrowser-tab[selected="true"] .tab-icon-image {
 margin: -3px 2px 0 4px !important;
}