.config/firefox/chrome/userChrome.css


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/* Hide default tab bar */
#main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
    opacity: 0;
    pointer-events: none;
}
#main-window:not([tabsintitlebar="true"]) #TabsToolbar {
    visibility: collapse !important;
}

/* Hide header of sidebar */
#sidebar-header {
    display: none;
}

/* Make unread tabs italic */
tab-item.unread .label-content {
    font-style: italic;
}