uc-tabs-bar.css

/* This Source Code Form is subject to the terms of the Creative Commons
* Attribution-NonCommercial-ShareAlike International License, v. 4.0.
* If a copy of the CC BY-NC-SA 4.0 was not distributed with this
* file, You can obtain one at http://creativecommons.org/licenses/by-nc-sa/4.0/
* or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA. */

/* this controls the general appearance of the tab bar, not individual tabs.
it also controls the all tabs panel since the all tabs button is within the tab bar.
since the window controls and main menu bar are normally part of the titlebar,
this sheet controls their appearance as well. */

#toolbar-menubar[inactive="true"] ~ #TabsToolbar,
#toolbar-menubar:not([inactive="true"]) {
    padding-inline-end: 6px !important;
}

.titlebar-spacer[type="pre-tabs"] {
    display: none;
}

.titlebar-spacer[type="post-tabs"],
#toolbar-menubar > spacer {
    width: var(--titlebar-spacer-width, 32px) !important;
    display: -moz-box !important;
}

/* split the width in half to center the menubar between the tabs and the titlebar buttons */
#toolbar-menubar:not([inactive="true"]) + #TabsToolbar .titlebar-spacer,
#toolbar-menubar:not([inactive="true"]) > spacer {
    width: calc(var(--titlebar-spacer-width, 32px) / 2) !important;
}

#toolbar-menubar:not([inactive="true"]) + #TabsToolbar > .titlebar-buttonbox-container {
    visibility: collapse !important;
}

:root:not([chromehidden~="menubar"], [operatingsystem="linux"], [operatingsystem="macosx"])
    #toolbar-menubar:not([inactive])
    + #TabsToolbar
    .titlebar-spacer {
    display: none;
}

#titlebar {
    -moz-box-orient: horizontal !important;
}

#tabbrowser-tabs {
    background-color: var(--lwt-accent-color) !important;
}

/* menubar next to tabs (merge tabs bar with titlebar menubar and flow them horizontally) */
#toolbar-menubar {
    -moz-box-ordinal-group: 2;
}

#toolbar-menubar[autohide="true"][inactive="true"]:not([customizing="true"]) {
    max-width: 0 !important;
    min-width: 0 !important;
    width: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
    opacity: 0 !important;
}

:root[inFullscreen] #toolbar-menubar {
    visibility: visible !important;
}

:root[inFullscreen] #titlebar {
    background: var(--titlebar-background);
}

#toolbar-menubar[autohide="true"][inactive="true"]:not([customizing="true"]) ~ #TabsToolbar {
    background: var(--titlebar-background);
}

#toolbar-menubar:not([inactive="true"]) {
    background: var(--titlebar-background);
}

/* menubar buttons */
#main-menubar {
    -moz-box-flex: 1 !important;
}

#toolbar-menubar #menubar-items {
    -moz-box-pack: center !important;
}

#main-menubar > menu > menupopup {
    margin-block: calc(
        0px - var(--menupopup-inner-box-margin) - ((var(--tab-min-height) - 16px - 4px - 5px) / 2)
    ) !important;
    margin-inline: calc(0px - var(--menupopup-inner-box-margin) + 2px) !important;
}

#toolbar-menubar #main-menubar > menu {
    appearance: none !important;
    background-color: transparent !important;
    padding-inline: 2px;
}

#toolbar-menubar #main-menubar > menu > label {
    -moz-box-flex: 1000 !important;
    margin: 0 !important;
    padding: 4px 8px 5px 8px !important;
    border-radius: var(--toolbarbutton-border-radius) !important;
}

#toolbar-menubar #main-menubar > menu[_moz-menuactive="true"] > label {
    background-color: var(--toolbarbutton-hover-background) !important;
}

#toolbar-menubar #main-menubar > menu[open] > label {
    background-color: var(--toolbarbutton-active-background) !important;
}

#toolbar-menubar #search-container {
    padding: 0 !important;
    margin: 0 2px !important;
    min-height: 0 !important;
    min-width: var(--uc-menubar-searchbar-width) !important;
    resize: horizontal !important;
    height: 100% !important;
    box-sizing: border-box !important;
}

#toolbar-menubar #searchbar {
    min-height: 28px !important;
    border: none !important;
    box-shadow: none !important;
}

#toolbar-menubar #searchbar .searchbar-search-icon {
    margin-left: 5px !important;
}

#toolbar-menubar .searchbar-textbox {
    min-height: 28px !important;
}

#toolbar-menubar #searchbar .search-go-button {
    border-radius: 0 !important;
    margin: 0 !important;
}

#tabs-newtab-button,
#newPrivateTab-button {
    display: none !important;
}

#new-tab-button,
#privateTab-button {
    display: -moz-box !important;
}

/* get rid of drop shadow drawn on leftmost visible tab */
.tabbrowser-arrowscrollbox > .arrowscrollbox-overflow-start-indicator {
    visibility: collapse !important;
}

/* tab dragging and dropping icon */
.tab-drop-indicator {
    background-image: url(chrome://userchrome/content/tab-drag-indicator.svg) !important;
    -moz-context-properties: fill, fill-opacity, stroke, stroke-opacity !important;
    fill: var(--lwt-toolbarbutton-icon-fill, currentColor) !important;
    margin-bottom: -40px !important;
    z-index: 2500 !important;
    margin-inline-start: -20px !important;
    background-size: contain !important;
    width: 20px !important;
}

#tabbrowser-tabs::after {
    position: relative;
    display: block;
    content: "";
    pointer-events: none;
    box-shadow: 0 0px 14px 0px hsla(0, 0%, 0%, 0.32);
    width: 20px;
    margin-right: -20px;
    height: var(--tab-min-height);
    z-index: 11;
    clip-path: inset(-100% 20px -100% -100%);
}

#tabs-newtab-button {
    padding-left: 4px !important;
    z-index: 1 !important;
    position: relative !important;
}

#tabbrowser-tabs {
    margin-inline-end: 2px !important;
}

:is(toolbarbutton, toolbaritem) + #tabbrowser-tabs {
    margin-inline-start: 2px !important;
}

/* non-overflowing tabs shouldn't draw shadows on new tab button since overflowing tabs don't draw shadows on the special new tab button */
#tabbrowser-tabs:not([overflow]) #tabs-newtab-button {
    z-index: 5 !important;
}

#TabsToolbar .customization-target {
    min-width: 0 !important;
    overflow-x: clip !important;
}

:root:not([sizemode="normal"]) .arrowscrollbox-overflow-end-indicator,
:root:not([sizemode="normal"])
    .tabbrowser-arrowscrollbox
    > .arrowscrollbox-overflow-start-indicator {
    visibility: collapse !important;
}

:is(tabbrowser, #TabsToolbar) toolbarbutton[class^="scrollbutton"] {
    display: none !important;
}

/* hide tab separators */
.tabbrowser-tab::after,
.tabbrowser-tab::before {
    opacity: 0 !important;
    border-image: unset !important;
    border-image-slice: unset !important;
    width: unset !important;
}

.tabbrowser-tab::after,
.tabbrowser-tab::before {
    border-left: none !important;
}

#TabsToolbar
    .toolbarbutton-1
    > :is(.toolbarbutton-icon, .toolbarbutton-text, .toolbarbutton-badge-stack) {
    border-radius: var(--toolbarbutton-border-radius) !important;
}

/* macOS style window controls */
.titlebar-button {
    display: -moz-box !important;
    border: none;
    margin: 0 !important;
    padding: 8px 17px;
    -moz-context-properties: fill, stroke !important;
    stroke: none !important;
    fill: none !important;
}

:root:not([sizemode="maximized"], [inFullscreen]) :is(.titlebar-restore, .uc-titlebar-restore),
:root:is([sizemode="maximized"], [inFullscreen]) :is(.titlebar-max, .uc-titlebar-max) {
    display: none !important;
}

:root:-moz-window-inactive:not([customizing]) .titlebar-buttonbox > toolbarbutton:not(:hover) {
    list-style-image: url(chrome://userchrome/content/window/inactive.svg) !important;
}

.titlebar-buttonbox .toolbarbutton-icon {
    opacity: 1 !important;
}

.titlebar-button > .toolbarbutton-icon {
    appearance: none !important;
    width: 15.3px !important;
    height: 15.3px !important;
    stroke: inherit !important;
}

.titlebar-buttonbox {
    appearance: none !important;
}

.titlebar-max,
.uc-titlebar-max,
.titlebar-restore,
.uc-titlebar-restore {
    appearance: none !important;
    padding: 0px !important;
    padding-left: 7px !important;
    padding-right: 7px !important;
    margin-left: 0px !important;
    margin-right: 0px !important;
    margin-top: 0px !important;
    margin-bottom: 0px !important;
    background-color: transparent !important;
    list-style-image: url(chrome://userchrome/content/window/maximize.svg) !important;
    grid-column: 1 !important;
    order: 1 !important;
    -moz-box-ordinal-group: 1 !important;
}

:is(.titlebar-max, .uc-titlebar-max):hover {
    list-style-image: url(chrome://userchrome/content/window/maximize-hover.svg) !important;
}

:root:is([sizemode="maximized"], [inFullscreen]) :is(.titlebar-max, .uc-titlebar-max):hover,
:is(.titlebar-restore, .uc-titlebar-restore):hover {
    list-style-image: url(chrome://userchrome/content/window/maximize-restore.svg) !important;
}

:is(.titlebar-min, .uc-titlebar-min) {
    appearance: none !important;
    padding: 0px !important;
    padding-left: 7px !important;
    padding-right: 7px !important;
    margin-left: 0px !important;
    margin-right: 0px !important;
    margin-top: 0px !important;
    margin-bottom: 0px !important;
    background-color: transparent !important;
    list-style-image: url(chrome://userchrome/content/window/minimize.svg) !important;
    -moz-box-ordinal-group: 2 !important;
}

:is(.titlebar-min, .uc-titlebar-min):hover {
    list-style-image: url(chrome://userchrome/content/window/minimize-hover.svg) !important;
}

.titlebar-close,
.uc-titlebar-close {
    appearance: none !important;
    padding: 0px !important;
    padding-left: 7px !important;
    padding-right: 7px !important;
    margin-left: 0px !important;
    margin-right: 0px !important;
    margin-top: 0px !important;
    margin-bottom: 0px !important;
    background-color: transparent !important;
    list-style-image: url(chrome://userchrome/content/window/close.svg) !important;
    -moz-box-ordinal-group: 3 !important;
}

:is(.titlebar-close, .uc-titlebar-close):hover {
    list-style-image: url(chrome://userchrome/content/window/close-hover.svg) !important;
}

/* private browsing indicator next to window controls */
.accessibility-indicator,
.private-browsing-indicator {
    height: auto !important;
    width: auto !important;
    padding: 0 var(--toolbarbutton-outer-padding) !important;
    margin: 0 !important;
    background: none !important;
    border: 0 !important;
    outline: 0;
    fill: currentColor !important;
    -moz-context-properties: fill, fill-opacity !important;
    -moz-box-align: center !important;
    -moz-box-pack: center !important;
}

.private-browsing-indicator {
    background: none !important;
}

.private-browsing-indicator::before {
    content: "";
    display: -moz-box;
    width: calc(2 * var(--toolbarbutton-inner-padding) + 16px) !important;
    height: calc(2 * var(--toolbarbutton-inner-padding) + 16px) !important;
    background-image: url(chrome://userchrome/content/skin/privateBrowsing.svg) !important;
    background-size: 16px !important;
    background-position: center !important;
    background-repeat: no-repeat !important;
    padding: var(--toolbarbutton-inner-padding) !important;
    border-radius: var(--toolbarbutton-border-radius) !important;
}

.accessibility-indicator > .button-box {
    width: calc(2 * var(--toolbarbutton-inner-padding) + 16px) !important;
    height: calc(2 * var(--toolbarbutton-inner-padding) + 16px) !important;
    padding: var(--toolbarbutton-inner-padding) !important;
    border-radius: var(--toolbarbutton-border-radius) !important;
}

.accessibility-indicator > .button-box > .button-icon {
    width: 16px !important;
    height: 16px !important;
    list-style-image: url(chrome://userchrome/content/devtools/tool-accessibility.svg) !important;
}

.accessibility-indicator:is(:hover, :focus-visible) > .button-box,
button.private-browsing-indicator:is(:hover, :focus-visible)::before {
    background-color: var(--arrowpanel-dimmed) !important;
}

.accessibility-indicator:is(:hover:active, [open]) > .button-box,
button.private-browsing-indicator:is(:hover:active, [open])::before {
    background-color: var(--arrowpanel-dimmed-further) !important;
}

/* all tabs button popup */
.panel-subview-body > .all-tabs-item {
    border-radius: var(--arrowpanel-menuitem-border-radius) !important;
    box-shadow: none !important;
    margin-inline: 4px !important;
    min-height: 28px !important;
    -moz-box-align: center;
    padding-inline-end: 2px;
}

panelview .all-tabs-button:not([disabled], [open]):focus {
    background: none !important;
}

#allTabsMenu-allTabsViewTabs,
#allTabsMenu-hiddenTabsView > .panel-subview-body {
    margin: var(--panel-subview-body-padding) !important;
    margin-top: 0 !important;
    padding-block: 0 !important;
}

#allTabsMenu-searchTabs {
    list-style-image: url(chrome://global/skin/icons/search-glass.svg) !important;
}

#allTabsMenu-containerTabsButton {
    list-style-image: url(chrome://userchrome/content/skin/container-plus.svg);
}

#allTabsMenu-hiddenTabsButton {
    list-style-image: url(chrome://userchrome/content/hide-password.svg);
}

:is(#allTabsMenu-containerTabsButton, #allTabsMenu-searchTabs, #allTabsMenu-hiddenTabsButton)
    .toolbarbutton-text {
    padding-inline-start: var(--arrowpanel-subviewbutton-iconic-gap, 8px);
}

.all-tabs-item:is([selected], [multiselected], [usercontextid]) .all-tabs-button {
    background-image: linear-gradient(
        to right,
        var(--main-stripe-color) 0,
        var(--main-stripe-color) 4px,
        transparent 4px
    ) !important;
}

.all-tabs-item[selected] {
    font-weight: normal !important;
    background-color: var(--arrowpanel-dimmed-further) !important;
    --main-stripe-color: var(--arrowpanel-dimmed-even-further);
}

.all-tabs-item[usercontextid]:not([multiselected]) {
    --main-stripe-color: var(--identity-tab-color);
}

.all-tabs-item[multiselected] {
    --main-stripe-color: var(--multiselected-color, var(--lwt-selected-tab-background-color));
}

.all-tabs-item:not([selected]):is(:hover, :focus-within, [multiselected]) {
    background-color: var(--arrowpanel-dimmed) !important;
}

.all-tabs-item[multiselected]:not([selected]):hover {
    background-color: var(--arrowpanel-dimmed-further) !important;
}

.all-tabs-item:not([selected]):hover:active {
    background-color: var(--arrowpanel-dimmed-further) !important;
}

.all-tabs-item[pending]:not([selected]):is(:hover, :focus-within, [multiselected]) {
    background-color: var(
        --arrowpanel-faint,
        color-mix(in srgb, var(--arrowpanel-dimmed) 60%, transparent)
    ) !important;
}

.all-tabs-item[pending] > .all-tabs-button {
    opacity: 0.6;
}

:root[italic-unread-tabs] .all-tabs-item[notselectedsinceload]:not([pending]) > .all-tabs-button,
:root[italic-unread-tabs] .all-tabs-item[notselectedsinceload][pending] > .all-tabs-button[busy] {
    font-style: italic !important;
}

.all-tabs-item .all-tabs-secondary-button {
    width: 18px;
    height: 18px;
    border-radius: var(--tab-button-border-radius, 2px) !important;
    color: white !important;
    background-color: transparent !important;
    opacity: 0.7 !important;
    min-height: revert !important;
    min-width: revert !important;
    padding: 0 !important;
}

.all-tabs-secondary-button > .toolbarbutton-icon {
    min-width: 18px !important;
    min-height: 18px !important;
    fill: inherit !important;
    fill-opacity: inherit !important;
    -moz-context-properties: inherit !important;
}

.all-tabs-item .all-tabs-secondary-button > label:empty {
    display: none !important;
}

.all-tabs-item .all-tabs-secondary-button:is(:hover, :focus):not([disabled]),
.all-tabs-item:is(:hover, :focus-within)
    .all-tabs-secondary-button[close-button]:is(:hover, :focus):not([disabled]) {
    background-color: var(--arrowpanel-dimmed) !important;
    opacity: 1 !important;
    color: white !important;
}

.all-tabs-item .all-tabs-secondary-button:hover:active:not([disabled]),
.all-tabs-item:is(:hover, :focus-within)
    .all-tabs-secondary-button[close-button]:hover:active:not([disabled]) {
    background-color: var(--arrowpanel-dimmed-further) !important;
}

.all-tabs-item .all-tabs-secondary-button[toggle-mute] {
    list-style-image: none !important;
    background-image: url(chrome://userchrome/content/audioUnmutedButton.svg) !important;
    background-size: 14px !important;
    background-repeat: no-repeat !important;
    background-position: center !important;
    padding: 0 !important;
    margin-inline-end: 8.5px !important;
    margin-inline-start: -27px !important;
    transition: 0.25s cubic-bezier(0.07, 0.78, 0.21, 0.95) transform,
        0.2s cubic-bezier(0.07, 0.74, 0.24, 0.95) margin, 0.075s linear opacity !important;
    display: block !important;
}

.all-tabs-item .all-tabs-secondary-button[toggle-mute][hidden] {
    transform: translateX(14px);
    opacity: 0 !important;
}

.all-tabs-item:is(:hover, :focus-within) .all-tabs-secondary-button[toggle-mute] {
    transform: translateX(48px);
}

.all-tabs-item .all-tabs-secondary-button[soundplaying] {
    transform: none !important;
    opacity: 0.7 !important;
    margin-inline-start: -2px !important;
}

.all-tabs-item .all-tabs-secondary-button[muted] {
    list-style-image: none !important;
    background-image: url(chrome://userchrome/content/audioMutedButton.svg) !important;
    transform: none !important;
    opacity: 0.7 !important;
    margin-inline-start: -2px !important;
}

.all-tabs-item .all-tabs-secondary-button[activemedia-blocked] {
    list-style-image: none !important;
    background-image: url(chrome://userchrome/content/glyph-play-12.svg) !important;
    background-size: 10px !important;
    background-position: 4.5px center !important;
    transform: none !important;
    opacity: 0.7 !important;
    margin-inline-start: -2px !important;
}

.all-tabs-item:not(:hover, :focus-within) .all-tabs-secondary-button[pictureinpicture] {
    list-style-image: none !important;
    background-image: url(chrome://userchrome/content/tab-picture-in-picture.svg) !important;
    border-radius: 0 !important;
}

.all-tabs-item .all-tabs-secondary-button[pictureinpicture] {
    transform: none !important;
    opacity: 0.7 !important;
    margin-inline-start: -2px !important;
}

.all-tabs-secondary-button[close-button] {
    fill-opacity: 0 !important;
    transform: translateX(14px);
    opacity: 0 !important;
    margin-inline-start: -27px !important;
    transition: 0.25s cubic-bezier(0.07, 0.78, 0.21, 0.95) transform,
        0.2s cubic-bezier(0.07, 0.74, 0.24, 0.95) margin, 0.075s linear opacity;
    display: block !important;
    -moz-context-properties: fill, fill-opacity, stroke !important;
    fill: currentColor !important;
    fill-opacity: 0 !important;
    border-radius: var(--tab-button-border-radius, 2px) !important;
    list-style-image: url(chrome://userchrome/content/textbox-clear.svg) !important;
}

.all-tabs-item:is(:hover, :focus-within) .all-tabs-secondary-button[close-button] {
    transform: none !important;
    opacity: 0.7 !important;
    margin-inline-start: -2px !important;
}

#vertical-tabs-pane
    .all-tabs-item[pinned]:not([muted], [soundplaying], [activemedia-blocked])
    .all-tabs-button
    .toolbarbutton-icon {
    mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"><circle cx="100%" cy="100%" r="9"/></svg>')
            exclude 0/100% 100% no-repeat,
        linear-gradient(#fff, #fff);
    mask-position: 8px 8px;
    transition-property: mask;
    transition-timing-function: ease-in-out;
    transition-duration: calc(var(--pane-transition-duration) / 2);
}

#vertical-tabs-pane[unpinned]:not([expanded])
    .all-tabs-item[pinned]
    .all-tabs-button
    .toolbarbutton-icon {
    mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"><circle cx="100%" cy="100%" r="9"/></svg>')
            exclude 0/100% 100% no-repeat,
        linear-gradient(#fff, #fff);
}

#vertical-tabs-pane[unpinned]
    .all-tabs-item[pinned]:not([muted], [soundplaying], [activemedia-blocked])
    .sound-overlay {
    display: block !important;
    position: absolute;
    left: calc(var(--arrowpanel-menuitem-padding-inline) + 7px) !important;
    top: calc(var(--arrowpanel-menuitem-padding-block) + 8px) !important;
    width: 14px;
    height: 14px;
    -moz-context-properties: fill, fill-opacity;
    fill: currentColor;
    fill-opacity: 0.7 !important;
    opacity: 0;
    pointer-events: none;
    transition-property: opacity;
    transition-timing-function: ease-in-out;
    transition-duration: var(--pane-transition-duration);
    background: url(chrome://userchrome/content/material/pin-45.svg) center/11px no-repeat !important;
}

#vertical-tabs-pane[unpinned]:not([expanded])
    .all-tabs-item[pinned]:not([muted], [soundplaying], [activemedia-blocked])
    .sound-overlay {
    opacity: 1;
    pointer-events: auto;
}

#vertical-tabs-pane[unpinned]
    .all-tabs-item[selected][pinned]:not([muted], [soundplaying], [activemedia-blocked])
    .sound-overlay {
    fill-opacity: inherit !important;
}

.all-tabs-item[pinned] > .all-tabs-button.subviewbutton > .toolbarbutton-text {
    background: url(chrome://userchrome/content/material/pin-45.svg) no-repeat 5px/12px !important;
}

#vertical-tabs-pin-button {
    list-style-image: url(chrome://userchrome/content/material/unpin-315.svg) !important;
}

#vertical-tabs-pane[unpinned] #vertical-tabs-pin-button {
    list-style-image: url(chrome://userchrome/content/material/pin-315.svg) !important;
}

.subviewbutton[command="Browser:OpenAboutContainers"]:not(.subviewbutton-iconic, [image]) {
    list-style-image: url(chrome://userchrome/content/settings.svg) !important;
}

.subviewbutton[command="Browser:OpenAboutContainers"]:not(.subviewbutton-iconic, [image])
    > .toolbarbutton-text {
    padding-inline-start: var(--arrowpanel-subviewbutton-iconic-gap, 8px) !important;
}

/* move titlebar buttons to the left on macOS and linux */
:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) .titlebar-buttonbox-container,
:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    #toolbar-menubar
    > .titlebar-buttonbox-container {
    -moz-box-ordinal-group: 0 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) #toolbar-menubar > spacer,
:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) .titlebar-spacer[type="pre-tabs"] {
    -moz-box-ordinal-group: 1 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) #toolbar-menubar > * {
    -moz-box-ordinal-group: 2 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) #toolbar-menubar {
    -moz-box-ordinal-group: 0 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    :is(.titlebar-min, .uc-titlebar-min) {
    -moz-box-ordinal-group: 2 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    :is(.titlebar-max, .uc-titlebar-max, .titlebar-restore, .uc-titlebar-restore) {
    -moz-box-ordinal-group: 3 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    :is(.titlebar-close, .uc-titlebar-close) {
    -moz-box-ordinal-group: 1 !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) #TabsToolbar,
:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    #toolbar-menubar[inactive="true"]
    ~ #TabsToolbar {
    padding-inline: 4px 3px !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    #toolbar-menubar:not([inactive="true"]) {
    padding-inline: 4px !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) #toolbar-menubar > spacer,
:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) .titlebar-spacer[type="pre-tabs"] {
    width: 8px !important;
    display: -moz-box !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) .titlebar-spacer[type="post-tabs"] {
    display: none !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    #toolbar-menubar:not([inactive="true"])
    > spacer {
    width: 8px !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"])
    #toolbar-menubar:not([inactive="true"])
    + #TabsToolbar
    .titlebar-spacer[type="pre-tabs"] {
    display: none !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]) {
    --titlebar-background: var(--lwt-accent-color) var(--titlebar-gradient-left);
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]):not([inFullscreen])
    #toolbar-menubar[inactive="true"]
    ~ #TabsToolbar {
    background: var(--titlebar-background) !important;
}

:root:is([operatingsystem="macosx"], [operatingsystem="linux"]):not([inFullscreen])
    #toolbar-menubar:not([inactive="true"]) {
    background: var(--titlebar-background);
}

/* move titlebar buttons to the left if user sets the preference for it */
@supports -moz-bool-pref("userChrome.css.titlebar-buttons-on-left") {
    .titlebar-buttonbox-container,
    #toolbar-menubar > .titlebar-buttonbox-container {
        -moz-box-ordinal-group: 0 !important;
    }

    .titlebar-min,
    .uc-titlebar-min {
        -moz-box-ordinal-group: 2 !important;
    }

    .titlebar-max,
    .uc-titlebar-max,
    .titlebar-restore,
    .uc-titlebar-restore {
        -moz-box-ordinal-group: 3 !important;
    }

    .titlebar-close,
    .uc-titlebar-close {
        -moz-box-ordinal-group: 1 !important;
    }

    #toolbar-menubar > spacer,
    .titlebar-spacer[type="pre-tabs"] {
        -moz-box-ordinal-group: 1 !important;
    }

    #toolbar-menubar > * {
        -moz-box-ordinal-group: 2 !important;
    }

    #toolbar-menubar {
        -moz-box-ordinal-group: 0 !important;
    }

    #TabsToolbar,
    #toolbar-menubar[inactive="true"] ~ #TabsToolbar {
        padding-inline: 4px 3px !important;
    }

    #toolbar-menubar:not([inactive="true"]) {
        padding-inline: 4px !important;
    }

    #toolbar-menubar > spacer,
    .titlebar-spacer[type="pre-tabs"] {
        width: 8px !important;
        display: -moz-box !important;
    }

    .titlebar-spacer[type="post-tabs"] {
        display: none !important;
    }

    #toolbar-menubar:not([inactive="true"]) > spacer {
        width: 8px !important;
    }

    #toolbar-menubar:not([inactive="true"]) + #TabsToolbar .titlebar-spacer[type="pre-tabs"] {
        display: none !important;
    }

    :root {
        --titlebar-background: var(--lwt-accent-color) var(--titlebar-gradient-left);
    }

    :root:not([inFullscreen]) #toolbar-menubar[inactive="true"] ~ #TabsToolbar {
        background: var(--titlebar-background) !important;
    }

    :root:not([inFullscreen]) #toolbar-menubar:not([inactive="true"]) {
        background: var(--titlebar-background);
    }
}