%if 0
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
%endif
%filter substitution
%define horizontalTabPadding 9px

:root {
  --tab-min-height: 33px;
}

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
:root {
  --tab-min-height: calc(1.2em + 1.7em); /* line-heights of both lines of text when visible */
  --proton-tab-radius: 4px;
  --proton-shadow-blur-radius: 6px;
  --proton-tab-block-margin: 2px;
}
} /*** END proton ***/

:root[uidensity=compact] {
  --tab-min-height: 29px;
}

:root[uidensity=touch] {
  --tab-min-height: 41px;
}

#tabbrowser-tabs {
  --tabs-top-border-width: 0px;
  --tab-min-width: 76px;
  --tab-loading-fill: #0A84FF;
}

#tabbrowser-tabs:-moz-lwtheme {
  --tab-line-color: currentColor;
}

#tabbrowser-tabpanels {
  /* Value for --in-content-page-background in in-content/common.inc.css */
  background-color: #f9f9fa;
}

:root[privatebrowsingmode=temporary] #tabbrowser-tabpanels {
  /* Value for --in-content-page-background in aboutPrivateBrowsing.css */
  background-color: #25003e;
}

@media (prefers-color-scheme: dark) {
  #tabbrowser-tabpanels {
    /* Value for --in-content-page-background for dark mode in in-content/common.inc.css */
    background-color: #2A2A2E;
  }
}

#tabbrowser-tabs,
#tabbrowser-arrowscrollbox,
#tabbrowser-tabs[positionpinnedtabs] > #tabbrowser-arrowscrollbox > .tabbrowser-tab[pinned] {
  min-height: var(--tab-min-height);
}

.tab-stack {
  min-height: inherit;
}

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
#tabbrowser-arrowscrollbox::part(scrollbox) {
  /* Add padding to match the shadow's blur radius so the
    shadow doesn't get clipped when either the first or
    last tab is selected */
  padding-inline: var(--proton-shadow-blur-radius);
}
} /*** END proton ***/

@supports -moz-bool-pref("layout.css.emulate-moz-box-with-flex") {
  .tab-stack {
    /* Needed to allow tabs to shrink to be skinnier than their page-title: */
    min-width: 0;
  }

  #tabbrowser-arrowscrollbox::part(scrollbox) {
    /* Needed to prevent tabstrip from growing as wide as the sum of the tabs'
       page-title widths (when we'd rather have it be as wide as the window and
       compress the tabs to their minimum size): */
    max-width: 100%;
  }
}

.tabbrowser-tab {
  appearance: none;
  background-color: transparent;
  border-radius: 0;
  border-width: 0;
  margin: 0 !important /* override tabbox.css */;
  padding: 0 !important /* override tabbox.css */;
  -moz-box-align: stretch;
}

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
.tabbrowser-tab {
  border-radius: var(--proton-tab-radius);
  min-height: var(--tab-min-height);
}
} /*** END proton ***/

/* The selected tab should appear above the border between the tabs toolbar and
   the navigation toolbar. */
.tabbrowser-tab[visuallyselected=true] {
  position: relative;
  z-index: 2;
}

.tab-content {
  padding: 0 @horizontalTabPadding@;
}

:root:not([uidensity=compact]) .tab-content[pinned] {
  padding: 0 12px;
}

@media (prefers-reduced-motion: no-preference) {
  :root[sessionrestored] .tab-loading-burst {
    position: relative;
    overflow: hidden;
  }

  :root[sessionrestored] .tab-loading-burst::before {
    position: absolute;
    content: "";
    /* We set the width to be a percentage of the tab's width so that we can use
       the `scale` transform to scale it up to the full size of the tab when the
       burst occurs. We also need to set the margin-inline-start so that the
       center of the burst matches the center of the favicon. */
    width: 5%;
    height: 100%;
    /* Center the burst over the .tab-loading-burst; it's 9px from the edge thanks
       to .tab-content, plus 8px more since .tab-loading-burst is 16px wide. */
    margin-inline-start: calc(17px - 2.5%);
  }

  :root[sessionrestored] .tab-loading-burst[pinned]::before {
    /* This is like the margin-inline-start rule above, except that icons for
       pinned tabs are 12px from the edge. */
    margin-inline-start: calc(20px - 2.5%);
  }

  :root[sessionrestored] .tab-loading-burst[bursting]::before {
    background-image: url("chrome://browser/skin/tabbrowser/loading-burst.svg");
    background-position: center center;
    background-size: 100% auto;
    background-repeat: no-repeat;
    animation: tab-burst-animation 375ms cubic-bezier(0,0,.58,1);
    -moz-context-properties: fill;
    fill: var(--tab-loading-fill);
  }

  :root[sessionrestored] .tab-loading-burst[bursting][notselectedsinceload]::before {
    animation-name: tab-burst-animation-light;
  }

  @keyframes tab-burst-animation {
    0% {
      opacity: 0.4;
      transform: scale(1);
    }
    100% {
      opacity: 0;
      transform: scale(40);
    }
  }

  @keyframes tab-burst-animation-light {
    0% {
      opacity: 0.2;
      transform: scale(1);
    }
    100% {
      opacity: 0;
      transform: scale(40);
    }
  }
}

.tab-throbber,
.tab-icon-pending,
.tab-icon-image,
.tab-sharing-icon-overlay,
.tab-close-button {
  margin-top: 1px;
}

@supports not -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-icon-sound {
  margin-top: 1px;
}
} /*** END !proton ***/

.tab-throbber,
.tab-throbber-tabslist,
.tab-icon-pending,
.tab-icon-image,
.tab-sharing-icon-overlay {
  height: 16px;
  width: 16px;
}

.tab-throbber:not([pinned]),
.tab-sharing-icon-overlay:not([pinned]),
.tab-icon-pending:not([pinned]),
.tab-icon-image:not([pinned]) {
  margin-inline-end: 6px;
}

@media (prefers-reduced-motion: reduce) {
  .tab-throbber[busy] {
    background-image: url("chrome://browser/skin/tabbrowser/hourglass.svg");
    background-position: center;
    background-repeat: no-repeat;
    -moz-context-properties: fill;
    fill: currentColor;
    opacity: 0.4;
  }

  .tab-throbber[progress] {
    opacity: 0.8;
  }
}

@media (prefers-reduced-motion: no-preference) {
  :root[sessionrestored] .tab-throbber[busy] {
    position: relative;
    overflow: hidden;
  }

  :root[sessionrestored] .tab-throbber[busy]::before {
    content: "";
    position: absolute;
    background-image: url("chrome://browser/skin/tabbrowser/loading.svg");
    background-position: left center;
    background-repeat: no-repeat;
    width: 480px;
    height: 100%;
    animation: tab-throbber-animation 1.05s steps(30) infinite;
    -moz-context-properties: fill;

    /* XXX: It would be nice to transition between the "connecting" color and the
       "loading" color (see the `.tab-throbber[progress]::before` rule below);
       however, that currently forces main thread painting. When this is fixed
       (after WebRender lands), we can do something like
       `transition: fill 0.333s, opacity 0.333s;` */

    fill: currentColor;
    opacity: 0.7;
  }

  :root[sessionrestored] .tab-throbber[busy]:-moz-locale-dir(rtl)::before {
    animation-name: tab-throbber-animation-rtl;
  }

  @keyframes tab-throbber-animation {
    0% { transform: translateX(0); }
    100% { transform: translateX(-100%); }
  }

  @keyframes tab-throbber-animation-rtl {
    0% { transform: translateX(0); }
    100% { transform: translateX(100%); }
  }

  #TabsToolbar[brighttext] .tab-throbber[busy]:not([selected=true])::before {
    /* Don't change the --tab-loading-fill variable because this should only affect
       tabs that are not visually selected. */
    fill: #717171;
    opacity: 1;
  }

  :root[sessionrestored] .tab-throbber[progress]::before {
    fill: var(--tab-loading-fill);
    opacity: 1;
  }

  #TabsToolbar[brighttext] .tab-throbber[progress]:not([selected=true])::before {
    /* Don't change the --tab-loading-fill variable because this should only affect
       tabs that are not visually selected. */
    fill: #84c1ff;
  }
}

.tab-icon-image {
  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.svg");
  -moz-context-properties: fill;
  fill: currentColor;
}

.tab-icon-image[sharing]:not([selected]),
.tab-sharing-icon-overlay {
  animation: 3s linear tab-sharing-icon-pulse infinite;
}

@keyframes tab-sharing-icon-pulse {
  0%, 16.66%, 83.33%, 100% {
    opacity: 0;
  }
  33.33%, 66.66% {
    opacity: 1;
  }
}

.tab-icon-image[sharing]:not([selected]) {
  animation-delay: -1.5s;
}

.tab-sharing-icon-overlay {
  /* 16px of the icon + 6px of margin-inline-end of .tab-icon-image */
  margin-inline-start: -22px;
  position: relative;
  -moz-context-properties: fill;
  fill: rgb(224, 41, 29);
}

.tab-sharing-icon-overlay[pinned] {
  margin-inline-start: -16px;
}

.tab-sharing-icon-overlay[sharing="camera"] {
  list-style-image: url("chrome://browser/skin/notification-icons/camera.svg");
}

.tab-sharing-icon-overlay[sharing="microphone"] {
  list-style-image: url("chrome://browser/skin/notification-icons/microphone.svg");
}

.tab-sharing-icon-overlay[sharing="screen"] {
  list-style-image: url("chrome://browser/skin/notification-icons/screen.svg");
}

.tab-icon-overlay {
  width: 16px;
  height: 16px;
  margin-top: -8px;
  margin-inline: -15px -1px;
  position: relative;
}

.tab-icon-overlay[pinned] {
  margin-inline: -6px -10px;
}

.tab-icon-overlay[crashed] {
  list-style-image: url("chrome://browser/skin/tabbrowser/crashed.svg");
}

.tab-icon-overlay[soundplaying],
.tab-icon-overlay[muted]:not([crashed]),
.tab-icon-overlay[activemedia-blocked]:not([crashed]) {
  border-radius: 10px;
  -moz-context-properties: fill;
  fill: currentColor;
}

.tab-icon-overlay[soundplaying]:hover,
.tab-icon-overlay[muted]:not([crashed]):hover,
.tab-icon-overlay[activemedia-blocked]:not([crashed]):hover {
  background-color: white;
  color: black;
}

.tab-icon-overlay[soundplaying] {
  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-playing-small.svg");
}

.tab-icon-overlay[muted]:not([crashed]) {
  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-muted-small.svg");
}

.tab-icon-overlay[activemedia-blocked]:not([crashed]) {
  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-blocked-small.svg");
}

@media (prefers-reduced-motion: reduce) {
  .tab-throbber-tabslist[busy] {
    list-style-image: url("chrome://browser/skin/tabbrowser/hourglass.svg");
    -moz-context-properties: fill;
    fill: currentColor;
    opacity: 0.4;
  }

  .tab-throbber-tabslist[progress] {
    opacity: 0.8;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .tab-throbber-tabslist[busy] {
    list-style-image: url("chrome://browser/skin/tabbrowser/tab-connecting.png");
  }

  .tab-throbber-tabslist[progress] {
    list-style-image: url("chrome://browser/skin/tabbrowser/tab-loading.png");
  }

  :root[lwt-popup-brighttext] .tab-throbber-tabslist[progress]:not([selected=true]) {
    list-style-image: url("chrome://browser/skin/tabbrowser/tab-loading-inverted.png");
  }

  @media (min-resolution: 1.1dppx) {
    .tab-throbber-tabslist[busy] {
      list-style-image: url("chrome://browser/skin/tabbrowser/tab-connecting@2x.png");
    }

    .tab-throbber-tabslist[progress] {
      list-style-image: url("chrome://browser/skin/tabbrowser/tab-loading@2x.png");
    }

    :root[lwt-popup-brighttext] .tab-throbber-tabslist[progress]:not([selected=true]) {
      list-style-image: url("chrome://browser/skin/tabbrowser/tab-loading-inverted@2x.png");
    }
  }
}

.tab-label {
  margin-inline: 0;
  /* Maintain consistent alignment in case of font fallback for non-Latin characters. */
  line-height: 1.7em;
}

.tab-close-button {
  margin-inline-end: -2px;
  -moz-context-properties: fill, fill-opacity, stroke-opacity;
  stroke-opacity: var(--toolbarbutton-icon-fill-opacity);
}

:root[uidensity=touch] .tab-close-button {
  margin-inline-end: -@horizontalTabPadding@;
  padding: 10px calc(@horizontalTabPadding@ - 2px);
}

@supports not -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-label-container.proton {
  display: none;
}

.tab-icon-sound {
  margin-inline-start: 1px;
  width: 16px;
  height: 16px;
  padding: 0;
  -moz-context-properties: fill;
  fill: currentColor;
}
} /*** END !proton ***/

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-label-container:not(.proton),
.tab-label-container:not(.proton) + .tab-icon-sound {
  display: none;
}

.tab-icon-sound {
  font-size: .9em;
  line-height: 1.2em;
  -moz-box-align: center;
}

.tab-icon-sound-image {
  margin-block: 1px;
  width: 16px;
  height: 16px;
  padding: 0;
  -moz-context-properties: fill;
  fill: currentColor;
}
} /*** END proton ***/

@supports not -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-icon-sound[soundplaying],
.tab-icon-sound[muted],
.tab-icon-sound[activemedia-blocked] {
  list-style-image: url(chrome://browser/skin/tabbrowser/tab-audio-playing.svg);
}

.tab-icon-sound[muted] {
  list-style-image: url(chrome://browser/skin/tabbrowser/tab-audio-muted.svg);
}
} /*** END !proton ***/

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-icon-sound[soundplaying],
.tab-icon-sound[muted],
.tab-icon-sound[activemedia-blocked] {
  list-style-image: url(chrome://browser/skin/tabbrowser/proton-tab-audio-playing.svg);
}

.tab-icon-sound[muted] {
  list-style-image: url(chrome://browser/skin/tabbrowser/proton-tab-audio-muted.svg);
}
} /*** END proton ***/

.tab-icon-sound[activemedia-blocked] {
  list-style-image: url(chrome://browser/skin/tabbrowser/tab-audio-blocked.svg);
}

.tab-icon-sound[pictureinpicture] {
  list-style-image: url(chrome://global/skin/media/pictureinpicture.svg);
  width: 14px;
  height: 14px;
  opacity: .8;
}

.tab-icon-sound[pictureinpicture]:-moz-locale-dir(rtl) {
  transform: scaleX(-1);
}

:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-darktext[pictureinpicture],
:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-darktext[soundplaying],
:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-darktext[muted],
:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-darktext[activemedia-blocked] {
  filter: drop-shadow(1px 1px 1px white);
}

:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-brighttext[pictureinpicture],
:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-brighttext[soundplaying],
:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-brighttext[muted],
:root[lwtheme-image] .tab-icon-sound:-moz-lwtheme-brighttext[activemedia-blocked] {
  filter: drop-shadow(1px 1px 1px black);
}

.tab-icon-sound[soundplaying]:not(:hover),
.tab-icon-sound[muted]:not(:hover),
.tab-icon-sound[activemedia-blocked]:not(:hover) {
  opacity: .8;
}

.tab-icon-sound[soundplaying-scheduledremoval]:not([muted], :hover),
.tab-icon-overlay[soundplaying-scheduledremoval]:not([muted], :hover) {
  transition: opacity .3s linear var(--soundplaying-removal-delay);
  opacity: 0;
}

.tab-icon-sound[muted] > .tab-icon-sound-playing-label,
.tab-icon-sound:not([muted]) > .tab-icon-sound-muted-label {
  display: none;
}

/* Tab Overflow */
#tabbrowser-arrowscrollbox:not([scrolledtostart])::part(overflow-start-indicator),
#tabbrowser-arrowscrollbox:not([scrolledtoend])::part(overflow-end-indicator) {
  width: 18px;
  background-image: url(chrome://browser/skin/tabbrowser/tab-overflow-indicator.png);
  background-size: 17px 100%;
  background-repeat: no-repeat;
  border-left: 1px solid;
  border-image: linear-gradient(rgba(255,255,255,.2),
                                rgba(255,255,255,.2) calc(100% - 1px - var(--tabs-navbar-shadow-size)),
                                transparent calc(100% - 1px - var(--tabs-navbar-shadow-size)));
  border-image-slice: 1;
  pointer-events: none;
  position: relative;
  z-index: 3; /* the selected tab's z-index + 1 */
}

#tabbrowser-arrowscrollbox:-moz-locale-dir(rtl)::part(overflow-start-indicator),
#tabbrowser-arrowscrollbox:-moz-locale-dir(ltr)::part(overflow-end-indicator) {
  transform: scaleX(-1);
}

#tabbrowser-arrowscrollbox:not([scrolledtostart])::part(overflow-start-indicator) {
  margin-inline: -1px -17px;
}

#tabbrowser-arrowscrollbox:not([scrolledtoend])::part(overflow-end-indicator) {
  margin-inline: -17px -1px;
}

#tabbrowser-arrowscrollbox[scrolledtostart]::part(overflow-start-indicator),
#tabbrowser-arrowscrollbox[scrolledtoend]::part(overflow-end-indicator) {
  opacity: 0;
}

#tabbrowser-arrowscrollbox::part(overflow-start-indicator),
#tabbrowser-arrowscrollbox::part(overflow-end-indicator) {
  transition: opacity 150ms ease;
}

.tabbrowser-tab:not([visuallyselected=true], [multiselected]),
.tabbrowser-tab:-moz-lwtheme {
  color: inherit;
}

.tabbrowser-tab[multiselected]:-moz-lwtheme,
.tabbrowser-tab[visuallyselected=true]:-moz-lwtheme {
  color: var(--lwt-tab-text, var(--toolbar-color));
}

.tab-line {
  height: 2px;
}

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-line {
  display: none;
}
} /*** END proton ***/

/* Selected tab */

.tab-background {
  border: 1px none transparent;
  background-clip: padding-box;
}

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
.tab-background {
  border-radius: var(--proton-tab-radius);
  margin-block: var(--proton-tab-block-margin);
}

:root[sizemode=maximized] .tabbrowser-tab {
  margin-top: 0 !important;
}

.tabbrowser-tab[visuallyselected=true] > .tab-stack > .tab-background {
  box-shadow: 0 2px var(--proton-shadow-blur-radius) rgba(58,57,68,.2);
}
} /*** END proton ***/

%ifdef MENUBAR_CAN_AUTOHIDE
#toolbar-menubar:not([autohide=true]) + #TabsToolbar,
%endif
:root:not([tabsintitlebar]),
:root[extradragspace] {
  --tabs-top-border-width: 1px;
}

%ifdef MENUBAR_CAN_AUTOHIDE
#toolbar-menubar:not([autohide=true]) + #TabsToolbar .tabbrowser-tab > .tab-stack > .tab-background,
%endif
:root:not([tabsintitlebar]) .tab-background,
:root[extradragspace] .tab-background {
  border-top-style: solid;
}

.tab-background[multiselected=true],
.tab-background[selected=true] {
  border-top-color: var(--tabs-border-color);
  background-color: var(--toolbar-bgcolor);
  background-image: var(--toolbar-bgimage);
  background-repeat: repeat-x;
}

/* Add a translucent color on top of multiselected tabs */
.tab-background[multiselected=true]:not([selected=true]) > .tab-background-inner {
  background: currentColor;
  opacity: .1;
}

.tab-line[multiselected],
.tab-line[selected=true] {
  background-color: var(--tab-line-color);
}

/*
 * LightweightThemeConsumer will set the current lightweight theme's header
 * image to the lwt-header-image variable, used in each of the following rulesets.
 */

/* Lightweight theme on tabs */
#tabbrowser-tabs:not([movingtab]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab > .tab-stack > .tab-background[multiselected=true]:-moz-lwtheme,
#tabbrowser-tabs:not([movingtab]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab > .tab-stack > .tab-background[selected=true]:-moz-lwtheme {
  background-attachment: scroll, scroll, fixed;
  background-color: transparent;
  background-image: linear-gradient(var(--lwt-selected-tab-background-color, transparent), var(--lwt-selected-tab-background-color, transparent)),
                    linear-gradient(var(--toolbar-bgcolor), var(--toolbar-bgcolor)),
                    var(--lwt-header-image, none);
  background-position: 0 0, 0 0, right top;
  background-repeat: repeat-x, repeat-x, no-repeat;
  background-size: auto 100%, auto 100%, auto auto;
}

/* Tab hover */

.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true], [multiselected]) {
  background-color: rgba(0,0,0,.1);
}

#TabsToolbar[brighttext] .tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true], [multiselected]) {
  background-color: rgba(255,255,255,.1);
}

@media (prefers-reduced-motion: no-preference) {
  .tab-line:not([selected=true], [multiselected]) {
    transition: transform 250ms var(--animation-easing-function), opacity 250ms var(--animation-easing-function);
  }
}

.tab-line:not([selected=true], [multiselected]) {
  opacity: 0;
  transform: scaleX(0);
}

.tabbrowser-tab:hover > .tab-stack > .tab-background > .tab-line:not([selected=true], [multiselected]) {
  background-color: rgba(0,0,0,.2);
  opacity: 1;
  transform: none;
}

#TabsToolbar[brighttext] .tabbrowser-tab:hover > .tab-stack > .tab-background > .tab-line:not([selected=true], [multiselected]) {
  background-color: rgba(255,255,255,.2);
}

.tabbrowser-tab:hover > .tab-stack > .tab-background > .tab-line[multiselected]:not([selected=true]) {
  opacity: 0.5;
}

/* Pinned tabs */

/* Pinned tab separators need position: absolute when positioned (during overflow). */
#tabbrowser-tabs[positionpinnedtabs] > #tabbrowser-arrowscrollbox > .tabbrowser-tab[pinned]::after {
  display: block;
  position: absolute;
  inset-block: 0;
  inset-inline-end: 0;
}

#tabbrowser-tabs[positionpinnedtabs] > #tabbrowser-arrowscrollbox > .tabbrowser-tab[pinned] > .tab-stack {
  border-inline-end: 1px solid transparent;
}

.tabbrowser-tab:is([image], [pinned]) > .tab-stack > .tab-content[attention]:not([selected="true"]),
.tabbrowser-tab > .tab-stack > .tab-content[pinned][titlechanged]:not([selected="true"]) {
  background-image: url(chrome://browser/skin/tabbrowser/indicator-tab-attention.svg);
  background-position: center bottom calc(-4px + var(--tabs-navbar-shadow-size));
  background-repeat: no-repeat;
}

@supports -moz-bool-pref("browser.proton.tabs.enabled") {
.tabbrowser-tab:is([image], [pinned]) > .tab-stack > .tab-content[attention]:not([selected="true"]),
.tabbrowser-tab > .tab-stack > .tab-content[pinned][titlechanged]:not([selected="true"]) {
  /* Only show the top half of the 12px tall indicator-tab-attention.svg. */
  background-position: center bottom -6px;
}

#tabbrowser-tabs:not([positionpinnedtabs]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab[pinned] + .tabbrowser-tab:not([pinned]) {
  margin-inline-start: 12px !important; /* .tabbrowser-tab sets margin: 0 !important; */
}
} /*** END proton ***/

.tabbrowser-tab[image] > .tab-stack > .tab-content[attention]:not([pinned], [selected="true"]) {
  background-position-x: left 11px;
}

.tabbrowser-tab[image] > .tab-stack > .tab-content[attention]:not([pinned], [selected="true"]):-moz-locale-dir(rtl) {
  background-position-x: right 11px;
}

.tab-label[attention]:not([selected="true"]) {
  font-weight: bold;
}

/* Tab drag and drop */

.tab-drop-indicator {
  width: 12px;
  margin-inline-start: -12px;
  background: url(chrome://browser/skin/tabbrowser/tab-drag-indicator.svg) no-repeat center;
  position: relative;
  /* The z-index needs to be big enough to trump other positioned UI pieces
     that we want to overlay. The selected tab uses 2. */
  z-index: 3;
}

/* Drag space */

.titlebar-spacer[type="pre-tabs"],
.titlebar-spacer[type="post-tabs"] {
  width: 40px;
}

@media (max-width: 500px) {
  .titlebar-spacer[type="post-tabs"] {
    display: none;
  }
}

/* Tab separators */

@supports not -moz-bool-pref("browser.proton.tabs.enabled") {
.titlebar-spacer[type="pre-tabs"] {
  border-inline-end: 1px solid var(--lwt-background-tab-separator-color, currentColor);
  opacity: 0.2;
}

.tabbrowser-tab::after,
.tabbrowser-tab::before {
  border-left: 1px solid var(--lwt-background-tab-separator-color, currentColor);
  margin-block: 5px 4px;
  opacity: 0.3;
}

/* Move the ::before pseudo-element on tabs 1px to the left
 * to avoid resizing the tab when the pseudo-element is removed again
 * (this currently happens when a tab is dragged and dropped).
 *
 * Note that this doesn't perfectly solve the issue (dragged tabs
 * may still resize very slightly) on some DPI settings with uneven
 * scaling factors on Windows, because of bug 477157.
 */
.tabbrowser-tab::before {
  margin-inline-start: -1px;
}

%ifdef MENUBAR_CAN_AUTOHIDE
:root[tabsintitlebar]:not([extradragspace]) #toolbar-menubar[autohide=true] + #TabsToolbar .tabbrowser-tab::after,
%else
:root[tabsintitlebar]:not([extradragspace]) .tabbrowser-tab::after,
%endif
/* Show full height tab separators on hover and multiselection. */
.tabbrowser-tab:hover::after,
#tabbrowser-tabs:not([movingtab]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab[beforehovered]::after,
.tabbrowser-tab[multiselected]::after,
#tabbrowser-tabs:not([movingtab]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab[before-multiselected]::after {
  margin-top: var(--tabs-top-border-width);
  margin-bottom: 0;
}

/* Show full height tab separators on selected tabs. */
#tabbrowser-tabs:not([movingtab]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab[beforeselected-visible]::after,
#tabbrowser-tabs[movingtab] > #tabbrowser-arrowscrollbox > .tabbrowser-tab[visuallyselected]::before,
.tabbrowser-tab[visuallyselected]::after {
  border-color: var(--tabs-border-color);
  margin-top: 0;
  margin-bottom: var(--tabs-navbar-shadow-size);
  opacity: 1;
}

.tabbrowser-tab::after,
/* Also show separators beside the selected tab when dragging it. */
#tabbrowser-tabs[movingtab] > #tabbrowser-arrowscrollbox > .tabbrowser-tab[visuallyselected]::before {
  content: "";
  display: block;
}
} /*** END !proton ***/

/* Tab bar scroll arrows */

#tabbrowser-arrowscrollbox::part(scrollbutton-up),
#tabbrowser-arrowscrollbox::part(scrollbutton-down) {
  fill: var(--lwt-toolbarbutton-icon-fill, currentColor);
  fill-opacity: var(--toolbarbutton-icon-fill-opacity);
}

/* New tab button */

#tabs-newtab-button,
#TabsToolbar #new-tab-button {
  list-style-image: url(chrome://browser/skin/add.svg);
}

/* All tabs button and menupopup */

#alltabs-button {
  list-style-image: url(chrome://global/skin/icons/arrow-dropdown-16.svg);
}

#tabbrowser-tabs[hiddensoundplaying] ~ #alltabs-button > .toolbarbutton-badge-stack > .toolbarbutton-badge {
  background: transparent url(chrome://browser/skin/tabbrowser/badge-audio-playing.svg);
  box-shadow: none;
  /* Match the color of the button, rather than label default. */
  color: inherit;
  display: block;
  -moz-context-properties: fill, fill-opacity;
  fill: currentColor;
  fill-opacity: var(--toolbarbutton-icon-fill-opacity);
  /* "!important" is necessary to override the rule in toolbarbutton.css */
  margin: -7px 0 0 !important;
  margin-inline-end: -4px !important;
  min-width: 12px;
  min-height: 12px;
}

#allTabsMenu-allTabsView {
  --blue-40: #45a1ff;
  max-width: 42em;
}

/* The list of tabs is in its own panel-subview-body which will scroll. We don't
   want any padding above/below the scrollbars, so remove the padding/margin
   from the separator and outer panel-subview-body. */
#allTabsMenu-allTabsView > .panel-subview-body {
  padding-bottom: 0;
}

#allTabsMenu-tabsSeparator {
  margin-bottom: 0;
}

.all-tabs-item > .all-tabs-secondary-button {
  padding: 0;
  padding-inline-start: 6px;
  opacity: .8;
  -moz-context-properties: fill;
  fill: currentColor;
}

.all-tabs-secondary-button:hover {
  opacity: 1;
}

.all-tabs-item:hover {
  background-color: var(--arrowpanel-dimmed)
}

.all-tabs-item:hover > .all-tabs-button,
.all-tabs-item:hover > .all-tabs-secondary-button {
  /* Since the background is set on the item, don't set it on the children. */
  background-color: transparent !important;
}

.all-tabs-item[selected] {
  font-weight: bold;
  box-shadow: inset 4px 0 var(--blue-40);
}

.all-tabs-item[selected]:-moz-locale-dir(rtl) {
  box-shadow: inset -4px 0 var(--blue-40);
}

.all-tabs-button {
  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.svg");
}

.all-tabs-secondary-button > label {
  display: none;
  margin: 0 5.5px;
}

.all-tabs-secondary-button[soundplaying] {
  list-style-image: url(chrome://browser/skin/tabbrowser/tab-audio-playing.svg);
}

.all-tabs-secondary-button[muted] {
  list-style-image: url(chrome://browser/skin/tabbrowser/tab-audio-muted.svg);
}

#allTabsMenu-undoCloseTab {
  list-style-image: url(chrome://browser/skin/undo.svg);
}

#allTabsMenu-undoCloseTab > .toolbarbutton-icon:-moz-locale-dir(rtl) {
  transform: scaleX(-1);
}

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