mobile-config-firefox/chrome/multi-row_tabs_below_content.css

/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/multi-row_tabs_below_content.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

/* Makes tabs to appear on multiple lines below the web content */
/* Tab reordering will not work and can't be made to work */

/* Make menubar enabled for getting window controls in correct place. Menubar options will be shown as overlay when mouse is at top-left corner */

/* It's recommended to move tabs new-tab-button outside tabs toolbar */

/* Change the --multirow-n-rows to change maximum number of rows before the rows will start to scroll  */
/* Scrollbar can't be clicked but the rows can be scrolled with mouse */
/* This maximum visible rows won't work before Fx66 */
/* So this setting does nothing on Fx65 and all tab rows will be shown */

@-moz-document url(chrome://browser/content/browser.xhtml){
  
  /* Dummy variable to support versions 94-96, can be removed when 96 lands */
  :root{ --lwt-frame: var(--lwt-accent-color) }
  
  :root{
    --multirow-toolbar-height: 40px;
    --multirow-top-padding: 0px;
    --multirow-n-rows: 3;
    --multirow-tab-min-width: 100px;
    --multirow-tab-dynamic-width: 1; /* Change to 0 for fixed-width tabs using the above width. */
  }
  @media (-moz-os-version: windows-win7),(-moz-os-version: windows-win10){
    :root[sizemode="maximized"]{ --multirow-top-padding: 8px }
  }
  :root[uidensity="compact"]{--multirow-toolbar-height: 34px}
  :root{ border-top-width: 0px !important }

  #main-window > body > box,
  #navigator-toolbox{ -moz-box-ordinal-group: 2; border-bottom: 0px !important }
  
  #tab-notification-deck{ -moz-box-ordinal-group: 0 }

  #titlebar{-moz-appearance: none !important; } /* Try setting to "-moz-window-titlebar" if you face issues */

  #nav-bar{
    position: fixed !important;
    /* For some reason -webkit-box behaves internally like -moz-box, but can be used with fixed position. display: flex would work too but it breaks extension menus. */
    display: -webkit-box;
    -webkit-box-flex: 1;
    margin-left: 30px;
    width: calc(100vw - 30px);
    top: var(--multirow-top-padding);
  }
  #nav-bar-customization-target{ -webkit-box-flex: 1 }
  :root[inFullscreen] #nav-bar,
  :root[tabsintitlebar] #nav-bar{
    margin-right: 138px;
    /* width == 100vw - margins */
    width: calc(100vw - 168px);
    top: var(--multirow-top-padding);
  }

  :root[inFullscreen] #TabsToolbar > #window-controls{
    display: flex !important;
    justify-content: flex-end;
    position: fixed;
    right: 0;
    width: 138px;
    height: var(--multirow-toolbar-height);
    background:var(--toolbar-bgcolor);
  }

  /* Fix incorrect vertical alignment with megabar */
  #urlbar[breakout]{ --urlbar-toolbar-height: var(--multirow-toolbar-height) !important; }

  /* Fix customization view */
  #customization-panelWrapper > .panel-arrowbox > .panel-arrow{ margin-inline-end: initial !important; }

  #customization-container,
  :root:not([inFullscreen]) #content-deck,
  :root:not([inFullscreen]) #browser{ margin-top: calc(var(--multirow-toolbar-height) + var(--multirow-top-padding))}

  :root[inFullscreen] #TabsToolbar > #window-controls,
  :root[inFullscreen] #toolbar-menubar,
  :root[inFullscreen] #nav-bar{ top: calc(1px - (var(--multirow-toolbar-height) + var(--multirow-top-padding))) }

  :root[inFullscreen] #navigator-toolbox:hover > #titlebar > #TabsToolbar > #window-controls,
  :root[inFullscreen] #navigator-toolbox:hover > #nav-bar,
  :root[inFullscreen] #navigator-toolbox:hover > #titlebar > #toolbar-menubar{ top: 0px }

  /* Restyle nav-bar and menubar */
  #nav-bar-customization-target{ flex-grow: 1 }

  #nav-bar-overflow-button,
  #PanelUI-menu-button{ height: var(--multirow-toolbar-height); }

  #toolbar-menubar{
    height: var(--multirow-toolbar-height);
    position: fixed;
    display: flex;
    visibility: visible !important;
    top: var(--multirow-top-padding);
    width: 100vw;
    color: var(--lwt-text-color);
    background: linear-gradient(to right, var(--toolbar-bgcolor), var(--toolbar-bgcolor) 30px, transparent 30px) no-repeat;
  }
  #menubar-items + spacer{ flex-grow: 1 }

  #toolbar-menubar > #menubar-items{
    -moz-box-pack: center;
    height: 100%;
    visibility: hidden;
  }

  #toolbar-menubar:hover{ z-index: 2 }
  #toolbar-menubar:hover > #menubar-items{
    visibility: visible;
    background-image: linear-gradient( to left,transparent,var(--lwt-frame) 35px);
  }

  #toolbar-menubar > .titlebar-buttonbox-container{ background: var(--toolbar-bgcolor); }

  #toolbar-menubar > .titlebar-buttonbox-container > .titlebar-buttonbox{ height: 100% ;}

  #main-menubar:last-child{ padding-inline-end: 40px }
  #toolbar-menubar > toolbarspring {
    background: url("chrome://global/skin/icons/settings.svg") no-repeat 10px;
    height: 100%;
    display: block;
    fill: currentColor;
    -moz-context-properties: fill;
    min-width: 28px !important;
    max-width: 28px !important;
  }

  :root[tabsintitlebar] #PanelUI-button{ margin-right: 20px; }

  #tabbrowser-tabs{
    min-height: unset !important;
    padding-inline-start: 0px !important
  }

  #scrollbutton-up~spacer,
  #scrollbutton-up,
  #scrollbutton-down{ display: var(--scrollbutton-display-model,initial) }

  scrollbox[part][orient="horizontal"]{
    display: flex;
    flex-wrap: wrap;
    overflow-y: auto;
    max-height: var(--uc-scrollbox-max-height,1px);
    scrollbar-color: currentColor transparent;
    scrollbar-width: thin;
    scroll-snap-type: y mandatory;
  }

  .scrollbox-clip[orient="horizontal"],
  #tabbrowser-arrowscrollbox{
    overflow: -moz-hidden-unscrollable;
    display: block;
    --scrollbutton-display-model: none;
    --uc-scrollbox-max-height: calc((var(--tab-min-height) + 2 * var(--tab-block-margin,0px)) * var(--multirow-n-rows));
  }
  
  :root[inFullscreen] .scrollbox-clip[orient="horizontal"]:not(:hover),
  :root[inFullscreen] #tabbrowser-arrowscrollbox:not(:hover){ --uc-scrollbox-max-height: 1px; min-height: 1px !important; }

  .tabbrowser-tab{
    height: calc((var(--tab-min-height) + 2 * var(--tab-block-margin,0px))) !important;
    scroll-snap-align: start;
  }

  .tabbrowser-tab[pinned]{
    position: static !important;
    margin-inline-start: 0px !important;
  }

  .tabbrowser-tab[fadein]:not([pinned]){
    min-width: var(--multirow-tab-min-width) !important;
    flex-grow: var(--multirow-tab-dynamic-width);
    /*
    Uncomment to enable full-width tabs, also makes tab dragging a tiny bit more sensible
    Don't set to none or you'll see errors in console when closing tabs
    */
    /*max-width: 100vw !important;*/
  }

  .tabbrowser-tab > stack{ width: 100%; height: 100%; }

  /* This should fix potential flash that could occur when bottom border is hovered to show tabs in fullscreen mode */
  #tabbrowser-tabpanels{ background-color: var(--lwt-frame) !important; }

  /* remove bottom margin so it doesn't throw off row height computation */
  #tabs-newtab-button{ margin-bottom: 0 !important; }

  /* Hide some things that are unnecessary in multi-row below content mode */

  #TabsToolbar > #window-controls,
  #alltabs-button,
  :root:not([customizing]) #TabsToolbar #new-tab-button,
  #tabbrowser-arrowscrollbox > spacer,
  .tabbrowser-tab::after{ display: none !important } /* Also disables tab separators since they mysteriously break tab-row scrolling */

}