mobile-config-firefox/chrome/toolbars_below_content.css

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

/* Moves tabs toolbar, bookmarks toolbar and main toolbar to the bottom of the window, and makes tabs be the bottom-most toolbar */

/* By default, menubar will stay on top with two options to select it's behavior - see below */

@-moz-document url(chrome://browser/content/browser.xhtml){
  
  #titlebar{ -moz-appearance: none !important; }

  #navigator-toolbox > div{ display: contents }
  .global-notificationbox,
  #mainPopupSet,
  #browser,
  #customization-container,
  #tab-notification-deck{
    -moz-box-ordinal-group: 0
  }

  /* Remove the next row if you want tabs to be the top-most row */
  #titlebar{ -moz-box-ordinal-group: 2 } 

  #toolbar-menubar{
    position: fixed;
    display: flex;
    width: 100vw;
    top: 0px;
    -moz-window-dragging: drag;
  }
  /* Remove bottom border that won't do anything useful when at bottom of the window */
  #navigator-toolbox{ border-bottom: none !important; }

  #toolbar-menubar > spacer{ flex-grow: 1 }

  #urlbar[breakout][breakout-extend]{
    display: flex !important;
    flex-direction: column-reverse;
    bottom: 0px !important; /* Change to 3-5 px if using compact_urlbar_megabar.css depending on toolbar density */
    top: auto !important;
  }

  .urlbarView-body-inner{ border-top-style: none !important; }

  /* Yeah, removes window controls. Likely not wanted on bottom row  */
  #TabsToolbar > .titlebar-buttonbox-container{ display: none }
  #toolbar-menubar > .titlebar-buttonbox-container{ order: 1000 }

  /* Fix panels sizing */
  .panel-viewstack{ max-height: unset !important; }

  /* Fullscreen mode support */
  #navigator-toolbox[inFullscreen]{ margin-top: 0 !important }
  #navigator-toolbox[inFullscreen][style*="margin-top"]{ visibility: collapse }
  #fullscr-toggler{ bottom: 0; top: unset !important; }
  
  /* These three rules exist for compatibility with autohide_toolbox.css */
  #navigator-toolbox{ bottom: 0px; transform-origin: bottom }
  #main-window > body > box{ margin-top: 0 !important; }
  #toolbar-menubar{ z-index: 1; background-color: var(--lwt-accent-color,black); }
  
  /**************
  Menubar options - By default, menubar is overlayed on top of web-content
  ***************/

 /* Uncomment the following if you want static menubar on top of the window (make menubar enabled)
  * Use when menubar is enabled to always show it */
  
  /*
  #browser,#customization-container{ padding-top: var(--uc-menubar-spacer,28px) }
  */
  
  /* OR, if uncomment the following if you want menubar to appear below content, above tabs toolbar */
  
  /*
  #toolbar-menubar{ position: static; display: -moz-box; margin-top: 0px !important; background-color: transparent }
  */

  /* set to "reverse" (without quotes) if you want tabs above menubar with the above option */
  #titlebar{ -moz-box-direction: normal; }
}