mobile-config-firefox/chrome/navbar_below_content.css

/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/navbar_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 the main toolbar (#nav-bar) to the bottom of the window */

@-moz-document url(chrome://browser/content/browser.xhtml){

  :root:not([inFullscreen]){
    --uc-bottom-toolbar-height: calc(39px + var(--toolbarbutton-outer-padding) )
  }

  :root[uidensity="compact"]:not([inFullscreen]){
    --uc-bottom-toolbar-height: calc(32px + var(--toolbarbutton-outer-padding) )
  }

  #browser,
  #customization-container{ margin-bottom: var(--uc-bottom-toolbar-height,0px) }

  #nav-bar{
    position: fixed !important;
    bottom: 0px;
    /* 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;
    width: 100%;
    z-index: 1;
  }

  #nav-bar-customization-target{ -webkit-box-flex: 1; }

  #urlbar[breakout][breakout-extend]{
    display: flex !important;
    flex-direction: column-reverse;
    bottom: -2px !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; }

}