/* +++++++++++++++ Tabs unten in Firefox 57+ (Quantum) - V 1.0 ++++++++++++++++ */
#nav-bar{ -moz-box-ordinal-group: 1 !important; border-top-width: 0px !important; padding-top: 10px !important;} /* Haupt-Leiste mit Adresse, Suchfeld, Icons */
#PersonalToolbar { -moz-box-ordinal-group: 2 !important;} /* Bookmarks */

  /*Mehrzeilige Lesezeichen-Symbolleiste*/
@-moz-document url("chrome://browser/content/browser.xhtml") {

     / * Mehrstufige Lesezeichen-Symbolleiste  */
     
    #PersonalToolbar {
         min-height: 20px !important;
    }
             
    #PersonalToolbar,
    #PlacesToolbarItems {
        max-height: calc(20px * 7) !important;
    }
    #personal-bookmarks,
    #PlacesToolbar,
    #PlacesToolbar > hbox {
        display: block;
    }
    #PersonalToolbar toolbarbutton {
        min-height: 20px !important;
        max-height: 20px !important;
    }
    #PlacesToolbarItems {
  display: flex;
        flex-wrap: wrap;
        overflow-x: visible;
        overflow-y: auto;        
    }
    #PlacesToolbarItems {
        -moz-window-dragging: no-drag;
    }
    #PlacesToolbar #PlacesChevron {
        display: none;
    }
 }