xpi/content/css/transp_top_tb_w10.css
@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
@-moz-document url(chrome://browser/content/browser.xul) {

  /* allows OS titlebar colors for Fx title/menu/tabs toolbar */
  @media (-moz-os-version: windows-win10) {
    #main-window:not([customizing]){
      background-color: transparent !important;
    }
		
	@media (-moz-windows-theme:aero) {
	  #main-window:not([customizing]) .titlebar-button,
	  #main-window:not([customizing]) .titlebar-button:not(#titlebar-close) > .toolbarbutton-icon{
		opacity: 0.01 !important;
	  }
	  #main-window:not([customizing]) .titlebar-button:hover {
		opacity: 1 !important;
	  }
	}
	
	/* allows titlebar colors for caption buttons for non OS default visual styles */
	@media not all and (-moz-windows-theme:aero) {
      #main-window:not([customizing]) .titlebar-button{
        opacity: 0.01 !important;
        background: black !important;
      }
      #main-window:not([customizing]) #titlebar-close {
        background: #e81123 !important;
      }
      #main-window:not([customizing]) .titlebar-button:not(#titlebar-close) > .toolbarbutton-icon {
        opacity: 0.01 !important;
      }
	  #main-window:not([customizing]) .titlebar-button:hover {
        opacity: 0.1 !important;
      }
      #main-window:not([customizing]) #titlebar-close:hover {
        opacity: 1 !important;
      }
	}
  }
}

