userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

/* * For more examples see http://www.mozilla.org/unix/customizing.html */

#appmenu-button-container{
  position: fixed !important;
  margin-top: 2px;
}
#navigator-toolbox[tabsontop="true"] #TabsToolbar{
  padding-left: 80px !important;
  margin-right: 105px !important;
  padding-top: 2px !important;
}
#appmenu-button{
  padding: 3px 5px 3px 5px !important;
  height: 20px !important;
  background-color: rgba(54, 121, 166, 0.2) !important;
}