#pageActionButton {
    display: none !important;
  }
  .urlbar-history-dropmarker, .urlbar-history-dropmarker:hover {
      display: none !important;
  }
  
  #TabsToolbar{ 
     display: none
  }
  
  #menu_newNavigatorTab {
     accessey: none;
     acceltext: none;
     display: none;
  }
  
  #context-openlinkintab,
  menuitem[label="Email Link..."],
  menuitem[label="Import From Another Browser..."],
  #context-searchselect,
  menuitem[label="Block element..."],
  #context-bookmarklink,
  #inspect-separator,
  #context-inspect-a11y,
  #context-inspect,
  menuitem[label="Pin to Overflow Menu"],
  menuitem[label="Bookmarks Toolbar"],
  menuitem[label="Search DuckDuckGo for*"] {
     display: none;
  }