@-moz-document url(chrome://mozapps/content/extensions/aboutaddons.html){
  #main,
  #page-header > .sticky-container > div{ margin-inline: auto !important; padding-inline-end: 240px }

  @media (max-width: 800px){
    #main,
padding: 4px !important;
       #page-header > .sticky-container > div{ padding-inline-end: 118px }
  }
}