myfxbook.user.css

/* ==UserStyle==
@name           myfxbook ad blocker
@namespace      github.com/mskelton
@version        1.0.2
@description    Block adds on myfxbook.com
@author         Mark Skelton
@license        ISC
@homepageURL    https://gist.github.com/mskelton/ec5d177a2b5137ec7562f7129d9919f4
==/UserStyle== */

@-moz-document domain("myfxbook.com") {
  #popupAdModal,
  #wallpaper-ad,
  #webNotificationModal,
  #webNotificationBlockModal,
  .responsive-ad-height,
  .modal-backdrop {
    display: none !important;
  }
}