ShadowFox/userContent-files/webextension-tweaks/multiple_tabs_handler.css

/*! Alters the webextension Multiple Tab Handler
  IMPORTANT: change the Internal UUID */

@-moz-document url-prefix("moz-extension://cd5adf97-491d-f44b-9ea2-d2417d781589/") {
  h1, p, ul, ul li {
    color: var(--primary-light-color) !important;
  }
}