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

/*! Alters the webextension Tab Suspender (memory saver)
  IMPORTANT: change the Internal UUID */

@-moz-document url-prefix("moz-extension://tab_suspender_UUID/") {

  label,
  body {
      color: var(--tone-4) !important;
  }

  input[type="number"],
  textarea {
      -moz-appearance: none !important;
      background: var(--tone-6) !important;
      color: var(--tone-4) !important;
      border: 1px solid var(--tone-5) !important;
  }

  #recovery,
  #save {
    -moz-appearance: none !important;
    height: 20px !important;
    background: var(--tone-8) !important;
    color: var(--tone-4) !important;
    border: 1px solid var(--tone-6) !important;
    border-radius: 4px !important;

  }

}