@NotNull
  public List<String> getVisitedUrls() {
    List<String> urls = new ArrayList<>(myState.visitedUrls.size());
    for (UrlAndUserName urlAndUserName : myState.visitedUrls) {
      urls.add(urlAndUserName.url);
    }
    return urls;
  }
@NotNull
  public List<String> getVisitedUrls()