public boolean handleBooleanFirst(@NotNull CefBrowser browser, @NotNull HandlerCallable<T, Boolean> callable) {
      List<T> list = get(browser);
      if (list == null) return false;
      boolean result = false;
      for (T handler: list) {
        if (Boolean.TRUE.equals(callable.handle(handler))) {
          return true;
        }
      }

      return false;
    }
public boolean handleBooleanFirst(@NotNull CefBrowser browser, @NotNull HandlerCallable<T, Boolean> callable)