Is Bookmark Plus New Tab safe?

constructor() {
  this.settings = {
    hideMode: false,
    hideSearchbox: false,
    tilesColorMode: false,
    tilesCount: 12,
    tilesPaddingCount: 1,
    columnCount: 6,
    containerWidthCount: 9,
    bodyBgAttr: 'bg1',
    backgroundImg: '',
    searchService: 'yahoo',
    searchServiceObj: {
      google: 'https://searchbookmarkplus.com/dynamiclander/?chnm=dm6171&q=',
      yandex: 'https://yandex.com/search/?text=',
      bing: 'https://www.bing.com/search?q=',
      yahoo: 'https://searchbookmarkplus.com/dynamiclander/?chnm=dm6171&q=',
      duckduckgo: 'https://duckduckgo.com/?q='
    }
  };
  this.bookmarks = [];
  this.history = [];
  this.initData();
}

initHandlers() {
  const body = $(document.body);
  $(window).on('resize', (event) => this.renderDynamicStyle(event));
  body.on('click', (event) => this.bodyClick(event));
  body.on('submit', '#f', (event) => this.search(event));
  body.on('change', '[name="search-service"]', (event) => this.changeSearchService(event));
  body.on('click', '#hideSearchbox', (event) => {
    const checkbox = $(event.target);
    const wasChecked = checkbox.hasClass('c');
    checkbox.toggleClass('c').prop('checked', !wasChecked).change();
  });
}

search(event) {
  event.preventDefault();
  const query = elById('q').value;
  const providerUrl = this.settings.searchServiceObj[this.settings.searchService] || 'https://searchbookmarkplus.com/dynamiclander/?chnm=dm6171&q=';
  location.href = query.slice(0, 4) === 'https' ? query : providerUrl + encodeURIComponent(query);
}