JavaScript bookmarklet for converting HTML-formatted Firefox bookmarks into a downloadable CSV file

FF_HTMLbookmarks_toCSV.js

javascript:(function(){  
  /* escape quotes and commas in contents to be comma-separated */
  function wrapCsvContents(content) {
    if (typeof(content) === 'string') {
      if (content.replace(/ /g, '').match(/[\s,"]/)) {
        return '"' + content.replace(/"/g, '""') + '"';
      }
    }
    return content;
  }
  
  /* filter bookmarks */
  let nodeList = window.document.querySelectorAll('dt a');
  let contents = Array.from(nodeList);
  let bookmarks = contents.filter(function(a) {
    let h = a.getAttribute('href');
    if (h && !h.startsWith('place')) {
      return true;
    }
  });

  /* extract basic info from FF bookmarks - name, url, date added - and sort them by name ASC */
  let output = bookmarks.map(function(a) {
    let obj = {};
    obj.name = a.innerHTML;
    obj.url = a.getAttribute('href');
    let date = new Date(parseInt(a.getAttribute('add_date')) * 1000);
    obj.added = date.toISOString();
    return obj;
  }).sort((a, b) => a.name.localeCompare(b.name));

  /* pour the bookmark contents into CSV format */
  let csvContent = 'name,url,date added\r\n';
  output.forEach(function(obj) {
    let row = [wrapCsvContents(obj.name), wrapCsvContents(obj.url), obj.added].join(',');
    csvContent += row + '\r\n';
  });

  /* put CSV contents into a CSV file reusing the original HTML file's date */
  let file = new Blob([csvContent], {type: 'text/csv;charset=utf-8;'});
  let getFileDate = new Date(window.document.lastModified).toISOString().slice(0, 10);
  let downloadLink = window.document.createElement('a');
  downloadLink.setAttribute('href', window.URL.createObjectURL(file));
  downloadLink.setAttribute('download', 'bookmarks-' + getFileDate + '.csv');
  downloadLink.innerHTML = 'Download CSV';

  /* make resulting .csv downloadable via link in the HTML file */
  let firstElem = window.document.body.firstChild; 
  window.document.body.insertBefore(downloadLink, firstElem);
})();