Bookmarklet dropbox folder files size

gistfile1.js

javascript:(function() {  var kb = Object.values(BrowseFile._file_index).reduce(function(kb, file) {    return kb + file.bytes/1000;  }, 0);  var units = ['kb', 'mb', 'gb', 'tb'], unit = units.shift(), size = kb;  for (var i=0; i<3; i++) {    if (size < 1000) {      break;    }    size /= 1000;    unit = units.shift();  }  alert('Folder size: ' + (Math.round(size*1000)/1000) + ' ' + unit);})();