Cambios

var abbrs = {};

$("ul#listwidget-1 li a").each(function (i) {

});

var abbrsLetters = {};

$(".ln-letters a").each(function (i) {

var letter = this.firstChild.nodeValue.toLowerCase().trim();

abbrsLetters[letter] = $("#listwidget-1 li.ln-" + letter ).length;

});