There are 3 previous versions of this script.
// ==UserScript==
// @name Google Bookmarks Total Count
// @namespace Umakanthan Chandran(cumakt@gmail.com);
// @description Shows the Total count of bookmarks for Google Bookmarks
// @include http*://*.google.*/bookmarks/*
// ==/UserScript==
var totalCount = 0;
setTimeout(callme,5000);
function callme()
{
elements = document.getElementsByClassName("label-count");
for(var i=0;i<elements.length;i++)
{
totalCount = totalCount + parseInt(elements[i].innerHTML,10);
}
elem = document.getElementsByClassName("all-labels")[0].getElementsByClassName("label pointer")[0];
elem.innerHTML = elem.innerHTML + "(" + totalCount + ")";
}