dakni

/* 
After purchasing a humble book bundle, go to your download page for that bundle. 
Open a console window (Ctrl-Shift-K) for the page and paste in the below javascript
*/ 
var pattern = /(MOBI|EPUB|PDF|PDF \(HQ\))$/i;
var nodes = document.getElementsByTagName('a');
for (i in nodes) {
    var a = nodes[i];
    if (a && a.text && pattern.test(a.text.trim())) {
        download(a.attributes['data-web'].value, i);