How to download ebooks on google books using google book downloader user script

How to download ebooks on google books using google book downloader user script. Using google book downloader user script and greasemonkey is one alternative for Firefox users to download books from google book. This method is a complement of the previous ways on how to download book on google books and download the ebook in google book using firefox cache

In this post we use an add-on firefox to download books from google book, there are several stages:
1. Install greasemonkey in firefox to download ebook google book
2. Install the Google book userscript downloader in firefox

After conducting the second stage above, open the Firefox browser,  then open the site google book, select one of the existing book
In this example I use google's success story books "Kisah Sukses Google"
In the top left corner of the page will display the "Download this book"
Click the "Download this book"