To install greasemonkey, do the following procedure:
1. Open the Firefox browser
2. Open the following pages to install the addon greasemonkey
Will open the page as below, click the "Add to Firefox"
If you have not registered as a member, click the register button on the top right corner of the page, if already registered as a member in firefox login with your email account and password firefox
2. After pressing the "Add to Firefox", will appear the following dialog box:
Click "Install Now"
Wait until the process is complete install greasemonkey in firefox
Dialog box will appear , click button restart firefox
After fiirefox open again, then the add-on greasemonkey will be active.
The next step is to install user script google book downloader