How to install:
Just click the install button in the main page, in the pop up window click install now when the button becomes active.
You also, can download the file with right click, and save as... option. after download, simply drag and drop the file over a firefox window, and click install now when the button becomes active.
Some times Greasemonkey and Ogamecompactor, did't work property in the same machine.
you must install first Ogamecompactor to solve, remove Greasemonkey if necessary, install Ogamecompactor and reinstall Greasemonkey if you need it for other scripts.