When a user attempts to install a Firefox addon, the Firefox web browser alerts the user and asks for their permission. The purpose of this project is to help guide the user along the download process. When a user clicks a button on our homepage, we need to fade the screen to a dark shade with opacity and display an image in the top right hand corner of the screen. This will help users understand how to install a Firefox addon that we provide. Examples of this feature/effect can be found...