How To Auto Shut Down When Donwload Using Firefox

After working for hours to find the correct matter to download, surely one does get exhausted and does need some rest. But after all this if you have to wait for the download to finish, frustration is an obvious outcome.
For all you guys who work on firefox most of the time, there is a Add-on provided by firefox which allows you to turn off your computer once the list of download items finishes. It adds an icon to the status bar and the download manager, which enables you to automatically shut your computer down once the download has finished. To download this add-on click

here