At the risk of possible taunting and ridecule on your part , you've installed the leechget mozilla plugin right?

You know the one you have to install to get it to download from mozilla, the one it tells you to download on the leechget website.

I mean that would be almost as silly as not selecting leechget from the list in the flashgot options, given that you need to obviously install the plugin to get it to appear on the list.

but of course, you'll have done all that