[H] Firefox problem

[Winterlight]

My primary browser is Opera but I also am using the latest updated 
version of Firefox. A month ago I was looking for a TV show I missed 
and ran a Google search. A torrent came up, and I clicked on it. The 
torrent never downloaded but ever since, every time I load Firefox 
the torrent at 0 bytes appears on my desktop which, for Firefox, is 
the download location. It doesn't appear in download history, or 
anywhere that I can find but there it is. How do I stop this behavior 
short of uninstalling Firefox. Thanks