The bug has also been mentioned herethis is happening for me too
ahhh... ok, I'll give that a whirl...The setting described on this page fixed the issue for me:
Note that the files don't get deleted until after Firefox exits, so you will still see them on the desktop temporarily.
Nobody ? This is really irritating meHello,
so is there a way to tell FF to save temporary files to a folder different which is not the Download folder ? When I click "Open With" I would like the files for to eg /tmp so that they do not mix with my files in ~/Download