I tend to remove old downloads from the download manager by pressing the 'del' key. Before the update to the new download manager, Firefox would not delete downloads when the 'del' key was pressed, *if* it was still downloading. This is no longer the case, and you can now accidentally remove downloads that are still downloading if the 'del' key is pressed.

Is there a way to prevent Firefox from removing active downloads when the 'del' key is pressed?