''Why can't I open my downloads?'' The shortcut "Ctrl+J" takes you to the Downloads Manager, it is basically a journal of downloads. If the file is deleted afterwards it knows nothing about that. So if you download to a temporary files directly you could have many things clearing that. Likewise if you have Firefox set up to clear your history and that includes downloads you would lose them. * http://img232.imageshack.us/img232/4928/clearcachew.png If you are in Private session ("Ctrl+Shift+P") or permanent Private session with Tools > Options > Privacy > "Never Remember History" you would lose them. ---- Right click on one of the files in the downloads to see where it was downloaded to. Also see about:config settings mentioned in the following along with other problems. http://kb.mozillazine.org/Unable_to_save_or_download_files