Is this the Windows security zone policy blocking downloads? If it is see the sections on resetting system internet security settings on either of these sites: * https://support.mozilla.com/en-US/kb/Unable+to+download+or+save+files#Enable_downloads_blocked_by_Security_Zone_Policy * http://kb.mozillazine.org/Unable_to_save_or_download_files#Enable_downloads_blocked_by_Security_Zone_Policy_-_Windows