FDM can't download multiple files in mediafire. It says that it is limited to only 1 download a time.

Take a look at this
2:39:25 AM 2/11/2010 Checking if download is malicious (see options to disable this)
2:39:27 AM 2/11/2010 OK, FDM's users did not report that this download is malicious
2:39:27 AM 2/11/2010 Starting download...
2:39:27 AM 2/11/2010 Limit of connections to this server is reached
2:39:27 AM 2/11/2010 Stopped