FF20 new download manager clears some of my downloads or double them after the download manager stuck (when i Click a song or any file its doing nothing but a sound of error) and leave me no choice but to reboot firefox and after the reboot some new songs i downloaded clear themselves from the list not to mention after i updated ff19 to ff20 my downloads list became a MESS. a lot songs have been cleared and some very old files for some reason Returned to the list. this is very annoying because its very important to me that all songs i downloading will stay in the list!

please help me!!! its very important to me!!!!