IE and Firefox downloaders

ok recently on two cations when i tryed to download something with firefox both the firefox download manager and the IE download manager pop up and wants to save the file. whats causeing this? so far it has only happed on xfire and filefront. on other sites things download normaly.

I would guess you have some malware

turns out it has something to do with the paypal plug in, maybe it uses ie for something.