firefox won't download file from bbc site

hi, need a help! i'm unable to download file from the bbc learning english site : http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/163_ent...
this is error message i get : quick time's plugins isn't available and require an extension of program.

it do work in mozilla installed on the hard disk.
thanks for your help.

harys