hi i have ubuntu 14.04 and i update pkg s .my last firefox is ver 28 and when update that is go to 29 ver but when i try download file from internet for example

hi i have ubuntu 14.04 and i update pkg s .my last firefox is ver 28 and when update that is go to 29 ver but when i try download file from internet for example size is 1.5 mg i show (1۵3 MB) / 153mg and start to this size ;