I am a firefox lover because I use Firefox more than any other browser, but downloading speed normal in firefox is really slow, as if you download the same set of file through a download manager will download the same set of file with in lesser amount of time with much greater transfer rate.
But don’t worry as you can simply achieve the same download speed as you can with any download manager like Internet Download Manager with a small firefox add-on called FireDownlaod.
FireDownlaod lets you supercharge your downloads with some accelerating technology working at the back ground.