Slow down the speed in some cases :( Puntuado con 1 de 5 estrellas

After testing this addon in some computers, I have noticed that when some downloads are made at the same time, at least one of two of them are lost with 0 kbs/s over one minute or more. In high speed connections at least one download is lost, and in slow connections the number is higher. Not a good choice for me :/