Problem with volume

[malusblade]

Hi, i have a problema with the winamp volume. When i was listening music and i enter in a website, for example youtube and the browser needs to use sound, the winamp volume is lowered auto, before i havent the problem, i dont know if it is problem of the an update of the browser or an update of winamp or i dont know what can be, before i update everything works fine but now the volume lowered auto, not in winamp, in windows. Im using firefox and windows 7. Hope i explain the problem well, i dont speak english...

Thanks.