Q: I recently purchased a used third-generation iPod nano. I do not have a manual for it. I’m using Windows 7 on my PC with iTunes 11 and Firefox 19. When I try to eject the nano, I get a message that it can’t be ejected because a file is in use. I have found that if I close Firefox it will then let me eject. Do you know if this is a nano, iTunes, Firefox, or Windows problem? It can be annoying if I have something up on Firefox that I…