[arch-general] Defunct processes left behind for screen and firefox

Hello all! I'm having the following issue: after opening and closing some shells within the same screen session, I'm left with a bunch of defunct bash processes, that screen doesn't seem to wait for... Is there any issue with screen? Or is there any issue in general, as Firefox plugin FireGPG seems to do the same with gpg. (Which it didn't on Debian.) Thanks, Ciprian.