PR_AtomicDecrement(&g_InstanceCount); gInstance = NULL;
NS_IF_RELEASE(mFileSpec); NS_IF_RELEASE(mLIFileSpec); ShutDown(); PR_AtomicDecrement(&g_InstanceCount); gInstance = NULL;
nsPref::~nsPref()//----------------------------------------------------------------------------------------{  PR_AtomicDecrement(&g_InstanceCount);  gInstance = NULL;}