if (nsnull != mFirstLetterRule) { mFirstLetterRule->mSheet = nsnull; NS_RELEASE(mFirstLetterRule); }
HTMLCSSStyleSheetImpl::~HTMLCSSStyleSheetImpl(){  NS_RELEASE(mURL);  if (nsnull != mFirstLineRule) {    mFirstLineRule->mSheet = nsnull;    NS_RELEASE(mFirstLineRule);  }}