--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -4173,16 +4173,17 @@ nsFrame::List(FILE* out, PRInt32 aIndent
   }
   fprintf(out, " [content=%p]", static_cast<void*>(mContent));
   nsFrame* f = const_cast<nsFrame*>(this);
   if (f->HasOverflowRect()) {
     nsRect overflowArea = f->GetOverflowRect();
     fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea.x, overflowArea.y,
             overflowArea.width, overflowArea.height);
   }
+  fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
   fputs("\n", out);
   return NS_OK;
 }
 
 NS_IMETHODIMP
 nsFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("Frame"), aResult);

--- a/layout/generic/nsImageFrame.cpp
+++ b/layout/generic/nsImageFrame.cpp
@@ -1584,22 +1584,22 @@ nsImageFrame::List(FILE* out, PRInt32 aI
   IndentBy(out, aIndent);
   ListTag(out);
 #ifdef DEBUG_waterson
   fprintf(out, " [parent=%p]", mParent);
 #endif
   if (HasView()) {
     fprintf(out, " [view=%p]", (void*)GetView());
   }
-  fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, 
-mRect.height);
+  fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
   if (0 != mState) {
     fprintf(out, " [state=%016llx]", mState);
   }
   fprintf(out, " [content=%p]", (void*)mContent);
+  fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
 
   // output the img src url
   nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
   if (imageLoader) {
     nsCOMPtr<imgIRequest> currentRequest;
     imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
                             getter_AddRefs(currentRequest));
     if (currentRequest) {

--- a/layout/generic/nsPlaceholderFrame.cpp
+++ b/layout/generic/nsPlaceholderFrame.cpp
@@ -272,16 +272,19 @@ nsPlaceholderFrame::List(FILE* out, PRIn
     fprintf(out, " prev-in-flow=%p", static_cast<void*>(prevInFlow));
   }
   if (nsnull != nextInFlow) {
     fprintf(out, " next-in-flow=%p", static_cast<void*>(nextInFlow));
   }
   if (nsnull != mContent) {
     fprintf(out, " [content=%p]", static_cast<void*>(mContent));
   }
+  if (nsnull != mStyleContext) {
+    fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
+  }
   if (mOutOfFlowFrame) {
     fprintf(out, " outOfFlowFrame=");
     nsFrame::ListTag(out, mOutOfFlowFrame);
   }
   fputs("\n", out);
   return NS_OK;
 }
 #endif