diff --git a/mozilla/layout/base/src/nsContainerFrame.cpp b/mozilla/layout/base/src/nsContainerFrame.cpp
index b29da3451b2..f89b29ce1fd 100644
--- a/mozilla/layout/base/src/nsContainerFrame.cpp
+++ b/mozilla/layout/base/src/nsContainerFrame.cpp
@@ -59,7 +59,6 @@ nsContainerFrame::Init(nsIPresContext& aPresContext, nsIFrame* aChildList)
   NS_PRECONDITION(nsnull == mFirstChild, "already initialized");
 
   mFirstChild = aChildList;
-  mChildCount = LengthOf(mFirstChild);
   return NS_OK;
 }
 
@@ -398,7 +397,6 @@ nsContainerFrame::DeleteChildsNextInFlow(nsIPresContext& aPresContext, nsIFrame*
   // Delete the next-in-flow frame and adjust its parents child count
   WillDeleteNextInFlowFrame(nextInFlow);
   nextInFlow->DeleteFrame(aPresContext);
-  parent->mChildCount--;
 
 #ifdef NS_DEBUG
   aChild->GetNextInFlow(nextInFlow);
@@ -445,10 +443,6 @@ void nsContainerFrame::PushChildren(nsIFrame* aFromChild, nsIFrame* aPrevSibling
     PRInt32   numChildren = 0;
     nsIFrame* lastChild = nsnull;
 
-#ifdef NOISY
-    ListTag(stdout);
-    printf(": pushing kids (childCount=%d)\n", mChildCount);
-#endif
     // Compute the number of children being pushed, and for each child change
     // its geometric parent. Remember the last child
     for (nsIFrame* f = aFromChild; nsnull != f; f->GetNextSibling(f)) {
@@ -473,12 +467,7 @@ void nsContainerFrame::PushChildren(nsIFrame* aFromChild, nsIFrame* aPrevSibling
     // Prepend the frames to our next-in-flow's child list
     lastChild->SetNextSibling(nextInFlow->mFirstChild);
     nextInFlow->mFirstChild = aFromChild;
-    nextInFlow->mChildCount += numChildren;
 
-#ifdef NOISY
-    ListTag(stdout);
-    printf(": push kids done (childCount=%d)\n", mChildCount);
-#endif
   } else {
     // Add the frames to our overflow list
     NS_ASSERTION(nsnull == mOverflowList, "bad overflow list");
@@ -549,7 +538,6 @@ void nsContainerFrame::AppendChildren(nsIFrame* aChild, PRBool aSetParent)
   nsIFrame* lastChild;
   for (nsIFrame* f = aChild; nsnull != f; f->GetNextSibling(f)) {
     lastChild = f;
-    mChildCount++;
 
     // Reset the geometric parent if requested
     if (aSetParent) {
@@ -642,17 +630,7 @@ NS_METHOD nsContainerFrame::VerifyTree() const
 {
 #ifdef NS_DEBUG
   NS_ASSERTION(0 == (mState & NS_FRAME_IN_REFLOW), "frame is in reflow");
-
-  // Check our child count
-  PRInt32 len = LengthOf(mFirstChild);
-  VERIFY_ASSERT(len == mChildCount, "bad child count");
-
-  nsIFrame* lastChild = LastFrame(mFirstChild);
-  if (len != 0) {
-    VERIFY_ASSERT(nsnull != lastChild, "bad last child");
-  }
   VERIFY_ASSERT(nsnull == mOverflowList, "bad overflow list");
-
 #endif
   return NS_OK;
 }
diff --git a/mozilla/layout/base/src/nsContainerFrame.h b/mozilla/layout/base/src/nsContainerFrame.h
index d2703088fa0..9b32bc28405 100644
--- a/mozilla/layout/base/src/nsContainerFrame.h
+++ b/mozilla/layout/base/src/nsContainerFrame.h
@@ -169,7 +169,6 @@ protected:
 #endif
 
   nsIFrame*   mFirstChild;
-  PRInt32     mChildCount;
   nsIFrame*   mOverflowList;
 };
 
diff --git a/mozilla/layout/forms/nsFileControlFrame.cpp b/mozilla/layout/forms/nsFileControlFrame.cpp
index 3cf840646b9..68dd250e68d 100644
--- a/mozilla/layout/forms/nsFileControlFrame.cpp
+++ b/mozilla/layout/forms/nsFileControlFrame.cpp
@@ -213,7 +213,6 @@ NS_IMETHODIMP nsFileControlFrame::Reflow(nsIPresContext&      aPresContext,
     childFrame->SetStyleContext(&aPresContext, mStyleContext);
 
     mFirstChild->SetNextSibling(childFrame);
-    mChildCount = 2;
 
     NS_RELEASE(text);
     NS_RELEASE(browse);
diff --git a/mozilla/layout/generic/nsFrameFrame.cpp b/mozilla/layout/generic/nsFrameFrame.cpp
index 2eb4a43c60f..777cdc0d937 100644
--- a/mozilla/layout/generic/nsFrameFrame.cpp
+++ b/mozilla/layout/generic/nsFrameFrame.cpp
@@ -310,7 +310,6 @@ nsHTMLFrameOuterFrame::Reflow(nsIPresContext&      aPresContext,
     mFirstChild = new nsHTMLFrameInnerFrame(mContent, this);
     // XXX temporary! use style system to get correct style!
     mFirstChild->SetStyleContext(&aPresContext, mStyleContext);
-    mChildCount = 1;
   }
  
   // nsContainerFrame::PaintBorder has some problems, kludge it here
diff --git a/mozilla/layout/generic/nsFrameSetFrame.h b/mozilla/layout/generic/nsFrameSetFrame.h
index 1725eae0045..cfacbcae681 100644
--- a/mozilla/layout/generic/nsFrameSetFrame.h
+++ b/mozilla/layout/generic/nsFrameSetFrame.h
@@ -195,6 +195,7 @@ protected:
   nsHTMLFramesetBorderFrame* mDragger;
   nsPoint          mLastDragPoint;
   PRInt32          mMinDrag;
+  PRInt32          mChildCount;
 };
 
 #if 0
diff --git a/mozilla/layout/generic/nsHTMLContainerFrame.cpp b/mozilla/layout/generic/nsHTMLContainerFrame.cpp
index 94f74c86e73..5a05d296a10 100644
--- a/mozilla/layout/generic/nsHTMLContainerFrame.cpp
+++ b/mozilla/layout/generic/nsHTMLContainerFrame.cpp
@@ -212,12 +212,6 @@ nsHTMLContainerFrame::ContentDeleted(nsIPresShell*   aShell,
       flow->mFirstChild = nextSib;
     }
 
-    // Update flows child count and last-content-offset. Note that
-    // only the last content needs updating when a deadFrame is
-    // removed from flow (because only the children that follow the
-    // deletion need renumbering).
-    flow->mChildCount--;
-
     // Break frame out of its flow and then destroy it
     nsIFrame* nextInFlow;
     deadFrame->GetNextInFlow(nextInFlow);
diff --git a/mozilla/layout/html/base/src/nsBodyFrame.h b/mozilla/layout/html/base/src/nsBodyFrame.h
index 298896e4b52..8161d36a3c7 100644
--- a/mozilla/layout/html/base/src/nsBodyFrame.h
+++ b/mozilla/layout/html/base/src/nsBodyFrame.h
@@ -113,6 +113,7 @@ protected:
 private:
   nsSpaceManager* mSpaceManager;
   nsVoidArray     mAbsoluteItems;
+  PRInt32         mChildCount;
 
   nsSize GetColumnAvailSpace(nsIPresContext* aPresContext,
                              const nsMargin& aBorderPadding,
diff --git a/mozilla/layout/html/base/src/nsHTMLContainerFrame.cpp b/mozilla/layout/html/base/src/nsHTMLContainerFrame.cpp
index 94f74c86e73..5a05d296a10 100644
--- a/mozilla/layout/html/base/src/nsHTMLContainerFrame.cpp
+++ b/mozilla/layout/html/base/src/nsHTMLContainerFrame.cpp
@@ -212,12 +212,6 @@ nsHTMLContainerFrame::ContentDeleted(nsIPresShell*   aShell,
       flow->mFirstChild = nextSib;
     }
 
-    // Update flows child count and last-content-offset. Note that
-    // only the last content needs updating when a deadFrame is
-    // removed from flow (because only the children that follow the
-    // deletion need renumbering).
-    flow->mChildCount--;
-
     // Break frame out of its flow and then destroy it
     nsIFrame* nextInFlow;
     deadFrame->GetNextInFlow(nextInFlow);
diff --git a/mozilla/layout/html/base/src/nsScrollFrame.cpp b/mozilla/layout/html/base/src/nsScrollFrame.cpp
index 2fb6f3284d7..7fd750b9a80 100644
--- a/mozilla/layout/html/base/src/nsScrollFrame.cpp
+++ b/mozilla/layout/html/base/src/nsScrollFrame.cpp
@@ -61,7 +61,6 @@ nsScrollBodyFrame::CreateFirstChild(nsIPresContext* aPresContext)
   if (aPresContext->IsPaginated()) {
     // Yes. Create the first page frame
     mFirstChild = new nsPageFrame(mContent, this);/* XXX mContent won't work here */
-    mChildCount = 1;
   } else {
     if (nsnull != mContent) {
 #if 0
@@ -81,7 +80,6 @@ nsScrollBodyFrame::CreateFirstChild(nsIPresContext* aPresContext)
       }
 #else
       nsBodyFrame::NewFrame(&mFirstChild, mContent, this);
-      mChildCount = 1;
 #endif
     }
   }
@@ -205,7 +203,6 @@ nsScrollBodyFrame::Reflow(nsIPresContext&      aPresContext,
             NS_ASSERTION(nsnull == kidNextSibling, "unexpected sibling");
   #endif
             kidFrame->SetNextSibling(continuingPage);
-            mChildCount++;
           }
   
           // Get the next page
@@ -368,7 +365,6 @@ nsScrollInnerFrame::Reflow(nsIPresContext&      aPresContext,
 
   if (nsnull == mFirstChild) {
     mFirstChild = new nsScrollBodyFrame(mContent, this);
-    mChildCount = 1;
   }
 
   // Allow the child frame to be as wide as our max width (minus a
@@ -465,7 +461,6 @@ nsScrollOuterFrame::Reflow(nsIPresContext&      aPresContext,
 
   if (nsnull == mFirstChild) {
     mFirstChild = new nsScrollInnerFrame(mContent, this);
-    mChildCount = 1;
   }
 
   const nsStyleSpacing* spacing = (const nsStyleSpacing*)
diff --git a/mozilla/layout/html/document/src/nsFrameFrame.cpp b/mozilla/layout/html/document/src/nsFrameFrame.cpp
index 2eb4a43c60f..777cdc0d937 100644
--- a/mozilla/layout/html/document/src/nsFrameFrame.cpp
+++ b/mozilla/layout/html/document/src/nsFrameFrame.cpp
@@ -310,7 +310,6 @@ nsHTMLFrameOuterFrame::Reflow(nsIPresContext&      aPresContext,
     mFirstChild = new nsHTMLFrameInnerFrame(mContent, this);
     // XXX temporary! use style system to get correct style!
     mFirstChild->SetStyleContext(&aPresContext, mStyleContext);
-    mChildCount = 1;
   }
  
   // nsContainerFrame::PaintBorder has some problems, kludge it here
diff --git a/mozilla/layout/html/document/src/nsFrameSetFrame.h b/mozilla/layout/html/document/src/nsFrameSetFrame.h
index 1725eae0045..cfacbcae681 100644
--- a/mozilla/layout/html/document/src/nsFrameSetFrame.h
+++ b/mozilla/layout/html/document/src/nsFrameSetFrame.h
@@ -195,6 +195,7 @@ protected:
   nsHTMLFramesetBorderFrame* mDragger;
   nsPoint          mLastDragPoint;
   PRInt32          mMinDrag;
+  PRInt32          mChildCount;
 };
 
 #if 0
diff --git a/mozilla/layout/html/forms/src/nsFileControlFrame.cpp b/mozilla/layout/html/forms/src/nsFileControlFrame.cpp
index 3cf840646b9..68dd250e68d 100644
--- a/mozilla/layout/html/forms/src/nsFileControlFrame.cpp
+++ b/mozilla/layout/html/forms/src/nsFileControlFrame.cpp
@@ -213,7 +213,6 @@ NS_IMETHODIMP nsFileControlFrame::Reflow(nsIPresContext&      aPresContext,
     childFrame->SetStyleContext(&aPresContext, mStyleContext);
 
     mFirstChild->SetNextSibling(childFrame);
-    mChildCount = 2;
 
     NS_RELEASE(text);
     NS_RELEASE(browse);