diff --git a/layout/generic/nsBlockFrame.cpp b/layout/generic/nsBlockFrame.cpp
index 9ca88b983b5..7c9964c0934 100644
--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@@ -3039,7 +3039,7 @@ nsBlockFrame::ReflowBlockFrame(nsBlockReflowState& aState,
     // construct the html reflow state for the block. ReflowBlock 
     // will initialize it
     nsHTMLReflowState blockHtmlRS(aState.mPresContext, aState.mReflowState, frame, 
-                                  nsSize(availSpace.width, availSpace.height));
+                                  availSpace.Size());
     blockHtmlRS.mFlags.mHasClearance = aLine->HasClearance();
     
     nsFloatManager::SavedState floatManagerState;
@@ -5730,7 +5730,7 @@ nsBlockFrame::ComputeFloatWidth(nsBlockReflowState& aState,
                                                 aFloat);
 
   nsHTMLReflowState floatRS(aState.mPresContext, aState.mReflowState, aFloat, 
-                            nsSize(availSpace.width, availSpace.height));
+                            availSpace.Size());
   return floatRS.ComputedWidth() + floatRS.mComputedBorderPadding.LeftRight() +
     floatRS.mComputedMargin.LeftRight();
 }
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index 199678c1d7a..4b0c016d679 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -7715,7 +7715,7 @@ nsFrame::DoLayout(nsBoxLayoutState& aState)
 
       // ensure our size is what we think is should be. Someone could have
       // reset the frame to be smaller or something dumb like that. 
-      SetSize(nsSize(ourRect.width, ourRect.height));
+      SetSize(ourRect.Size());
     }
   }
 
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index 06241eda886..494424d0b51 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -830,8 +830,8 @@ public:
    * position.
    */
   nsRect GetRect() const { return mRect; }
-  nsPoint GetPosition() const { return nsPoint(mRect.x, mRect.y); }
-  nsSize GetSize() const { return nsSize(mRect.width, mRect.height); }
+  nsPoint GetPosition() const { return mRect.TopLeft(); }
+  nsSize GetSize() const { return mRect.Size(); }
 
   /**
    * When we change the size of the frame's border-box rect, we may need to
diff --git a/layout/tables/nsTableRowFrame.cpp b/layout/tables/nsTableRowFrame.cpp
index c1e6dba25c7..f95da67a702 100644
--- a/layout/tables/nsTableRowFrame.cpp
+++ b/layout/tables/nsTableRowFrame.cpp
@@ -1260,8 +1260,7 @@ nsTableRowFrame::CollapseRowIfNecessary(nscoord aRowOffset,
         // collapse the cell!
         nsRect cellBounds(0, 0, cRect.width, cRect.height);
         nsOverflowAreas cellOverflow(cellBounds, cellBounds);
-        cellFrame->FinishAndStoreOverflow(cellOverflow,
-                                          nsSize(cRect.width, cRect.height));
+        cellFrame->FinishAndStoreOverflow(cellOverflow, cRect.Size());
         nsTableFrame::RePositionViews(cellFrame);
         ConsiderChildOverflow(overflow, cellFrame);
                 
@@ -1276,8 +1275,8 @@ nsTableRowFrame::CollapseRowIfNecessary(nscoord aRowOffset,
   }
 
   SetRect(rowRect);
-  overflow.UnionAllWith(nsRect(0,0,rowRect.width, rowRect.height));
-  FinishAndStoreOverflow(overflow, nsSize(rowRect.width, rowRect.height));
+  overflow.UnionAllWith(nsRect(0, 0, rowRect.width, rowRect.height));
+  FinishAndStoreOverflow(overflow, rowRect.Size());
 
   nsTableFrame::RePositionViews(this);
   nsTableFrame::InvalidateTableFrame(this, oldRect, oldVisualOverflow, false);
diff --git a/layout/tables/nsTableRowGroupFrame.cpp b/layout/tables/nsTableRowGroupFrame.cpp
index c984782e34a..11156858489 100644
--- a/layout/tables/nsTableRowGroupFrame.cpp
+++ b/layout/tables/nsTableRowGroupFrame.cpp
@@ -837,7 +837,7 @@ nsTableRowGroupFrame::CollapseRowGroupIfNecessary(nscoord aYTotalOffset,
   
   SetRect(groupRect);
   overflow.UnionAllWith(nsRect(0, 0, groupRect.width, groupRect.height));
-  FinishAndStoreOverflow(overflow, nsSize(groupRect.width, groupRect.height));
+  FinishAndStoreOverflow(overflow, groupRect.Size());
   nsTableFrame::RePositionViews(this);
   nsTableFrame::InvalidateTableFrame(this, oldGroupRect, oldGroupVisualOverflow,
                                      false);
diff --git a/layout/xul/base/src/nsBox.cpp b/layout/xul/base/src/nsBox.cpp
index 84e03f8f54f..ada6abe677d 100644
--- a/layout/xul/base/src/nsBox.cpp
+++ b/layout/xul/base/src/nsBox.cpp
@@ -245,7 +245,7 @@ nsBox::SetBounds(nsBoxLayoutState& aState, const nsRect& aRect, bool aRemoveOver
     flags |= stateFlags;
 
     if ((flags & NS_FRAME_NO_MOVE_FRAME) == NS_FRAME_NO_MOVE_FRAME)
-      SetSize(nsSize(aRect.width, aRect.height));
+      SetSize(aRect.Size());
     else
       SetRect(aRect);
 
diff --git a/layout/xul/base/src/nsImageBoxFrame.cpp b/layout/xul/base/src/nsImageBoxFrame.cpp
index e0147855e73..ac4e82f3306 100644
--- a/layout/xul/base/src/nsImageBoxFrame.cpp
+++ b/layout/xul/base/src/nsImageBoxFrame.cpp
@@ -496,7 +496,7 @@ nsImageBoxFrame::GetPrefSize(nsBoxLayoutState& aState)
      GetImageSize();
 
   if (!mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0))
-    size = nsSize(mSubRect.width, mSubRect.height);
+    size = mSubRect.Size();
   else
     size = mImageSize;