--- a/accessible/src/base/nsCoreUtils.cpp
+++ b/accessible/src/base/nsCoreUtils.cpp
@@ -198,18 +198,17 @@ nsCoreUtils::GetDOMElementFor(nsIContent
   return nsnull;
 }
 
 nsINode *
 nsCoreUtils::GetDOMNodeFromDOMPoint(nsINode *aNode, PRUint32 aOffset)
 {
   if (aNode && aNode->IsElement()) {
     PRUint32 childCount = aNode->GetChildCount();
-    NS_ASSERTION(aOffset >= 0 && aOffset <= childCount,
-                 "Wrong offset of the DOM point!");
+    NS_ASSERTION(aOffset <= childCount, "Wrong offset of the DOM point!");
 
     // The offset can be after last child of container node that means DOM point
     // is placed immediately after the last child. In this case use the DOM node
     // from the given DOM point is used as result node.
     if (aOffset != childCount)
       return aNode->GetChildAt(aOffset);
   }
 

--- a/accessible/src/generic/ARIAGridAccessible.cpp
+++ b/accessible/src/generic/ARIAGridAccessible.cpp
@@ -260,17 +260,17 @@ ARIAGridAccessible::SelectedCells(nsTArr
         aCells->AppendElement(cell);
     }
   }
 }
 
 void
 ARIAGridAccessible::SelectedCellIndices(nsTArray<PRUint32>* aCells)
 {
-  PRUint32 rowCount = RowCount(), colCount = ColCount();
+  PRUint32 colCount = ColCount();
 
   AccIterator rowIter(this, filters::GetRow);
   Accessible* row = nsnull;
   for (PRUint32 rowIdx = 0; (row = rowIter.Next()); rowIdx++) {
     if (nsAccUtils::IsARIASelected(row)) {
       for (PRUint32 colIdx = 0; colIdx < colCount; colIdx++)
         aCells->AppendElement(rowIdx * colCount + colIdx);
 

--- a/accessible/src/generic/HyperTextAccessible.cpp
+++ b/accessible/src/generic/HyperTextAccessible.cpp
@@ -1803,18 +1803,16 @@ HyperTextAccessible::SetSelectionBounds(
   Selection* domSel =
     frameSelection->GetSelection(nsISelectionController::SELECTION_NORMAL);
   NS_ENSURE_STATE(domSel);
 
   PRUint32 rangeCount = domSel->GetRangeCount();
   if (rangeCount < static_cast<PRUint32>(aSelectionNum))
     return NS_ERROR_INVALID_ARG;
 
-  // Caret is a collapsed selection
-  bool isOnlyCaret = (aStartOffset == aEndOffset);
   nsRefPtr<nsRange> range;
   if (aSelectionNum == rangeCount)
     range = new nsRange();
   else
     range = domSel->GetRangeAt(aSelectionNum);
 
   nsresult rv = HypertextOffsetsToDOMRange(aStartOffset, aEndOffset, range);
   NS_ENSURE_SUCCESS(rv, rv);

--- a/accessible/src/html/HTMLTableAccessible.cpp
+++ b/accessible/src/html/HTMLTableAccessible.cpp
@@ -31,16 +31,17 @@
 #include "nsIPresShell.h"
 #include "nsITableLayout.h"
 #include "nsITableCellLayout.h"
 #include "nsFrameSelection.h"
 #include "nsLayoutErrors.h"
 #include "nsArrayUtils.h"
 #include "nsComponentManagerUtils.h"
 
+using namespace mozilla;
 using namespace mozilla::a11y;
 
 ////////////////////////////////////////////////////////////////////////////////
 // HTMLTableCellAccessible
 ////////////////////////////////////////////////////////////////////////////////
 
 HTMLTableCellAccessible::
   HTMLTableCellAccessible(nsIContent* aContent, DocAccessible* aDoc) :
@@ -761,40 +762,42 @@ HTMLTableAccessible::ColExtentAt(PRUint3
   if (!tableLayout)
     return 0;
 
   nsCOMPtr<nsIDOMElement> domElement;
   PRInt32 startRowIndex, startColIndex, rowSpan, colSpan, actualRowSpan;
   bool isSelected;
   PRInt32 columnExtent = 0;
 
-  tableLayout->
+  DebugOnly<nsresult> rv = tableLayout->
     GetCellDataAt(aRowIdx, aColIdx, *getter_AddRefs(domElement),
                   startRowIndex, startColIndex, rowSpan, colSpan,
                   actualRowSpan, columnExtent, isSelected);
+  NS_ASSERTION(NS_SUCCEEDED(rv), "Could not get cell data");
 
   return columnExtent;
 }
 
 PRUint32
 HTMLTableAccessible::RowExtentAt(PRUint32 aRowIdx, PRUint32 aColIdx)
 {
   nsITableLayout* tableLayout = GetTableLayout();
   if (!tableLayout)
     return 0;
 
   nsCOMPtr<nsIDOMElement> domElement;
   PRInt32 startRowIndex, startColIndex, rowSpan, colSpan, actualColSpan;
   bool isSelected;
   PRInt32 rowExtent = 0;
 
-  tableLayout->
+  DebugOnly<nsresult> rv = tableLayout->
     GetCellDataAt(aRowIdx, aColIdx, *getter_AddRefs(domElement),
                   startRowIndex, startColIndex, rowSpan, colSpan,
                   rowExtent, actualColSpan, isSelected);
+  NS_ASSERTION(NS_SUCCEEDED(rv), "Could not get cell data");
 
   return rowExtent;
 }
 
 bool
 HTMLTableAccessible::IsColSelected(PRUint32 aColIdx)
 {
   bool isSelected = false;

--- a/accessible/src/xpcom/nsAccessibleRelation.h
+++ b/accessible/src/xpcom/nsAccessibleRelation.h
@@ -5,26 +5,27 @@
 
 #ifndef _nsAccessibleRelation_H_
 #define _nsAccessibleRelation_H_
 
 #include "nsIAccessibleRelation.h"
 
 #include "nsCOMPtr.h"
 #include "nsIMutableArray.h"
+#include "mozilla/Attributes.h"
 
 namespace mozilla {
 namespace a11y {
 
 class Relation;
 
 /**
  * Class represents an accessible relation.
  */
-class nsAccessibleRelation : public nsIAccessibleRelation
+class nsAccessibleRelation MOZ_FINAL : public nsIAccessibleRelation
 {
 public:
   nsAccessibleRelation(PRUint32 aType, Relation* aRel);
 
   NS_DECL_ISUPPORTS
   NS_DECL_NSIACCESSIBLERELATION
 
 private: