diff --git a/mozilla/layout/inspector/src/inFlasher.cpp b/mozilla/layout/inspector/src/inFlasher.cpp
index 8864caf0f13..e1469e9ec86 100644
--- a/mozilla/layout/inspector/src/inFlasher.cpp
+++ b/mozilla/layout/inspector/src/inFlasher.cpp
@@ -167,7 +167,7 @@ inFlasher::DrawElementOutline(nsIDOMElement* aElement)
   if (!window) return NS_OK;
   nsCOMPtr<nsIPresShell> presShell = inLayoutUtils::GetPresShellFor(window);
 
-  nsCOMPtr<nsIPresContext> presContext;
+  nsCOMPtr<nsPresContext> presContext;
   presShell->GetPresContext(getter_AddRefs(presContext));
 
   float p2t;
diff --git a/mozilla/layout/inspector/src/inLayoutUtils.cpp b/mozilla/layout/inspector/src/inLayoutUtils.cpp
index 2b67f393250..c88b25e59fc 100644
--- a/mozilla/layout/inspector/src/inLayoutUtils.cpp
+++ b/mozilla/layout/inspector/src/inLayoutUtils.cpp
@@ -50,7 +50,7 @@
 #include "nsIPresShell.h"
 #include "nsIViewManager.h"
 #include "nsIWidget.h"
-#include "nsIPresContext.h"
+#include "nsPresContext.h"
 #include "nsXULAtoms.h"
 #include "nsHTMLAtoms.h"
 
@@ -125,7 +125,7 @@ inLayoutUtils::GetEventStateManagerFor(nsIDOMElement *aElement)
   nsIPresShell *shell = doc->GetShellAt(0);
   NS_ASSERTION(shell, "No pres shell");
 
-  nsCOMPtr<nsIPresContext> presContext;
+  nsCOMPtr<nsPresContext> presContext;
   shell->GetPresContext(getter_AddRefs(presContext));
   NS_ASSERTION(presContext, "No pres context");
 
@@ -133,7 +133,7 @@ inLayoutUtils::GetEventStateManagerFor(nsIDOMElement *aElement)
 }
 
 nsPoint
-inLayoutUtils::GetClientOrigin(nsIPresContext* aPresContext,
+inLayoutUtils::GetClientOrigin(nsPresContext* aPresContext,
                                nsIFrame* aFrame)
 {
   nsPoint result(0,0);
@@ -171,7 +171,7 @@ inLayoutUtils::GetScreenOrigin(nsIDOMElement* aElement)
       // Flush all pending notifications so that our frames are uptodate
       doc->FlushPendingNotifications(Flush_Layout);
 
-      nsCOMPtr<nsIPresContext> presContext;
+      nsCOMPtr<nsPresContext> presContext;
       presShell->GetPresContext(getter_AddRefs(presContext));
       
       if (presContext) {
diff --git a/mozilla/layout/inspector/src/inLayoutUtils.h b/mozilla/layout/inspector/src/inLayoutUtils.h
index 76bce35ba0a..74d513dc4b4 100644
--- a/mozilla/layout/inspector/src/inLayoutUtils.h
+++ b/mozilla/layout/inspector/src/inLayoutUtils.h
@@ -69,7 +69,7 @@ public:
    * @param aPresContext the presentation context
    * @return the offset
    */
-  static nsPoint GetClientOrigin(nsIPresContext* aPresContext,
+  static nsPoint GetClientOrigin(nsPresContext* aPresContext,
                                  nsIFrame* aFrame);
   static nsRect& GetScreenOrigin(nsIDOMElement* aElement);