diff --git a/mozilla/editor/composer/public/nsIEditingSession.idl b/mozilla/editor/composer/public/nsIEditingSession.idl
index 71c9b10471a..8f2635f16f6 100644
--- a/mozilla/editor/composer/public/nsIEditingSession.idl
+++ b/mozilla/editor/composer/public/nsIEditingSession.idl
@@ -42,7 +42,6 @@
 #include "domstubs.idl"
 
 interface nsIEditor;
-interface nsIEditingShell;
 
 [scriptable, uuid(d39fd2b4-3978-45d2-a4be-ba448171b61b)]
 
diff --git a/mozilla/widget/public/nsINativeScrollbar.idl b/mozilla/widget/public/nsINativeScrollbar.idl
index 630e3877378..37450a2d3b7 100644
--- a/mozilla/widget/public/nsINativeScrollbar.idl
+++ b/mozilla/widget/public/nsINativeScrollbar.idl
@@ -47,12 +47,10 @@
  *
  */
 
-interface nsPresContext;
 interface nsIFrame;
 interface nsIContent;
 interface nsIScrollbarMediator;
 
-
 [uuid(b77380bc-610b-49e3-8df7-18cc946285c5)]
 interface nsINativeScrollbar : nsISupports
 {
diff --git a/mozilla/widget/public/nsIRollupListener.idl b/mozilla/widget/public/nsIRollupListener.idl
index 11b8e41361e..67a4a63cc1b 100644
--- a/mozilla/widget/public/nsIRollupListener.idl
+++ b/mozilla/widget/public/nsIRollupListener.idl
@@ -41,8 +41,6 @@
 
 #include "nsISupports.idl"
 
-interface nsIWidget;
-
 [uuid(23C2BA03-6C76-11d3-96ED-0060B0FB9956)]
 interface nsIRollupListener : nsISupports
 {