diff --git a/content/base/public/nsINodeInfo.h b/content/base/public/nsINodeInfo.h
index 205fe5c1185..2520899cbfc 100644
--- a/content/base/public/nsINodeInfo.h
+++ b/content/base/public/nsINodeInfo.h
@@ -72,8 +72,8 @@ class nsIPrincipal;
 
 // IID for the nsINodeInfo interface
 #define NS_INODEINFO_IID      \
-{ 0xdfb15226, 0x79ad, 0x4c7c, \
- { 0x9d, 0x73, 0x3d, 0xbc, 0x13, 0x17, 0x02, 0x74 } }
+{ 0xc5188ea1, 0x0a9c, 0x43e6, \
+ { 0x95, 0x90, 0xcc, 0x43, 0x6b, 0xe9, 0xcf, 0xa0 } }
 
 class nsINodeInfo : public nsISupports
 {
@@ -254,13 +254,30 @@ public:
     return mInner.mNamespaceID == aNamespaceID;
   }
 
-  virtual PRBool Equals(const nsAString& aName) const = 0;
-  virtual PRBool Equals(const nsAString& aName,
-                        const nsAString& aPrefix) const = 0;
-  virtual PRBool Equals(const nsAString& aName,
-                        PRInt32 aNamespaceID) const = 0;
-  virtual PRBool Equals(const nsAString& aName, const nsAString& aPrefix,
-                        PRInt32 aNamespaceID) const = 0;
+  PRBool Equals(const nsAString& aName) const
+  {
+    return mInner.mName->Equals(aName);
+  }
+
+  PRBool Equals(const nsAString& aName, const nsAString& aPrefix) const
+  {
+    return mInner.mName->Equals(aName) &&
+      (mInner.mPrefix ? mInner.mPrefix->Equals(aPrefix) : aPrefix.IsEmpty());
+  }
+
+  PRBool Equals(const nsAString& aName, PRInt32 aNamespaceID) const
+  {
+    return mInner.mNamespaceID == aNamespaceID &&
+      mInner.mName->Equals(aName);
+  }
+
+  PRBool Equals(const nsAString& aName, const nsAString& aPrefix,
+                PRInt32 aNamespaceID) const
+  {
+    return mInner.mName->Equals(aName) && mInner.mNamespaceID == aNamespaceID &&
+      (mInner.mPrefix ? mInner.mPrefix->Equals(aPrefix) : aPrefix.IsEmpty());
+  }
+
   virtual PRBool NamespaceEquals(const nsAString& aNamespaceURI) const = 0;
 
   PRBool QualifiedNameEquals(nsIAtom* aNameAtom) const
diff --git a/content/base/src/nsNodeInfo.cpp b/content/base/src/nsNodeInfo.cpp
index 1bee1a78c21..91136332290 100644
--- a/content/base/src/nsNodeInfo.cpp
+++ b/content/base/src/nsNodeInfo.cpp
@@ -208,49 +208,6 @@ nsNodeInfo::GetNamespaceURI(nsAString& aNameSpaceURI) const
 }
 
 
-PRBool
-nsNodeInfo::Equals(const nsAString& aName) const
-{
-  return mInner.mName->Equals(aName);
-}
-
-
-PRBool
-nsNodeInfo::Equals(const nsAString& aName, const nsAString& aPrefix) const
-{
-  if (!mInner.mName->Equals(aName)) {
-    return PR_FALSE;
-  }
-
-  if (!mInner.mPrefix) {
-    return aPrefix.IsEmpty();
-  }
-
-  return mInner.mPrefix->Equals(aPrefix);
-}
-
-
-PRBool
-nsNodeInfo::Equals(const nsAString& aName, PRInt32 aNamespaceID) const
-{
-  return mInner.mNamespaceID == aNamespaceID &&
-    mInner.mName->Equals(aName);
-}
-
-
-PRBool
-nsNodeInfo::Equals(const nsAString& aName, const nsAString& aPrefix,
-                   PRInt32 aNamespaceID) const
-{
-  if (!mInner.mNamespaceID == aNamespaceID ||
-      !mInner.mName->Equals(aName))
-    return PR_FALSE;
-
-  return mInner.mPrefix ? mInner.mPrefix->Equals(aPrefix) :
-    aPrefix.IsEmpty();
-}
-
-
 PRBool
 nsNodeInfo::NamespaceEquals(const nsAString& aNamespaceURI) const
 {
diff --git a/content/base/src/nsNodeInfo.h b/content/base/src/nsNodeInfo.h
index 61a40793001..cee6d8df991 100644
--- a/content/base/src/nsNodeInfo.h
+++ b/content/base/src/nsNodeInfo.h
@@ -60,12 +60,6 @@ public:
 
   // nsINodeInfo
   virtual nsresult GetNamespaceURI(nsAString& aNameSpaceURI) const;
-  virtual PRBool Equals(const nsAString& aName) const;
-  virtual PRBool Equals(const nsAString& aName,
-                        const nsAString& aPrefix) const;
-  virtual PRBool Equals(const nsAString& aName, PRInt32 aNamespaceID) const;
-  virtual PRBool Equals(const nsAString& aName, const nsAString& aPrefix,
-                        PRInt32 aNamespaceID) const;
   virtual PRBool NamespaceEquals(const nsAString& aNamespaceURI) const;
 
   // nsNodeInfo