diff --git a/mozilla/string/obsolete/nsString2.cpp b/mozilla/string/obsolete/nsString2.cpp
index a7cbdc27f54..a0d394fe3f3 100644
--- a/mozilla/string/obsolete/nsString2.cpp
+++ b/mozilla/string/obsolete/nsString2.cpp
@@ -180,6 +180,21 @@ PRUnichar* nsString::GetWritableFragment( nsWritableFragment<PRUnichar>& aFragme
   }
 }
 
+
+void
+nsString::do_AppendFromElement( PRUnichar inChar )
+  {
+    PRUnichar buf[2] = { 0, 0 };
+    buf[0] = inChar;
+    
+    nsStr temp;
+    nsStr::Initialize(temp, eTwoByte);
+    temp.mUStr = buf;
+    temp.mLength = 1;
+    StrAppend(*this, temp, 0, 1);
+  }
+
+
 nsString::nsString( const nsAReadableString& aReadable ) {
   Initialize(*this,eTwoByte);
   Assign(aReadable);
diff --git a/mozilla/string/obsolete/nsString2.h b/mozilla/string/obsolete/nsString2.h
index d41271e09d2..cec472b57ec 100644
--- a/mozilla/string/obsolete/nsString2.h
+++ b/mozilla/string/obsolete/nsString2.h
@@ -505,6 +505,8 @@ public:
   void AppendWithConversion(const char*, PRInt32=-1);
   void AppendWithConversion(char);
 
+  virtual void do_AppendFromElement( PRUnichar );
+
 #ifndef NEW_STRING_APIS
   /*
    *  Appends n characters from given string to this,
diff --git a/mozilla/xpcom/ds/nsString2.cpp b/mozilla/xpcom/ds/nsString2.cpp
index a7cbdc27f54..a0d394fe3f3 100644
--- a/mozilla/xpcom/ds/nsString2.cpp
+++ b/mozilla/xpcom/ds/nsString2.cpp
@@ -180,6 +180,21 @@ PRUnichar* nsString::GetWritableFragment( nsWritableFragment<PRUnichar>& aFragme
   }
 }
 
+
+void
+nsString::do_AppendFromElement( PRUnichar inChar )
+  {
+    PRUnichar buf[2] = { 0, 0 };
+    buf[0] = inChar;
+    
+    nsStr temp;
+    nsStr::Initialize(temp, eTwoByte);
+    temp.mUStr = buf;
+    temp.mLength = 1;
+    StrAppend(*this, temp, 0, 1);
+  }
+
+
 nsString::nsString( const nsAReadableString& aReadable ) {
   Initialize(*this,eTwoByte);
   Assign(aReadable);
diff --git a/mozilla/xpcom/ds/nsString2.h b/mozilla/xpcom/ds/nsString2.h
index d41271e09d2..cec472b57ec 100644
--- a/mozilla/xpcom/ds/nsString2.h
+++ b/mozilla/xpcom/ds/nsString2.h
@@ -505,6 +505,8 @@ public:
   void AppendWithConversion(const char*, PRInt32=-1);
   void AppendWithConversion(char);
 
+  virtual void do_AppendFromElement( PRUnichar );
+
 #ifndef NEW_STRING_APIS
   /*
    *  Appends n characters from given string to this,
diff --git a/mozilla/xpcom/string/obsolete/nsString2.cpp b/mozilla/xpcom/string/obsolete/nsString2.cpp
index a7cbdc27f54..a0d394fe3f3 100644
--- a/mozilla/xpcom/string/obsolete/nsString2.cpp
+++ b/mozilla/xpcom/string/obsolete/nsString2.cpp
@@ -180,6 +180,21 @@ PRUnichar* nsString::GetWritableFragment( nsWritableFragment<PRUnichar>& aFragme
   }
 }
 
+
+void
+nsString::do_AppendFromElement( PRUnichar inChar )
+  {
+    PRUnichar buf[2] = { 0, 0 };
+    buf[0] = inChar;
+    
+    nsStr temp;
+    nsStr::Initialize(temp, eTwoByte);
+    temp.mUStr = buf;
+    temp.mLength = 1;
+    StrAppend(*this, temp, 0, 1);
+  }
+
+
 nsString::nsString( const nsAReadableString& aReadable ) {
   Initialize(*this,eTwoByte);
   Assign(aReadable);
diff --git a/mozilla/xpcom/string/obsolete/nsString2.h b/mozilla/xpcom/string/obsolete/nsString2.h
index d41271e09d2..cec472b57ec 100644
--- a/mozilla/xpcom/string/obsolete/nsString2.h
+++ b/mozilla/xpcom/string/obsolete/nsString2.h
@@ -505,6 +505,8 @@ public:
   void AppendWithConversion(const char*, PRInt32=-1);
   void AppendWithConversion(char);
 
+  virtual void do_AppendFromElement( PRUnichar );
+
 #ifndef NEW_STRING_APIS
   /*
    *  Appends n characters from given string to this,