diff --git a/string/obsolete/nsString.h b/string/obsolete/nsString.h
index 61169ff2833..0e9430a14ca 100644
--- a/string/obsolete/nsString.h
+++ b/string/obsolete/nsString.h
@@ -895,13 +895,24 @@ class NS_COM NS_ConvertUCS2toUTF8
   {
     public:
       NS_ConvertUCS2toUTF8( const PRUnichar* aString )
-        { Init( aString, ~PRUint32(0) /* MAXINT */); }
+        {
+          Init( aString, ~PRUint32(0) /* MAXINT */);
+        }
 
       NS_ConvertUCS2toUTF8( const PRUnichar* aString, PRUint32 aLength )
-        { Init( aString, aLength ); }
+        {
+          Init( aString, aLength );
+        }
 
       NS_ConvertUCS2toUTF8( PRUnichar aChar )
-        { Init( &aChar, 1 ); }
+        {
+          Init( &aChar, 1 );
+        }
+
+      operator const char*() const
+        {
+          return GetBuffer();
+        }
 
     protected:
       void Init( const PRUnichar* aString, PRUint32 aLength );
diff --git a/string/obsolete/nsString2.h b/string/obsolete/nsString2.h
index 2c0d4a83c72..d41271e09d2 100644
--- a/string/obsolete/nsString2.h
+++ b/string/obsolete/nsString2.h
@@ -990,6 +990,11 @@ class NS_COM NS_ConvertASCIItoUCS2
 #endif
 
 #ifdef NEW_STRING_APIS
+      operator const PRUnichar*() const
+        {
+          return GetUnicode();
+        }
+
       operator nsLiteralString() const
         {
           return nsLiteralString(mUStr, mLength);
@@ -1029,13 +1034,24 @@ class NS_COM NS_ConvertUTF8toUCS2
   {
     public:
       NS_ConvertUTF8toUCS2( const char* aCString )
-        { Init( aCString, ~PRUint32(0) /* MAXINT */ ); }
+        {
+          Init( aCString, ~PRUint32(0) /* MAXINT */ );
+        }
 
       NS_ConvertUTF8toUCS2( const char* aCString, PRUint32 aLength )
-        { Init( aCString, aLength ); }
+        {
+          Init( aCString, aLength );
+        }
 
       NS_ConvertUTF8toUCS2( char aChar )
-        { Init( &aChar, 1 ); }
+        {
+          Init( &aChar, 1 );
+        }
+
+      operator const PRUnichar*() const
+        {
+          return GetUnicode();
+        }
 
     protected:
       void Init( const char* aCString, PRUint32 aLength );
diff --git a/xpcom/ds/nsString.h b/xpcom/ds/nsString.h
index 61169ff2833..0e9430a14ca 100644
--- a/xpcom/ds/nsString.h
+++ b/xpcom/ds/nsString.h
@@ -895,13 +895,24 @@ class NS_COM NS_ConvertUCS2toUTF8
   {
     public:
       NS_ConvertUCS2toUTF8( const PRUnichar* aString )
-        { Init( aString, ~PRUint32(0) /* MAXINT */); }
+        {
+          Init( aString, ~PRUint32(0) /* MAXINT */);
+        }
 
       NS_ConvertUCS2toUTF8( const PRUnichar* aString, PRUint32 aLength )
-        { Init( aString, aLength ); }
+        {
+          Init( aString, aLength );
+        }
 
       NS_ConvertUCS2toUTF8( PRUnichar aChar )
-        { Init( &aChar, 1 ); }
+        {
+          Init( &aChar, 1 );
+        }
+
+      operator const char*() const
+        {
+          return GetBuffer();
+        }
 
     protected:
       void Init( const PRUnichar* aString, PRUint32 aLength );
diff --git a/xpcom/ds/nsString2.h b/xpcom/ds/nsString2.h
index 2c0d4a83c72..d41271e09d2 100644
--- a/xpcom/ds/nsString2.h
+++ b/xpcom/ds/nsString2.h
@@ -990,6 +990,11 @@ class NS_COM NS_ConvertASCIItoUCS2
 #endif
 
 #ifdef NEW_STRING_APIS
+      operator const PRUnichar*() const
+        {
+          return GetUnicode();
+        }
+
       operator nsLiteralString() const
         {
           return nsLiteralString(mUStr, mLength);
@@ -1029,13 +1034,24 @@ class NS_COM NS_ConvertUTF8toUCS2
   {
     public:
       NS_ConvertUTF8toUCS2( const char* aCString )
-        { Init( aCString, ~PRUint32(0) /* MAXINT */ ); }
+        {
+          Init( aCString, ~PRUint32(0) /* MAXINT */ );
+        }
 
       NS_ConvertUTF8toUCS2( const char* aCString, PRUint32 aLength )
-        { Init( aCString, aLength ); }
+        {
+          Init( aCString, aLength );
+        }
 
       NS_ConvertUTF8toUCS2( char aChar )
-        { Init( &aChar, 1 ); }
+        {
+          Init( &aChar, 1 );
+        }
+
+      operator const PRUnichar*() const
+        {
+          return GetUnicode();
+        }
 
     protected:
       void Init( const char* aCString, PRUint32 aLength );
diff --git a/xpcom/string/obsolete/nsString.h b/xpcom/string/obsolete/nsString.h
index 61169ff2833..0e9430a14ca 100644
--- a/xpcom/string/obsolete/nsString.h
+++ b/xpcom/string/obsolete/nsString.h
@@ -895,13 +895,24 @@ class NS_COM NS_ConvertUCS2toUTF8
   {
     public:
       NS_ConvertUCS2toUTF8( const PRUnichar* aString )
-        { Init( aString, ~PRUint32(0) /* MAXINT */); }
+        {
+          Init( aString, ~PRUint32(0) /* MAXINT */);
+        }
 
       NS_ConvertUCS2toUTF8( const PRUnichar* aString, PRUint32 aLength )
-        { Init( aString, aLength ); }
+        {
+          Init( aString, aLength );
+        }
 
       NS_ConvertUCS2toUTF8( PRUnichar aChar )
-        { Init( &aChar, 1 ); }
+        {
+          Init( &aChar, 1 );
+        }
+
+      operator const char*() const
+        {
+          return GetBuffer();
+        }
 
     protected:
       void Init( const PRUnichar* aString, PRUint32 aLength );
diff --git a/xpcom/string/obsolete/nsString2.h b/xpcom/string/obsolete/nsString2.h
index 2c0d4a83c72..d41271e09d2 100644
--- a/xpcom/string/obsolete/nsString2.h
+++ b/xpcom/string/obsolete/nsString2.h
@@ -990,6 +990,11 @@ class NS_COM NS_ConvertASCIItoUCS2
 #endif
 
 #ifdef NEW_STRING_APIS
+      operator const PRUnichar*() const
+        {
+          return GetUnicode();
+        }
+
       operator nsLiteralString() const
         {
           return nsLiteralString(mUStr, mLength);
@@ -1029,13 +1034,24 @@ class NS_COM NS_ConvertUTF8toUCS2
   {
     public:
       NS_ConvertUTF8toUCS2( const char* aCString )
-        { Init( aCString, ~PRUint32(0) /* MAXINT */ ); }
+        {
+          Init( aCString, ~PRUint32(0) /* MAXINT */ );
+        }
 
       NS_ConvertUTF8toUCS2( const char* aCString, PRUint32 aLength )
-        { Init( aCString, aLength ); }
+        {
+          Init( aCString, aLength );
+        }
 
       NS_ConvertUTF8toUCS2( char aChar )
-        { Init( &aChar, 1 ); }
+        {
+          Init( &aChar, 1 );
+        }
+
+      operator const PRUnichar*() const
+        {
+          return GetUnicode();
+        }
 
     protected:
       void Init( const char* aCString, PRUint32 aLength );