diff --git a/intl/uconv/idl/nsICharsetConverterManager.idl b/intl/uconv/idl/nsICharsetConverterManager.idl
index c7ff7ffb6160..3b0b0ab04b92 100644
--- a/intl/uconv/idl/nsICharsetConverterManager.idl
+++ b/intl/uconv/idl/nsICharsetConverterManager.idl
@@ -87,7 +87,7 @@ interface nsICharsetConverterManager : nsISupports
      *    notForOutgoing - not to be used for exporting files.
      *    LangGroup      - language code for charset, e.g. 'he' and 'zh-CN'.
      *    isMultibyte    - is this a multi-byte charset?
-     *    isXSSVulnerable - not to be used in untrusted web content
+     *    isInternal     - not to be used in untrusted web content.
      * 
      * @param aCharset name of the character encoding, e.g. 'iso-8859-15'.
      * @param aProp property desired for the character encoding.
diff --git a/intl/uconv/idl/nsIScriptableUConv.idl b/intl/uconv/idl/nsIScriptableUConv.idl
index 442503055f70..1eda6c875260 100644
--- a/intl/uconv/idl/nsIScriptableUConv.idl
+++ b/intl/uconv/idl/nsIScriptableUConv.idl
@@ -74,8 +74,8 @@ interface nsIScriptableUnicodeConverter : nsISupports
    * Internal use
    *
    * When this attribute is set, all charsets may be accessed.
-   * When it is not set (the default), charsets with the isXSSVulnerable flag
-   *  may not be accessed
+   * When it is not set (the default), charsets with the isInternal flag
+   *  may not be accessed.
    */
   attribute boolean isInternal;
 };
diff --git a/intl/uconv/src/charsetData.properties b/intl/uconv/src/charsetData.properties
index f91b4f021752..40ceac38a982 100644
--- a/intl/uconv/src/charsetData.properties
+++ b/intl/uconv/src/charsetData.properties
@@ -13,9 +13,9 @@
 ## charset_name.notForOutgoing = anything  -  specifies that this charset is 
 ## not to be used for exporting files ('SaveAsCharset' in composer)
 ##
-## charset_name.isXSSVulnerable = anything - specifies that this charset is
-## known to be vulnerable to XSS attacks and should not be exposed to web
-## content
+## charset_name.isInternal = anything - specifies that this charset should
+## not be exposed to web content because of the vulnerability to XSS attacks
+## or some other reasons
 ##
 ## charset_name.LangGroup = 
 ##
@@ -41,31 +41,33 @@ ibm869.notForBrowser                    = true
 ibm1125.notForBrowser                   = true
 ibm1131.notForBrowser                   = true
 
-# charset with isXSSVulnerable
+# charset with isInternal
 x-mac-arabic.notForBrowser              = true
 x-mac-farsi.notForBrowser               = true
 x-mac-hebrew.notForBrowser              = true
 x-imap4-modified-utf7.notForBrowser     = true
 utf-7.notForBrowser                     = true
+ibm864.notForBrowser                    = true
 
-x-mac-arabic.isXSSVulnerable            = true
-x-mac-farsi.isXSSVulnerable             = true
-x-mac-hebrew.isXSSVulnerable            = true
-x-imap4-modified-utf7.isXSSVulnerable   = true
-utf-7.isXSSVulnerable                   = true
-t.61-8bit.isXSSVulnerable               = true
+x-mac-arabic.isInternal                 = true
+x-mac-farsi.isInternal                  = true
+x-mac-hebrew.isInternal                 = true
+x-imap4-modified-utf7.isInternal        = true
+utf-7.isInternal                        = true
+t.61-8bit.isInternal                    = true
+ibm864.isInternal                       = true
 
-t.61-8bit.notForOutgoing             = true
-utf-7.notForOutgoing                 = true
-x-imap4-modified-utf7.notForOutgoing = true
-us-ascii.notForOutgoing                  = true
-iso-8859-6-e.notForOutgoing              = true
-iso-8859-6-i.notForOutgoing              = true
-ibm864i.notForOutgoing                   = true
-ibm869.notForOutgoing                    = true
-ibm1125.notForOutgoing                   = true
-ibm1131.notForOutgoing                   = true
-iso-8859-8-e.notForOutgoing              = true
+t.61-8bit.notForOutgoing                = true
+utf-7.notForOutgoing                    = true
+x-imap4-modified-utf7.notForOutgoing    = true
+us-ascii.notForOutgoing                 = true
+iso-8859-6-e.notForOutgoing             = true
+iso-8859-6-i.notForOutgoing             = true
+ibm864i.notForOutgoing                  = true
+ibm869.notForOutgoing                   = true
+ibm1125.notForOutgoing                  = true
+ibm1131.notForOutgoing                  = true
+iso-8859-8-e.notForOutgoing             = true
 iso-8859-8.notForOutgoing               = true
 iso-2022-kr.notForOutgoing              = true
 x-windows-949.notForOutgoing            = true
diff --git a/intl/uconv/src/nsCharsetConverterManager.cpp b/intl/uconv/src/nsCharsetConverterManager.cpp
index 208f7769a5cf..a99076826ac0 100644
--- a/intl/uconv/src/nsCharsetConverterManager.cpp
+++ b/intl/uconv/src/nsCharsetConverterManager.cpp
@@ -117,7 +117,7 @@ bool nsCharsetConverterManager::IsInternal(const nsACString& aCharset)
   nsAutoString str;
   // fully qualify to possibly avoid vtable call
   nsresult rv = GetCharsetDataImpl(PromiseFlatCString(aCharset).get(),
-                                   NS_LITERAL_STRING(".isXSSVulnerable").get(),
+                                   NS_LITERAL_STRING(".isInternal").get(),
                                    str);
 
   return NS_SUCCEEDED(rv);