diff --git a/editor/ui/composer/content/MANIFEST b/editor/ui/composer/content/MANIFEST
index f81292473e87..1965544277cd 100644
--- a/editor/ui/composer/content/MANIFEST
+++ b/editor/ui/composer/content/MANIFEST
@@ -31,7 +31,6 @@ EditorStyles1.css
 EditorContent.css
 editorOverlay.js
 editorOverlay.xul
-contentframe.xul
 sidebar-editor.rdf
 sidebar-editor.xul
 sb-bookmarks-panel.xul
diff --git a/editor/ui/composer/content/Makefile.in b/editor/ui/composer/content/Makefile.in
index e2c59215f8bd..b39aa094dcd3 100644
--- a/editor/ui/composer/content/Makefile.in
+++ b/editor/ui/composer/content/Makefile.in
@@ -33,7 +33,6 @@ EXPORT_RESOURCE_CONTENT = \
 		$(srcdir)/EditorInitPagePlain.html \
 		$(srcdir)/EditorStyles1.css \
 		$(srcdir)/EditorContent.css \
-		$(srcdir)/contentframe.xul \
 		$(srcdir)/sidebar-editor.rdf \
 		$(srcdir)/sidebar-editor.xul \
 		$(srcdir)/sb-bookmarks-panel.xul \
diff --git a/editor/ui/composer/content/contentframe.xul b/editor/ui/composer/content/contentframe.xul
deleted file mode 100644
index 8d5951828f8f..000000000000
--- a/editor/ui/composer/content/contentframe.xul
+++ /dev/null
@@ -1,49 +0,0 @@
-<?xml version="1.0"?> 
-
-<!--
-   - The contents of this file are subject to the Netscape Public
-   - License Version 1.1 (the "License"); you may not use this file
-   - except in compliance with the License. You may obtain a copy of
-   - the License at http://www.mozilla.org/NPL/
-   -  
-   - Software distributed under the License is distributed on an "AS
-   - IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
-   - implied. See the License for the specific language governing
-   - rights and limitations under the License.
-   -  
-   - The Original Code is Mozilla Communicator client code, released
-   - March 31, 1998.
-   - 
-   - The Initial Developer of the Original Code is Netscape
-   - Communications Corporation. Portions created by Netscape are
-   - Copyright (C) 1999 Netscape Communications Corporation. All
-   - Rights Reserved.
-   - 
-   - Contributor(s): 
-   -    Ben Goodger
-  -->
-
-<?xml-stylesheet href="chrome://global/skin/" type="text/css"?> 
-<?xml-stylesheet href="chrome://navigator/skin/contentframe.css" type="text/css"?> 
-
-<!DOCTYPE window> 
-
-<window style="height:100%;width:100%"
-   xmlns:html="http://www.w3.org/TR/REC-html40"
-   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-   onload="init_sidebar('editor',
-                        'chrome://editor/content/sidebar-editor.xul',
-                        170);" align="horizontal"> 
-
-<!-- use navigator's contentframe.js... ideally we only 
-     need one... not many -->
-<html:script src="chrome://navigator/content/contentframe.js" />
-
-  <html:iframe id="sidebarframe" class="sidebarframe" src="chrome://editor/content/sidebar-editor.xul" />
-  <titledbutton id="grippy" class="grippy" onclick="toggle_open_close();"/>
-  <!-- type attribute is used by frame construction to locate iframes
-       intended to hold (html) content -->
-  <!-- id's use is a mystery -->
-  <html:iframe type="content-primary" id="content-frame" src="about:blank" flex="100%"/>
-
-</window>
diff --git a/editor/ui/composer/content/makefile.win b/editor/ui/composer/content/makefile.win
index 083e3329a56c..5670a8aa8b94 100644
--- a/editor/ui/composer/content/makefile.win
+++ b/editor/ui/composer/content/makefile.win
@@ -27,7 +27,6 @@ install::
 	$(MAKE_INSTALL) EditorInitPagePlain.html   $(DIST)\bin\chrome\editor\content\default
 	$(MAKE_INSTALL) EditorStyles1.css          $(DIST)\bin\chrome\editor\content\default
 	$(MAKE_INSTALL) EditorContent.css          $(DIST)\bin\chrome\editor\content\default
-	$(MAKE_INSTALL) contentframe.xul           $(DIST)\bin\chrome\editor\content\default
 	$(MAKE_INSTALL) sidebar-editor.rdf         $(DIST)\bin\chrome\editor\content\default
 	$(MAKE_INSTALL) sidebar-editor.xul         $(DIST)\bin\chrome\editor\content\default
 	$(MAKE_INSTALL) sb-bookmarks-panel.xul     $(DIST)\bin\chrome\editor\content\default
@@ -49,7 +48,6 @@ clobber::
   rm -f $(DIST)\bin\chrome\editor\content\default\EditorInitPagePlain.html	
   rm -f $(DIST)\bin\chrome\editor\content\default\EditorStyles1.css
   rm -f $(DIST)\bin\chrome\editor\content\default\EditorContent.css
-  rm -f $(DIST)\bin\chrome\editor\content\default\contentframe.xul
   rm -f $(DIST)\bin\chrome\editor\content\default\sidebar-editor.rdf
   rm -f $(DIST)\bin\chrome\editor\content\default\sidebar-editor.xul
   rm -f $(DIST)\bin\chrome\editor\content\default\sb-bookmarks-panel.xul