diff --git a/xpfe/components/prefwindow/resources/content/pref.xul b/xpfe/components/prefwindow/resources/content/pref.xul
index e06eb673c762..ddb7cc0729bd 100644
--- a/xpfe/components/prefwindow/resources/content/pref.xul
+++ b/xpfe/components/prefwindow/resources/content/pref.xul
@@ -40,6 +40,27 @@
           var element = document.getElementById( "cookiesCell" );
           element.setAttribute( "value", element.getAttribute( "valueWithImages" ) );
         }      
+      // Test for presence of "winhooks" component.
+      var showWinhooks = false;
+      try {
+          var winhooks = Components.classes["component://mozilla/winhooks"].getService();
+          if ( winhooks ) {
+              showWinhooks = true;
+          }
+      }
+      catch(e) {
+      }
+      if ( !showWinhooks ) {
+          // Hide this tree element.
+          try {
+            var cell = document.getElementById( "winhooks" );
+            if ( cell ) {
+                cell.parentNode.removeChild( cell );
+            }
+          }
+          catch(e) {
+          }
+      }
     }
   
   ]]>
diff --git a/xpfe/components/prefwindow/resources/content/preftree.xul b/xpfe/components/prefwindow/resources/content/preftree.xul
index 4b10b39519b5..6f13bbb88c18 100644
--- a/xpfe/components/prefwindow/resources/content/preftree.xul
+++ b/xpfe/components/prefwindow/resources/content/preftree.xul
@@ -214,6 +214,12 @@
             <treecell class="treecell-indent" url="chrome://communicator/content/pref/pref-mousewheel.xul" value="&mousewheel.label;"/>
           </treerow>
         </treeitem>
+        <treeitem id="winhooks">
+          <treerow>
+            <treecell class="treecell-indent" url="chrome://communicator/content/pref/pref-winhooks.xul" value="&winhooks.label;"/>
+          </treerow>
+        </treeitem>
+
       </treechildren>
     </treeitem>