diff --git a/mozilla/suite/common/sidebar/sidebarOverlay.js b/mozilla/suite/common/sidebar/sidebarOverlay.js
index 0d156b5169c..c0164e46675 100644
--- a/mozilla/suite/common/sidebar/sidebarOverlay.js
+++ b/mozilla/suite/common/sidebar/sidebarOverlay.js
@@ -861,6 +861,12 @@ function SidebarStopPanelLoad(header) {
 function SidebarReload() {
   sidebarObj.panels.refresh();
 }
+ 
+function SidebarRebuild() {
+  var panels = document.getElementById("sidebar-panels");
+  panels.builder.rebuild();
+  sidebar_open_default_panel(100, 0);
+}
 
 // Set up a lame hack to avoid opening two customize
 // windows on a double click.