diff --git a/browser/base/content/browser.xul b/browser/base/content/browser.xul
index 0f8fa7c9eedb..002ca398059c 100644
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -359,10 +359,6 @@
     <!-- Bookmarks and history tooltip -->
     <tooltip id="bhTooltip"/>
 
-    <panel id="customizeToolbarSheetPopup"
-           noautohide="true"
-           sheetstyle="&dialog.dimensions;"/>
-
     <tooltip id="tabbrowser-tab-tooltip" onpopupshowing="gBrowser.createTooltip(event);"/>
 
     <tooltip id="back-button-tooltip">
diff --git a/browser/themes/osx/browser.css b/browser/themes/osx/browser.css
index b187b1239844..66ae9aa18d25 100644
--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -2683,10 +2683,6 @@ toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
   background-color: Highlight;
 }
 
-#customizeToolbarSheetPopup {
-  -moz-window-shadow: sheet;
-}
-
 /* Popup Icons */
 #identity-popup-icon {
   height: 64px;