--- a/browser/components/customizableui/content/panelUI.inc.xul
+++ b/browser/components/customizableui/content/panelUI.inc.xul
@@ -555,29 +555,32 @@
                        key="key_newNavigator"
                        command="cmd_newNavigator"/>
         <toolbarbutton id="appMenu-private-window-button"
                        class="subviewbutton subviewbutton-iconic"
                        label="&newPrivateWindow.label;"
                        key="key_privatebrowsing"
                        command="Tools:PrivateBrowsing"/>
         <toolbarseparator/>
-        <toolbaritem id="appMenu-zoom-controls" class="toolbaritem-combined-buttons" closemenu="none">
+        <toolbaritem id="appMenu-zoom-controls" class="toolbaritem-combined-buttons">
           <label value="&fullZoom.label;"/>
           <toolbarbutton id="appMenu-zoomReduce-button"
                          class="subviewbutton subviewbutton-iconic"
                          command="cmd_fullZoomReduce"
+                         closemenu="none"
                          tooltip="dynamic-shortcut-tooltip"/>
           <toolbarbutton id="appMenu-zoomReset-button"
                          class="subviewbutton"
                          command="cmd_fullZoomReset"
+                         closemenu="none"
                          tooltip="dynamic-shortcut-tooltip"/>
           <toolbarbutton id="appMenu-zoomEnlarge-button"
                          class="subviewbutton subviewbutton-iconic"
                          command="cmd_fullZoomEnlarge"
+                         closemenu="none"
                          tooltip="dynamic-shortcut-tooltip"/>
           <toolbarseparator orient="vertical"/>
           <toolbarbutton id="appMenu-fullscreen-button"
                          class="subviewbutton subviewbutton-iconic"
                          observes="View:FullScreen"
                          type="checkbox"
                          tooltip="dynamic-shortcut-tooltip"/>
         </toolbaritem>