--- a/browser/components/customizableui/content/panelUI.inc.xul
+++ b/browser/components/customizableui/content/panelUI.inc.xul
@@ -432,16 +432,17 @@
                      label="&updateAvailable.header.message;"
                      buttonlabel="&updateAvailable.acceptButton.label;"
                      buttonaccesskey="&updateAvailable.acceptButton.accesskey;"
                      closebuttonhidden="true"
                      secondarybuttonlabel="&updateAvailable.cancelButton.label;"
                      secondarybuttonaccesskey="&updateAvailable.cancelButton.accesskey;"
                      dropmarkerhidden="true"
                      checkboxhidden="true"
+                     buttonhighlight="true"
                      hidden="true">
     <popupnotificationcontent id="update-available-notification-content" orient="vertical">
       <description id="update-available-description">&updateAvailable.message;
         <label id="update-available-whats-new" class="text-link" value="&updateAvailable.whatsnew.label;" />
       </description>
     </popupnotificationcontent>
   </popupnotification>
 
@@ -450,16 +451,17 @@
                      label="&updateManual.header.message;"
                      buttonlabel="&updateManual.acceptButton.label;"
                      buttonaccesskey="&updateManual.acceptButton.accesskey;"
                      closebuttonhidden="true"
                      secondarybuttonlabel="&updateManual.cancelButton.label;"
                      secondarybuttonaccesskey="&updateManual.cancelButton.accesskey;"
                      dropmarkerhidden="true"
                      checkboxhidden="true"
+                     buttonhighlight="true"
                      hidden="true">
     <popupnotificationcontent id="update-manual-notification-content" orient="vertical">
       <description id="update-manual-description">&updateManual.message;
         <label id="update-manual-whats-new" class="text-link" value="&updateManual.whatsnew.label;" />
       </description>
     </popupnotificationcontent>
   </popupnotification>
 
@@ -468,16 +470,17 @@
                      label="&updateRestart.header.message2;"
                      buttonlabel="&updateRestart.acceptButton.label;"
                      buttonaccesskey="&updateRestart.acceptButton.accesskey;"
                      closebuttonhidden="true"
                      secondarybuttonlabel="&updateRestart.cancelButton.label;"
                      secondarybuttonaccesskey="&updateRestart.cancelButton.accesskey;"
                      dropmarkerhidden="true"
                      checkboxhidden="true"
+                     buttonhighlight="true"
                      hidden="true">
     <popupnotificationcontent id="update-restart-notification-content" orient="vertical">
       <description id="update-restart-description">&updateRestart.message2;</description>
     </popupnotificationcontent>
   </popupnotification>
 </panel>
 
 <menupopup id="customizationPaletteItemContextMenu">