The item is a palette of available toolbar items. It is not displayed, but is used by the toolbar customization dialog to display the list of items. The children of the toolbarpalette should be the complete list of toolbarbuttons and toolbaritems that can be added to the toolbar. Do not add the various spacing items, as those are added automatically.
You can add your own custom buttons to the Firefox browser by using an overlay that overlays the toolbarpalette with the idBrowserToolbarPalette.
Thanks! Please check your inbox to confirm your subscription.
If you haven’t previously confirmed a subscription to a Mozilla-related newsletter you may have to do so. Please check your inbox or your spam filter for an email from us.
Why does MDN look different?
MDN is changing to focus just on documenting web technologies. All the same great content is still here; we’re just changing some visual elements and navigation, to help you more quickly find the web technology docs you’re looking for.
But don’t worry, MDN and Mozilla are still together! In fact, we're updating MDN’s look to reflect Mozilla's new logo and colors.