As you might be knowing, starting from version 29, Mozilla plans to ship Firefox with a new Australis UI, which is already available in the Nightly Builds of Firefox. Recently we covered how to disable Australis and restore the classic theme in Firefox. In the latest builds, Mozilla has added a native option to enable the titlebar for the Firefox window. When the titlebar is enabled, it shows the current page title and browser icon. To enable it, follow these simple steps.