The blog post notes that the Safari that is driven by the automation cannot interact with other windows or user preferences. It also requires that the user has

The blog post notes that the Safari that is driven by the automation cannot interact with other windows or user preferences. It also requires that the user has had the "enable remote automation" enablex, which is only possible if you have enabled the developer menu bar. In addition, automation windows are shown with a different coloured bar and have a "pane" over the window so that it won't receive stray mouse or keyboard input.