The plug-in provides a scripting interface that's only available to pages hosted via HTTPS on apple.com. The scripting interface exposes whether Safari is the d

The plug-in provides a scripting interface that's only available to pages hosted via HTTPS on apple.com. The scripting interface exposes whether Safari is the default browser, and allows for prompting the user to change their default browser. To my knowledge the only place this was used was a "Welcome to OS X Mavericks" page that was shown shortly after installation of that version of OS X. I doubt that it's been used since.