How do we design a Safari App Extension if we don't really need an app?

We currently have an extension that runs stand alone on all browsers, are there examples of best practices for building an Safari App Extension that doesn't really need a Mac App?

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What we did was have a very simple app that just presented the user with a screen showing them how to activate the app via the Safari preferences pane, we also displayed a simple message to reflect the current activation state of our extension along with a button that would open the safari preferences pane automatically.