The Ooh Fa Fa browser extension is restricted to only accessing data on your Fathom Analytics dashboard, i.e. pages hosted at the URL https://app.usefathom.com
This extension only collects data in the form of settings (preferences) that you select, such as chart color. They are saved locally in your browser only. None of your Fathom Analytics data is collected.
This extension does not send any data externally.