Prolific browser extension privacy concerns

I noticed that the extension breaks (states ERR) if you change site access to on click. As seen on the permissions, it is not needed for notifications, which I thought was the purpose of this extension. Does anyone know what they are doing with this site access?

submitted by /u/Awkward_Eye5571
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source https://www.reddit.com/r/beermoney/comments/13dxftn/prolific_browser_extension_privacy_concerns/