Haven PDF collects no personal data. The extension stores nothing permanently and sends no data to any server. It only opens havenpdf.com and, when you choose, hands a PDF you right-click to that page locally (browser-to-browser) — nothing is uploaded. The optional site-access permission is used only to fetch the specific PDF you open, and only if you enable "Auto-open PDFs". Full policy: https://havenpdf.com/en/privacy/