One-Click Print to PDF does not collect, store, or transmit any user data. It makes no network requests and contains no analytics or third party code. The current tab's title and address are read only at the moment you invoke a save, used to build the suggested filename, and discarded. Settings you choose are stored in Firefox's own sync storage and go nowhere else. The complete source code is available at https://github.com/JonGaydos/firefox-print-pdf.