The full TheDualWeb Privacy Policy is available at:

https://thedualweb.com/privacy

The extension sends user-submitted contact numbers to TheDualWeb's first-party API only when the user starts an availability check. Selected TXT or single-column CSV files are read and validated locally; file contents and file names are not uploaded.

Temporary pairing credentials and the session token are stored in Firefox local extension storage so the authorized connection can continue across extension openings. Number lists and results are not stored persistently by the extension or retained by the production service after processing.