favowe's full privacy policy applies: https://favowe.com/privacy/

Extension specifics in short: The extension talks only to favowe's own backend — no third-party requests, no tracking, no analytics, no ads. While you are connected, the address (host and path, without query parameters) of the page in the active tab is sent to favowe's own backend to show the "already saved" check mark — it is compared against your own links only, is not stored, and the indicator can be switched off entirely in the extension's settings. Optional page text capture (off by default) uploads the visible text of a page to your private favowe account only when you click save — never in the background, never in private windows, never on banking or webmail sites (built-in exclusion list); form input is never read. Section 8 of the privacy policy describes the extension's data flows in detail.