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Privacy Policy
Nostr Signer doesn't collect any personal data, doesn't track websites you visit, doesn't collect any form of usage analytics, doesn't sends any information to any service over the internet -- in fact, it doesn't even have a server anywhere, it's just an extension installed in your computer.
The only places Nostr Signer sends information to are the URL endpoints you define in the settings page for the extension, the URLs that identify the Lightning nodes you want to talk to, which Nostr Signer assumes are under your control or under the control of a third-party you trust.
Nostr Signer stores only the information you explicitly write in the settings page: node URL, username and password (where applicable). That information, however, is only stored in your own browser, using the local storage mode, not the synced storage mode that saves data to a browser-determined sync server. So if the guarantees offered by the browser itself hold true that information never leaves your browser.
For more information on the browser guarantees on which Nostr Signer depends, please read Firefox's Privacy Policy and Terms of Service and Google Chrome Privacy Policy and Terms of Service.