Prompt Firewall — Privacy Policy

Last updated: 2026-04-28

Prompt Firewall is a local-first privacy guard for AI tools. We do not operate any backend for the extension, and we never receive your prompt data.

This website

These public pages (including this privacy policy) load Google Analytics (measurement ID G-79FS2L4G40) to measure traffic. Google may process data such as IP address and device information as described in Google’s Privacy Policy. The browser extension does not embed Google Analytics or other third-party analytics.

What the extension stores

All data is stored locally in your browser via chrome.storage.local:

• Your enable / disable toggle and Privacy Mode flag
• Statistics counters (for example, “warnings shown”)
• Your watchlist entries (terms you choose to flag)
• Your custom detection rules and document-mode toggles
• Your selected policy template
• Your bring-your-own-key API credentials (provider, key, model, endpoint)
• Your audit log of warning events — metadata only (timestamp, site, action taken, risk score, finding categories). No prompt content is ever stored.
• Your license key or trial start timestamp

What the extension transmits

In its default configuration, Prompt Firewall transmits nothing. All detection and redaction happen inside your browser.

The optional Sanitise Prompt feature sends the current prompt directly from your browser to the LLM provider you configured (OpenAI, Anthropic, Google Gemini, or your local Ollama endpoint), authenticated with your own API key. The extension does not proxy, log, or store these requests.

Privacy Mode

When Privacy Mode is on, the extension refuses to make any outbound request, including Sanitise calls to remote providers. Local Ollama remains available.

Third parties

The extension does not embed third-party analytics, advertising, or tracking SDKs.

Data subject rights

Because nothing is stored on a server, there is no remote data to access, export, or delete. To wipe local data, remove the extension or use the “Clear log” / “Reset statistics” buttons in the UI.

Contact

For privacy questions or bug reports, see Support (email support@promptfirewall.app) or the Support tab on this extension’s Chrome Web Store listing once it is published.