# Keystone Privacy Shield

> Zero-knowledge privacy for AI chats. Redacts PII before it reaches ChatGPT, Claude, or any LLM.

Canonical page: [https://chrome-stats.com/d/keystone-privacy-shield](https://chrome-stats.com/d/keystone-privacy-shield)

## Overview

- **ID:** `keystone-privacy-shield`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** karan
- **Category:** privacy-security
- **Daily users:** 1
- **Version:** 0.2.4
- **Last updated:** 2026-09-03
- **First published:** 2026-07-27
- **Size:** 86 KB
- **Data as of:** 2026-09-14
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/keystone-privacy-shield/)
- **Website:** [https://keystone-website-psi.vercel.app/](https://keystone-website-psi.vercel.app/)

## Description

eystone Privacy Shield protects your sensitive data when using AI tools. It works as a local privacy layer between you and cloud AI services — all processing happens on your machine.

<strong>Features:</strong>
  - Automatic PII detection (names, emails, phone numbers, addresses, and more)
  - Real-time highlighting of detected entities while you type
  - One-click redaction before sending to AI
  - Smart restoration with interactive badges in AI responses
  - Right-click context menu for manual redaction
  - Per-site safe lists — mark words as safe so they're never redacted
  - Zero-knowledge architecture — your data never leaves your machine

<strong>How it works:</strong>
  1. Type a message in ChatGPT, Claude, Gemini, or Perplexity
  2. Keystone detects personal information automatically
  3. PII is replaced with safe placeholders before sending
  4. When the AI responds, Keystone restores your real data locally

<strong>Requires</strong> the Keystone desktop application running locally for PII detection.

<strong>Supported sites:</strong> ChatGPT, Claude, Gemini, Perplexity

## Rankings

- #93,297 — Overall
- #226 — privacy
- #227 — data privacy

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `contextMenus`

### Host permissions

- `http://localhost:8000/*`
- `http://127.0.0.1:8000/*`

### Content script matches

- `chatgpt.com`
- `chat.openai.com`
- `claude.ai`
- `gemini.google.com`
- `www.perplexity.ai`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Request access to the following domains: chatgpt.com, openai.com, claude.ai, google.com, perplexity.ai, localhost, 0.1
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/keystone-privacy-shield)