Keystone Privacy Shield

Name: Keystone Privacy Shield
Author: karan

By: karan Add-on

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

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-08-04

Version:

0.1.1

Last updated: 2026-07-31

Features & Capabilities

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.

Features:

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

How it works:

Type a message in ChatGPT, Claude, Gemini, or Perplexity
Keystone detects personal information automatically
PII is replaced with safe placeholders before sending
When the AI responds, Keystone restores your real data locally

Requires the Keystone desktop application running locally for PII detection.

Supported sites: ChatGPT, Claude, Gemini, Perplexity

User Growth & Download Statistics

Add-on

By:

karan

Daily users:

Version:

0.1.1 Last updated: 2026-07-31

Version code:

6386645

Creation date:

2026-07-27

Risk:

Permissions:

Host permissions:

http://localhost:8000/*
http://127.0.0.1:8000/*

Content scripts matches:

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

Size:

85.84KB

Email:

ka*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-08-04

Compare stats and ranking:

Ranking

# 123,623 ▲

Other rankings

#211 in privacy keyword 57 ▲ #212 in data privacy keyword 31 ▲

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

karan

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/keystone-privacy-shield/

Email:

ka*****@gmail.com

Website:

https://keystone-website-psi.vercel.app/

Is Keystone Privacy Shield Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Keystone Privacy Shield requires a lot of sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Request access to the following domains: chatgpt.com, openai.com, claude.ai, google.com, perplexity.ai, localhost, 0.1
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Keystone Privacy Shield is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
High **** ********* *** ******** ****** *** ********** *** *** ** ****** ** *****
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****