Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of SafePrompt

SafePrompt by SafePrompt

SafePrompt — protection des donnees sensibles dans vos prompts LLM (100% local)

5 (1 review)5 (1 review)
Download Firefox and get the extension
Download file

Extension Metadata

Screenshots
Hover a restored value: 'SafePrompt restored this value locally — it never reached the LLM' (Gemini shown)Tokens ⟦EMAIL_1⟧, ⟦PHONE_1⟧, ⟦FR_NIR_1⟧, ⟦CREDIT_CARD_1⟧, ⟦IBAN_1⟧ replace the original PII before ChatGPT receives the promptExtension popup: current plan, weekly counters (secrets blocked, PII tokenized), recent activity, deep-link to dashboardDashboard overview with install reminder + 7-day stats (incidents, secrets blocked, PII tokenized, PII sent in clear)Analytics: 12-week incident trend, entity-type breakdown, top users — visibility for the tenant admin
About this extension
SafePrompt protects your sensitive data before it reaches ChatGPT, Claude, Gemini, DeepSeek, Qwen, OpenRouter, and Mistral Le Chat.

100% LOCAL — NO DATA LEAVES YOUR BROWSER

All processing (detection, tokenization, rehydration) happens inside your browser. SafePrompt never sends your prompts to a third-party server. GDPR-compliant by design.

AUTOMATIC DETECTION AND MASKING

Before your prompt is sent, SafePrompt detects:
- Secrets: API keys (AWS, GitHub, Stripe, OpenAI), JWT tokens, plaintext passwords
- Personal identifiers: email, phone, IBAN, credit card number
- French identifiers: SIRET, SIREN, social security number (NIR), VAT number
- Postal addresses, dates of birth

Secrets are blocked (fail-closed); personal data is automatically replaced with tokens (⟦EMAIL_1⟧, ⟦FR_SIREN_2⟧, etc.) before sending.

TRANSPARENT REHYDRATION

When the LLM replies with the tokens, SafePrompt restores the original values — only inside your browser. Hover a restored token → tooltip confirms "SafePrompt restored this value locally". The LLM never saw the original data.

7 SUPPORTED PLATFORMS
  • ChatGPT (chatgpt.com)
  • Claude (claude.ai)
  • Gemini (gemini.google.com)
  • Qwen (chat.qwen.ai)
  • DeepSeek (chat.deepseek.com)
  • OpenRouter (openrouter.ai)
  • Mistral Le Chat (chat.mistral.ai)

TEAM DASHBOARD

Solo Paid, Starter, and Business plans include a centralized dashboard on safeprompt.m-kis.fr: incident visibility, seat management, audit log, per-tenant anonymization (SHA256 + salt), GDPR export.

PLANS
  • Solo Free — free, secrets detection only
  • Solo Paid — €5/month, full secrets + PII detection
  • Starter — €12/seat/month (5–49 seats), team dashboard
  • Business — €8/seat/month (50+ seats), anonymization, priority support

SECURITY AND COMPLIANCE
  • No "<all_urls>" permission — host_permissions limited to the 7 supported LLMs
  • GDPR by default: no personal data sent to third parties
  • Manifest V3 compliant, regular dependency audits

SafePrompt is published by M-KIS (https://m-kis.fr), a Lorraine-based agency specialized in cybersecurity and responsible AI.

Support & questions: contact@m-kis.fr
Rated 5 by 1 reviewer
Sign in to rate this extension
There are no ratings yet

Star rating saved

5
1
4
0
3
0
2
0
1
0
Read 1 review
Permissions and data

Required permissions:

  • Access your data for chatgpt.com
  • Access your data for claude.ai
  • Access your data for gemini.google.com
  • Access your data for chat.qwen.ai
  • Access your data for chat.deepseek.com
  • Access your data for openrouter.ai
  • Access your data for chat.mistral.ai

Optional permissions:

  • Access your data for sites in the sentry.io domain
  • Access your data for sites in the ingest.sentry.io domain
  • Access your data for chatgpt.com
  • Access your data for claude.ai
  • Access your data for gemini.google.com
  • Access your data for chat.qwen.ai
  • Access your data for chat.deepseek.com
  • Access your data for openrouter.ai
  • Access your data for chat.mistral.ai
Learn more
More information
Add-on Links
  • Support site
  • Support Email
  • Copy add-on ID
Version
0.1.4
Size
1.86 MB
Last updated
21 days ago (May 28, 2026)
Related Categories
  • Web Development
  • Privacy & Security
License
All Rights Reserved
Privacy Policy
Read the privacy policy for this add-on
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla’s homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.