Files

T

Claude 4576597e64 feat: initial Silent Send browser extension

Chrome Manifest V3 extension that intercepts personal data and
substitutes it with user-defined replacements before sending to
Claude.ai. Hooks fetch() in the page's main world to catch API
requests, with bidirectional substitution (real→fake on send,
fake→real on display via reveal mode).

Includes popup UI with mapping management, live test/diff view,
activity log with badge count, options page with import/export,
and Shadow DOM traversal for Claude.ai compatibility.

https://claude.ai/code/session_01Dvgwe7XMoSxnWXkih8p1Cw

2026-03-25 23:26:13 +00:00

2.2 KiB

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Silent Send

A Chrome extension that intercepts personal information and substitutes it with user-defined replacements before sending to Claude.ai.

How it works

You define mappings — e.g. "John Smith" → "Alex Demo", "john@gmail.com" → "alex@example.com"
You type normally — you see your real text while composing
On send, it swaps — the extension intercepts the API request and replaces real values with substitutes
Badge shows count — the extension icon shows how many substitutions were made
Reveal mode — optionally translates Claude's responses back to your real data

How to verify it's working

Badge count on the extension icon shows substitutions per page
Activity tab in the popup shows a timestamped log of every substitution
Test tab in the popup lets you type text and see the before/after diff
Reveal mode (eye icon) toggles showing real vs substitute data in responses
Browser DevTools → Console shows [Silent Send] Substituted N value(s) messages

Installation (Developer Mode)

Clone this repo
Open chrome://extensions/ in Chrome
Enable Developer mode (top right)
Click Load unpacked
Select this directory
Navigate to claude.ai — the extension is active

No build step needed. No Chrome Web Store required.

Architecture

manifest.json           — Extension manifest (Manifest V3)
src/
  background/
    service-worker.js   — Badge management, logging coordination
  content/
    injector.js         — Content script (isolated world) — loads config, bridges messaging
    content.js          — Page script (main world) — hooks fetch(), does substitution
    content.css         — Visual indicators (highlights, reveals)
  popup/
    popup.html/css/js   — Quick access: add mappings, view activity, test mode
  options/
    options.html/css/js — Full mapping management, import/export, settings
  lib/
    substitution-engine.js — Core find/replace logic
    storage.js          — Chrome storage wrapper

Privacy

All data stays local in Chrome storage
No external servers, no telemetry, no analytics
The extension only activates on claude.ai

2.2 KiB Raw Blame History