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You don’t need this to protect the browser today. The desktop agent already covers ChatGPT and Claude in the browser by inspecting network traffic. This extension is a planned enhancement on top — it isn’t in the current release.

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What’s covered now vs. what this adds

Your team uses…Today
Cursor, IDE assistants, SDK/API tools✅ Desktop agent
ChatGPT / Claude in the browser✅ Desktop agent
Gemini in the browser⏳ Roadmap
In-page coaching before send · no certificate to install · resilience to web-app changes⏳ This extension

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Why build an extension if the agent already covers the browser?

Three things the desktop agent can’t do from the network layer:

Coach before send

Warn the employee as they type or paste, instead of after the request is already blocked.

No certificate needed

Works in locked-down environments where you can’t install a system certificate or proxy.

Survives app changes

Reads the page directly, so it keeps working when an AI web app changes its internal API.

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What it will do

When released, the extension runs inside the page and catches sensitive content at the moment it would leave — the right place to stop a leak:
  • Paste — the classic exfil move (dropping a customer table into Claude).
  • Submit — the Enter key or the site’s Send button.
  • File upload — reads text and PDF attachments before they upload.
On a block or redact it shows a clear overlay with the reason, a confidence score, and an audit reference; for redaction it offers a masked, safe version to send instead. Detection runs in the same PromptGuard engine — the only thing done in the browser is the masking itself. It enforces at paste / submit / upload and does not key-log.

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How it will ship

Chromium browsers first (Chrome, Edge, Brave, Arc), then Firefox and Safari. For rollout, you’ll force-install it via Chrome/Edge Enterprise policy (MDM) so it can’t be quietly disabled, pointed at your engine (cloud or self-hosted) with a device credential from fleet enrollment.

Cover the browser today with the desktop agent

Install it now — ChatGPT and Claude in the browser are protected out of the box.