An in-app browser pane for DeepSeek Harness

Key features

• Web pages open in a real Chrome, driven over the Chrome DevTools Protocol with its own persistent profile.
• A browser pane inside the harness, beside the chat.
• open_preview(url, label?) — a web page or a local file.
• A real browser is safer than the proxy it replaced, not riskier: cookies stay in Chrome's own encrypted store with per-origin isolation and SameSite enforced by the browser.
• Sites that refuse to be framed work, because nothing is being framed.