Claude gets its own browser inside Cowork, deliberately walled off from your real one.

Anthropic shipped a browser built into Cowork on desktop, so Claude can navigate, read pages, fill forms and gather information while you keep working in your own browser. It never sees your tabs, bookmarks or passwords; you selectively import logins from Chrome, Edge or Firefox, with banking, email and SSO sites blocked unless explicitly enabled (Anthropic). Rolling out through the week to Pro, Max and Team on macOS, Windows and Linux, enabled by default. Anthropic's own guidance splits the products cleanly: the built-in browser for new web tasks, Claude in Chrome for pages you already have open with live sessions.