No install, no setup. The window below is a real, scriptable browser. The Nexus bridge “extension” is built into it, and the AI console drives real pages for real — the same click / type / read engine that ships in the actual Chrome extension.
Everything in this window is real DOM served from this site's origin, which is why the in-page agent can drive it. The real extension does the same to any tab — it just reaches it through the local bridge instead of an iframe.