Cognito - Fullscreen for Claude Artifacts

One click to go fullscreen. Esc to come back. Cognito adds a small toggle button to the top-right corner of any Claude conversation that has a visible artifact. Click it to expand the artifact edge-to-edge - filling your entire browser window. No frame, no sidebar, no clutter. The artifact stays exactly where it is in the page - nothing is moved or reloaded. State, scroll position, and interactivity are all preserved through the transition and back. One CSS layer, no side effects. The extension is purely visual - it resizes an element on your screen. It cannot read your conversations, access your account, or interact with Claude in any way. No network requests, no data storage, no background processes. The full source is open at github.com/semicognito/cognito-fullscreen.