I forked Chromium and went through the plumbing to embed a ReactJS/NextJS web app in its Side Panel like OpenAI's Atlas browser and Perplexity's Comet browser.

The Side Panel has access to the browser's DOM which you can pass as context to LLMs in your web app. Supports hot reloading for faster development.

Hopefully this is helpful for web devs who haven't, or don't want to, touch C++ and Chromium, but want to build a native AI experience into browsers.