Comment by tux3
Firefox already has something similar natively, but it's not enabled by default. If you turn on the new sidebar they have an AI panel, which basically looks like an iframe to the Claude/OAI/Gemini/etc chat interface. Different from Orbit.
That sidebar doesn't have the ability to do any actions on the browser tab, or have the data form the browser as a context in any way. It is just a simple iframe.