Having something that read everything I read and could talk with me about it, help remember things and synthesize? That’s awesome. Follow links and check references.

This use case feels better served by a dedicated utility with a specialized UI rather than shoehorned into a browser. It'd fit the macOS services model (which adds items to context and application menus, e.g. "Research this…" when right-clicking a link or text selection) and could optionally also be summoned by the system app launcher (like Spotlight).