While @OpenAI throws its weight behind a fundamental rethinking of the browser through an AI lens in ChatGPT Atlas, Firefox, which peaked in 2009, continues to hold on to internet ideals from the same period.
As such, it is pursuing the easily-jettisoned strategy of exploring adding an "AI Window" to Firefox, like a back alley where internet users can go "do their nasty", but not have it pollute their regular web usage.