AI browser / Agentic browser

A browser with a built-in AI agent that navigates, clicks, fills out forms, and reads content on the user's behalf. Perplexity Comet as the first mainstream product, OpenAI Atlas (October 2025) as the response. It opens a new class of security attacks (prompt injection via web pages). It heralds the end of the "OK Google" / "Hey Siri" era as the primary AI UI.