I've come to the same conclusion as op, created a CLI tool to work with Chrome sessions. It works well, and I'm planning to do some token comparison on this vs an MCP approach. https://news.ycombinator.com/item?id=47207790
It does so many things though, very similar in the core though. I'm wondering what the token counts will be when I compare. Also the agent browser seems to support other browsers too, I only when with chromium