OpenAI shipped a Codex Chrome extension that puts its coding agent inside the browser tab you already have open. Instead of copying a stack trace into ChatGPT or alt-tabbing to a desktop IDE, you trigger Codex on the page itself — the bug report, the staging site, the API docs you're reading. The pitch is simple. Developers spend a meaningful share of their day in Chrome (Linear tickets, GitHub PRs, Stripe dashboards, Vercel logs, internal admin panels), and most of those surfaces produce code, configuration, or text that has to get pasted somewhere else. Moving the agent into the page collapses the loop. That sounds obvious until you actually try it. The interesting questions are about scope, latency, and trust — not novelty. What Codex in Chrome actually changes The extension exposes Codex against the active tab's DOM and your selection.…