From the Changelog:
More Codex app capabilities are rolling out to users in the European Economic Area, the United Kingdom, and Switzerland:
Computer Use is available on macOS and Windows in these regions. It allows Codex to operate desktop apps by seeing, clicking, and typing.
The Codex Chrome extension is available for browser tasks that need signed-in Chrome context. It can work across tabs in the background without taking over your browser.
Memories can remember useful preferences, recurring workflows, tech stacks, and repository conventions when enabled. Memories are off by default in the European Economic Area, the United Kingdom, and Switzerland.
Chronicle is available as an opt-in research preview for ChatGPT Pro subscribers on macOS. It helps Codex build memories from recent screen context.