app/browser.md Codex Docs, 2026-04-24 12:28 UTC → 2026-05-07 20:02 UTC

6 6 

7Use it for local development servers, file-backed previews, and public pages7Use it for local development servers, file-backed previews, and public pages

8that don't require sign-in. For anything that depends on login state or browser8that don't require sign-in. For anything that depends on login state or browser

9extensions, use your regular browser.9extensions, use your regular browser or the

10[Codex Chrome extension](https://developers.openai.com/codex/app/chrome-extension).

10 11 

11Open the in-app browser from the toolbar, by clicking a URL, by navigating12Open the in-app browser from the toolbar, by clicking a URL, by navigating

12manually in the browser, or by pressing <kbd>Cmd</kbd>+<kbd>Shift</kbd>+<kbd>B</kbd>13manually in the browser, or by pressing <kbd>Cmd</kbd>+<kbd>Shift</kbd>+<kbd>B</kbd>

18 19 

19Treat page content as untrusted context. Don't paste secrets into browser flows.20Treat page content as untrusted context. Don't paste secrets into browser flows.

20 21 

21![Codex app showing a browser comment on a local web app preview](/images/codex/app/in-app-browser-light.webp)22<CodexScreenshot

23 alt="Codex app showing a browser comment on a local web app preview"

24 lightSrc="/images/codex/app/in-app-browser-light.webp"

25 darkSrc="/images/codex/app/in-app-browser-dark.webp"

26 maxHeight="420px"

27 variant="no-wallpaper"

28/>

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23## Browser use30## Browser use

24 31 

42the allowed list means Codex asks again before using it; removing a site from the49the allowed list means Codex asks again before using it; removing a site from the

43blocked list means Codex can ask again instead of treating it as blocked.50blocked list means Codex can ask again instead of treating it as blocked.

44 51 

52For signed-in websites in Chrome, see

53[Codex Chrome extension](https://developers.openai.com/codex/app/chrome-extension).

54 

45## Preview a page55## Preview a page

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471. Start your app's development server in the [integrated terminal](https://developers.openai.com/codex/app/features#integrated-terminal) or with a [local environment action](https://developers.openai.com/codex/app/local-environments#actions).571. Start your app's development server in the [integrated terminal](https://developers.openai.com/codex/app/features#integrated-terminal) or with a [local environment action](https://developers.openai.com/codex/app/local-environments#actions).