Codex App in-app browser does not render iframes on localhost
Open 💬 0 comments Opened Apr 30, 2026 by kylerc
What version of the Codex App are you using (From “About Codex” dialog)?
Version 26.422.30944 (2080)
What subscription do you have?
ChatGPT Business
What platform is your computer?
Darwin 25.3.0 arm64 arm
What issue are you seeing?
When using the codex in app browser on a https://localhost:{port} url, iframes on the page do not seem to render. The network tab shows (blocked:other) as the status for loading the iframes. This seems to happen for many iframes, including iframes that work in the browser when not on a localhost url.
What steps can reproduce the bug?
navigate to a https://localhost:{port} url which has an iframe on it and observe the iframe never load and be blocked according to the dev network tools.
What is the expected behavior?
I'd expect the iframe to load.
Additional information
_No response_