Extension UI fails to start

“Codex IDE extension version 26.1021.22027 fails to initialize its user interface in Visual Studio Code 1.143.1 on Windows.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/codex/issues/20873/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Fading. 30 reports and thumbs-up in the last 7 days and 84 the week before. A workaround is known.

Extension UI fails to start with service worker error. After upgrading the VS Code extension on Windows, the Codex sidebar webview does not load and Codex is unusable.

Is this your bug?

File my report

Where: VS Code extension
Error text: InvalidStateError: Failed to register a ServiceWorker: The document is in an invalid state.
Versions: 26.1021.22027 to 26.51021.22027. Still reported on the newest version, 26.51021.22027.
Platforms: Windows
How bad: Most reports say it used to work. Some reports say it blocks them completely.

Part of: Codex VS Code extension shows "Codex could not start" and its sidebar UI never loads9 bugs

Original reports3, newest first

Nov 4, 2026codex user interface pro...On GitHub#59346
Oct 24, 2026Codex 26.1021.22027 fails to start UI in VS Code 1.143.1 on WindowsOn GitHub#56691
Oct 24, 2026UI doesn't start in VS Code extension 26.51021.22027On GitHub#56655