Summary
Codex IDE versions 0.4.71 and newer (including current pre-release builds) do not function in Firebase Studio. The Codex panel activates but never finishes loading and remains stuck on an infinite spinner.
Observed behavior
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Codex extension installs successfully.
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Codex activates but the UI never renders.
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The panel remains in a perpetual loading state.
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This occurs on both stable and pre-release Codex versions.
Working version
- Codex v0.4.68 works correctly in the same Firebase Studio environment.
Root cause (from logs)
Extension logs consistently show errors similar to:
chat.registerChatSessionItemProvider is not a function
This indicates that newer Codex versions rely on VS Code chat APIs that are not available in Firebase Studio’s Code OSS build.
Conclusion
This appears to be a Firebase Studio / Code OSS compatibility issue, not a user configuration or cache problem. Until Firebase Studio updates its VS Code runtime to include the required chat APIs, Codex versions newer than 0.4.68 cannot function properly.