Deep Debug Frontend Issues with Codex Developer Mode
Enable Developer Mode for deep browser-based debugging within Codex.
Turn on 'Developer mode' in Codex app settings to grant the AI access to Chrome DevTools Protocol for advanced debugging of network traffic and DOM states.
The Scenario
You are debugging a complex frontend issue where a web element isn't styling correctly or a network request is failing. You need the AI to 'see' the underlying browser state to fix it.
Before & after
Developers manually open Chrome DevTools, record performance profiles, and copy-paste console errors into the AI to ask for help. This trial-and-error process takes 15–25 minutes.
Enable 'Developer mode' in settings to get direct access to the Chrome DevTools Protocol for profiling and debugging. Initial setup takes 2 minutes.
The Prompt
Analyze the performance of the current page in Developer Mode and identify why the [SPECIFIC_ELEMENT] is rendering slowly.
Developer mode provides controlled Chrome DevTools Protocol (CDP) access for network profiling, DOM state analysis, and runtime error debugging within the Codex browser.
Source
ChatGPT Business - Release Notes | OpenAI Help Center"Developer mode lets Codex use controlled Chrome DevTools Protocol (CDP) access for performance profiling and deeper debugging"