zhishile/codex-auth-helper

Codex Auth Helper is a Chrome browser extension that exports your active ChatGPT session credentials into a local configuration file that Codex can use for authentication. If you are already logged into ChatGPT in your browser, the extension reads your session token directly from the browser's local state and packages it into the format Codex expects, without sending anything to an external server. When you open the extension popup, it shows your account details: profile avatar, email address, subscription plan (Free, Plus, or Pro), and a live countdown showing how much time remains before the current session token expires. Clicking the export button downloads an auth.json file to your computer using a data URL approach, which avoids leaving temporary files in browser memory. The extension requests only two permissions: downloads (to save the file) and access to chatgpt.com (to read the session data). No third-party libraries are loaded from external CDNs, all code runs locally. The authors note that you can open browser developer tools and inspect popup.js and background.js yourself to verify what the extension does. The extension is built for Chrome using Manifest V3. Installation requires loading it manually through Chrome's developer mode rather than through the Chrome Web Store. The interface uses a glassmorphism visual style with frosted glass elements and animated feedback. The project notes that session tokens are highly sensitive credentials and should never be shared or uploaded anywhere. It is released under MIT license.