Show HN: We Turned Codex Into In-browser AI Agent!! (github.com)

AI Republic announced "Codex for Chrome" (potentially rebranded to BrowserX), an open-source, in‑browser AI agent that interprets natural-language commands and autonomously interacts with web pages. Built from OpenAI’s open-source Codex reference, the Chrome extension is positioned as a privacy-focused automation tool that aims to run inference client-side to keep data local and avoid backend infrastructure. The project is in alpha, currently supports OpenAI GPT‑5 via API (with Anthropic, Google Gemini and others listed as in‑development), and explicitly prohibits commercial redistribution during the alpha phase while planning an eventual Apache 2.0 release pending trademark discussions. Technically, the agent exposes a browser tool suite for DOM interaction, selector generation, shadow-DOM/iframe handling, state detection, retry/fallback logic and accessibility-aware selectors to tackle complex single-page apps (SPAs). The repo includes developer workflows (Node.js v16+, npm, Chrome, OpenAI API key), build/load instructions and a standalone test-extension for tool-level function-call simulation. The announcement highlights important trade-offs and implications: client-side execution promises stronger privacy but current API integrations suggest hybrid modes that could expose data; SPA robustness remains an open engineering challenge that the team invites the community to help solve via contributions, test cases, and framework-specific tooling.