Co-Op

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Co-Op is a Chrome extension for real-time co-browsing with genuine remote control.The host shares a browser tab as a peer-to-peer video stream. The guest watches it live and can take control - moving the cursor, clicking, scrolling and typing on the host's machine. Control is injected as trusted input via the Chrome debugger protocol, so the page cannot tell it is remote: it works on banking portals, canvas apps, paywalled pages and everywhere else that normal automation and screen-share tools fail.The architecture is pure peer-to-peer. The server handles signalling only and then exits the data path, so video never touches your infrastructure and bandwidth costs do not scale with usage. That is the moat.What's included:- Chrome MV3 extension (vanilla JS, no build step) - popup session UI, offscreen WebRTC, host-side control injection, guest viewer and overlay- Node + Express + Socket.io signalling server with Redis-backed rooms and MV3-resilient rejoin- Full documentation: architecture, setup, testing, and a living decision log- VPS deployment setup (PM2, Nginx, Let's Encrypt)Built with: vanilla JavaScript (ES modules, JSDoc types), Chrome MV3 + Offscreen Document, chrome.tabCapture, chrome.debugger (CDP input dispatch), simple-peer / WebRTC, Node.js, Express, Socket.io, Redis, PM2, Nginx.Current state: working end to end - the host shares, the guest sees the screen and controls it, with host-overrides-guest authority and pause/resume. Visible remote cursors and a redesigned popup are done. Honest list of what is left: click alignment drifts at the edges on non-16:9 windows, ICE restart needs verifying on a real network switch, and accounts/billing are stubbed rather than built (Google Sign-In and Lemon Squeezy were the plan).Sold as-is: full source and documentation. Pre-revenue, no users or infrastructure to transfer.