ExtGuard: A lightweight, zero-footprint browser extension that acts as a 'man-in-the-middle' for other extensions, inspecting all outbound API calls for PII/PCI data and blocking unauthorized domains without slowing down user workflow.

Mid-market companies (50-500 employees) using SaaS tools (Slack, Salesforce, Gmail) via browser extensions face silent data exfiltration. Current EDR (Endpoint Detection and Response) tools do not monitor browser extension network traffic at the DOM level, resulting in an average breach detection time of 21 days. IT teams lack visibility into third-party extension behavior.