ProcrastiScan is a browser extension (Firefox, Chrome, Edge, Opera) that monitors the content of your open tabs (and optionally all running programs) and rates each one with a **Relevance Score** based on semantic similarity to user‑defined “relevant” and “distracting” keywords for the current task. When the averaged **Focus Score** drops below 0.5, the tool triggers an intervention—such as automatic tab blocking, saving tabs to a “procrastination list,” a red‑warning toolbar theme, or an experimental AI chatbot—to help the user stay on track. It is aimed at anyone who wants a lightweight, privacy‑preserving assistant for reducing online distraction and improving productivity.