This example shows a browser extension that automatically visits a queue of URLs and captures matching JSON responses from XHR and fetch requests. It displays real-time progress through the URL queue, tracking completed and pending items, active page loads, and downloaded file counts. The visualization updates every second using popup.js polling with chrome.runtime.sendMessage, while injected.js intercepts network calls before they reach the page and content.js forwards captured data to the background service worker, which saves each response as a JSON file.