Building a serverless Chrome Extension to safely extract Facebook Group data

Building a serverless Chrome Extension to safely extract Facebook Group data Hey everyone! 👋 As a solo freelance developer who handles a lot of web automation, data scraping, and B2B lead generation, I constantly need to analyze Facebook communities. Usually, when I need to scrape data, my default stack involves spinning up Python with Playwright, Nodriver, or handling anti-detect browsers. But let’s be honest: maintaining a heavy automated setup just to grab a quick list of members from a few Facebook groups is massive overkill. Plus, Facebook’s DOM changes frequently, and their rate limits are notoriously strict. I needed something lightweight, fast, and most importantly—something that runs directly in the browser's context without any external API keys or third-party servers. So, I built FB Extractor to scratch my own itch. It turns Facebook™ group data into a clean spreadsheet in just one click. The Technical Approach I decided to build this entirely as a Manifest V3 Chrome Extension. The core philosophy was zero backend. Extraction runs entirely in your browser, and the collected groups and members are stored on your own device. Here were the main challenges and how I handled them: 1. Mimicking Human Behavior to Avoid Bans Automated data collection can easily trigger account restrictions. To mitigate this, I avoided instantly dumping the DOM. Instead, I implemented a customizable Request Interval (1–20 seconds). I also added an Optional Random Scroll feature, which makes the collection behave much more like ordinary human browsing. Here is a simplified version of the logic I use to humanize the scrolling and request delays: // A simple helper to simulate human-like delays const sleep = (min, max) => { const ms = Math.floor(Math.random() * (max - min + 1)) + min; return new Promise(resolve => setTimeout(resolve, ms)); }; // Logic to randomly scroll the page before extracting the next node async function humanScroll() { const scrollStep = Math.floor(Math.random() * 300) + 100; // Scroll 100-400px window.scrollBy({ top: scrollStep, left: 0, behavior: 'smooth' }); // Wait between 1 to 20 seconds based on user settings await sleep(1000, 20000); } 2. Handling Complex DOM and Data Structuring The extension parses the feed and structures the data on the fly. You can export a group's members (everyone visible in any group you have access to) or your group list (every group you belong to, with name, ID, and URL). Everything is then packed into a Blob and downloaded instantly as CSV or XLSX, ready for Excel or a CRM. Privacy by Design Because this involves social media data, privacy is a huge concern. I made a strict architectural decision: Contact details are not collected. There is no email, phone, website, or messenger column, by design. It only grabs public UI identifiers (like user ID, name, verified status, and profile picture). The extension never sends your data to any servers; it only talks to fbextractor.com to check the license tier. The Result It’s been saving me hours of manual copy-pasting, so I polished the UI (adding support for 7 languages) and published it. I’ve made a Free tier that is actually useful for daily tasks: it allows exporting up to 50 groups per run and up to 200 members per group, complete with full CSV/XLSX export and the Random Scroll feature. (There is also a Pro version for unlimited extraction). If you work with lead gen, e-marketing, or just love dissecting Chrome extensions, I’d be thrilled if you tried it out! 🔗 Chrome Web Store: https://chromewebstore.google.com/detail/fb-extractor/nlchcmccgileneicfgpeeljlojiolhob 🔗 Website: https://fbextractor.com I'd love to hear your feedback on the code approach. What is your preferred stack when you need to automate simple browser tasks without waking up the heavy Python scripts? Let me know in the comments!