How to Use BrowserScan with Mozilla VPN: A Leak-Proof Workflow
How to Use BrowserScan with Mozilla VPN: A Leak-Proof Workflow
You’ve secured your connection with Mozilla VPN, but do you truly know your IP address is hidden? A VPN can silently spring leaks—exposing your real IP, DNS queries, or WebRTC data. BrowserScan, a free suite of privacy tests, helps you verify that Mozilla VPN is actually protecting you. In this guide, you’ll learn a step-by-step workflow to combine both tools and cure any leaks before they compromise your privacy.
Why Pair BrowserScan with Mozilla VPN?
How to Use BrowserScan with Mozilla VPN: A Leak-Proof Workflow product interface and feature overview.
Mozilla VPN encrypts all device traffic, masks your IP, and routes data through over 500 servers in 30+ countries. It’s a full-device VPN, meaning every app on your device benefits—not just your browser. But even the best VPNs can struggle with configuration mishaps, DNS leaks, or WebRTC exposures that reveal your real location. That’s where BrowserScan comes in.
BrowserScan is an online privacy toolkit that instantly checks for:
- IP leaks (showing your real IP and geolocation)
- DNS leaks (exposing which servers resolve your queries)
- WebRTC leaks (revealing local and public IPs via STUN requests)
- Browser fingerprint uniqueness (the many subtle ways sites can identify you)
When you use BrowserScan while Mozilla VPN is active, you get transparent proof that your entire privacy stack is leak-free. If something’s off, you can fix it before prying eyes notice. We’ve reviewed how Mozilla VPN performs in detail, and this auditor pairing consistently surfaces hidden issues that other checkers miss.
Before You Begin: Set Up Mozilla VPN
How to Use BrowserScan with Mozilla VPN: A Leak-Proof Workflow product interface and feature overview.
Install and Connect Mozilla VPN
First, make sure Mozilla VPN is installed and running:
- Head to the Mozilla VPN official site and download the app for your device (Windows, macOS, Linux, Android, or iOS).
- Sign in with your Mozilla account and start your subscription (or activate a trial).
- Open the app, select a server location from the list, and tap Connect.
- Optional: enable Multi-hop if you want to route traffic through two servers for extra obfuscation.
Once connected, the app’s icon will show an active VPN status. You’re now ready to run the privacy audit.
Verify Connection Basics
Before diving into leak tests, confirm that your IP has changed at a basic level. You could visit any “What’s my IP” site, but BrowserScan’s own IP lookup will give you richer data. With Mozilla VPN on, open BrowserScan IP Lookup. The displayed IP and location should match the VPN server you selected—not your home ISP. If it still shows your real IP, you have an immediate IP leak (possibly caused by a kill-switch failure or split-tunneling misconfiguration).
Step-by-Step: Auditing Mozilla VPN with BrowserScan
How to Use BrowserScan with Mozilla VPN: A Leak-Proof Workflow product interface and feature overview.
Now for the real check. Run through these tests in order while Mozilla VPN stays connected. Each step uses a dedicated BrowserScan tool.
1. Check Your IP Address and Geolocation
Head to BrowserScan’s IP Lookup. With the VPN active, note:
- The public IP shown.
- The geolocation city, region, and country.
- The ISP name (should be Mozilla’s VPN infrastructure, such as Mullvad or a partner server).
BrowserScan pulls data from multiple IP intelligence sources (ip-api, IPinfo, IP2Location, db-ip, and IPQuery), so you can cross-verify the result. If any source reveals your real IP, that’s a leak. Swap servers, toggle the VPN off and on, or check your app’s kill-switch settings, then try again.
2. Run a DNS Leak Test
DNS requests can sometimes bypass the VPN tunnel, exposing your ISP’s DNS servers. Open BrowserScan’s DNS Leak Test. The page queries a set of test domains and lists every DNS resolver that answered. All IPs should belong to Mozilla VPN’s DNS infrastructure (often Cloudflare or Mozilla-owned servers). If you see servers associated with your home ISP, you have a DNS leak.
Fix: Inside Mozilla VPN’s settings, enable Secure DNS (DNS-over-HTTPS). This forces all DNS traffic through the VPN tunnel. Also, flush your DNS cache after making changes (ipconfig /flushdns on Windows, sudo dscacheutil -flushcache on macOS). Rerun the test until only clean results appear.
3. Test for WebRTC Leaks
WebRTC can leak your local (internal) IP address and sometimes the public IP, even when a VPN is active. Go to BrowserScan’s WebRTC Leak Test. It shows both your public IP and local IP (usually beginning with 192.168. or 10.).
- The public IP must match your Mozilla VPN server IP. If it shows your home IP, you have a severe WebRTC leak.
- The local IP is less critical but can be used for local network fingerprinting.
BrowserScan uses multiple STUN servers for a thorough check. If a public IP leak appears, disable WebRTC entirely in your browser:
- In Firefox, open
about:config, search formedia.peerconnection.enabled, and toggle it tofalse. - In Chrome, install a trusted WebRTC-disabling extension or use the
--force-fieldtrials=WebRTC-...command line flag.
Re-run the BrowserScan test to confirm the leak is sealed.
4. Inspect Your Browser Fingerprint
Hidden IP addresses don’t make you anonymous. Your browser fingerprint—a combination of screen size, fonts, OS, extensions, canvas hash, and more—can still uniquely identify you. While Mozilla VPN changes the IP-related signals, dozens of other attributes stay constant.
Run BrowserScan’s Fingerprint Check. It assigns a uniqueness score and highlights every detected parameter. Even with the VPN on, you may see a high uniqueness rating because of uncommon settings. Use this information to harden your browser:
- Enable Firefox’s resistFingerprinting mode in
about:config. - Install privacy extensions like Canvas Blocker.
- Stick to a common screen resolution and default system fonts.
For a second opinion on your fingerprint depth, compare results with a dedicated audit tool—our BrowserLeaks review contrasts its approach with BrowserScan’s detection. A thorough fingerprint audit ensures your Mozilla VPN isn’t rendered useless by browser-side tracking.
What to Do If BrowserScan Finds a Leak
How to Use BrowserScan with Mozilla VPN: A Leak-Proof Workflow - supporting product research image 4.
Even with Mozilla VPN active, leaks can happen due to outdated clients, browser extensions, or OS-level DNS settings. Here’s a quick fix table:
- IP leak → Reconnect, switch to a different server, ensure kill-switch is on. If using split-tunneling, verify that the browser isn’t excluded from the VPN.
- DNS leak → Enable Secure DNS in Mozilla VPN app, then flush DNS cache. Bind your OS DNS settings to the VPN adapter (advanced users only).
- WebRTC leak → Disable WebRTC in your browser, or use an extension that forces WebRTC through the VPN interface.
- High fingerprint uniqueness → Adjust browser privacy settings, remove rare extensions, and consider a dedicated anti-detect browser for use cases that require strict anonymity.
After applying fixes, repeat the full BrowserScan audit to confirm everything is clean.
Practical Workflow Examples
Everyday public Wi-Fi user: Jane connects to a coffee shop network and enables Mozilla VPN (US server). She opens BrowserScan’s IP lookup—IP shows New York, not her local city. DNS leak test shows only Cloudflare resolvers. WebRTC reveals no public IP. Fingerprint score is high due to her custom Firefox theme, but she keeps it because her real IP is hidden. She knows her setup is solid.
Suspecting an ISP DNS leak: Tom notices slower browsing after a software update. He runs BrowserScan’s DNS leak test and spots his ISP’s DNS servers in the list. He turns on Mozilla VPN’s Secure DNS, flushes the cache, and retests—now only Cloudflare servers appear. BrowserScan gave him the diagnosis in under two minutes.
These real-world scenarios show how the combination acts as a continuous health check for your privacy.
Related reading
- Chameleon Mode Review: Real Anti-Detect Browser for Marketers? - Is Chameleon Mode the best antidetect browser for affiliate marketers and agencies? Read our evidence-based review covering features, pricing, and account ban reduction.
- Top 10 Online Vulnerability Scanning & Network Security Tools 2026 - Discover the best online vulnerability scanning tools for 2026. Compare Qualys, Tenable, HackerTarget & others, see criteria, and learn how to choose.
Sources and further reading
- Client Challenge - A required part of this site couldn’t load. This may be due to a browser extension, network issues, or browser settings. Please check your connection, disable any ad blockers, or try using a different browser.
- Browser With Built-In VPN: Secure Browsing - Gain more control over how your browsing activity is seen online with Firefox — a browser that comes with a built-in VPN.
- How To Use VPN In Mozilla Firefox [2026 Guide] - Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
Frequently Asked Questions
Can I use BrowserScan with Mozilla VPN on mobile?
Yes. Open any mobile browser and navigate to the BrowserScan tools just as you would on desktop. The leak tests function identically; mobile browsers can still leak DNS traffic or expose a local IP via WebRTC. For thorough checks, test while the VPN is active on both Wi‑Fi and cellular connections.
Why is my browser fingerprint still unique even with Mozilla VPN?
A VPN only changes your IP and network route. Browser fingerprinting collects dozens of other data points (screen dimensions, timezone, GPU model, installed fonts) that are untouched by the VPN. BrowserScan makes these vectors visible so you can systematically reduce your uniqueness.
Does Mozilla VPN protect against all WebRTC leaks?
It prevents your public IP from leaking because all traffic, including WebRTC, goes through the VPN tunnel. However, your local IP (e.g., 192.168..) can still be exposed—this is inherent to the protocol. For full protection, disable WebRTC in your browser or use a browser extension that blocks it.
How often should I run a BrowserScan check?
Run a check every time you connect to a new network (cafés, airports), after a major OS or browser update, or whenever you suspect a leak. A monthly full audit (IP, DNS, WebRTC, fingerprint) helps ensure no subtle drift has introduced new vulnerabilities.
Conclusion
Mozilla VPN gives you device‑wide encryption and a strong privacy backbone, but only a leak test like BrowserScan confirms there are no cracks. By combining BrowserScan’s IP lookup, DNS leak test, WebRTC leak test, and fingerprint checker in a single workflow, you turn guesswork into certainty. At BrowserScan, we’ve tested this pairing across multiple environments and found it to be the quickest way to catch and fix configuration weaknesses before they matter. For a deeper look at Mozilla VPN’s overall performance, read our full Mozilla VPN review. And when you’re ready to expand your audit to include network‑layer scans, explore how to use BrowserScan with Nmap for even more robust privacy assurance.