Mettl Secure Browser: What MSB Blocks, How to Set It Up, and How to Avoid Getting Flagged

You got the invitation email, clicked the link, and instead of a normal test page you're staring at a download prompt for something called Mettl Secure Browser. That's the moment most candidates start googling. Don't panic. MSB is simply the lockdown app Mercer Mettl uses when an employer wants a proctored assessment with the tightest possible controls. It isn't malware, it isn't optional, and it isn't as scary as it looks once you know what it does.

Here's the short version. Mettl Secure Browser runs on Windows or macOS, closes every other application on your machine, and asks for camera, microphone, and screen-monitoring permissions before the test opens. It needs a steady connection of roughly 1 Mbps. You never launch it by hand; it starts itself from the test link. Everything else in this guide expands on those five facts, because each one has a way of tripping people up on test day.

We'll walk through installation, the permissions screens on both operating systems, what happens if your internet drops, and the anti-cheating layer Mercer added in late 2025. Then we'll get practical. The candidates who struggle with MSB usually struggle for boring reasons: a second monitor, a Zoom window still open, a laptop battery at 12%. If you want to spend your energy on the actual questions instead, start with mettl test practice free so the format feels familiar before the software does.

What Mettl Secure Browser Actually Is

Mercer Mettl offers employers several proctoring levels. At the lightest end, a test runs in your normal browser with the webcam on and an AI watching for a second face or a wandering gaze. One step up, a human proctor watches the live feed. At the strictest end sits Mettl Secure Browser, usually shortened to MSB. It's a standalone desktop application that takes over the whole screen and shuts the door on everything else your computer can do. Wondering does mettl use camera? With MSB the answer is always yes, plus the microphone.

The reason employers reach for MSB is control. A browser tab can be minimized, a second tab can hold ChatGPT, and a phone can sit just out of camera view. MSB closes the running applications it finds, blocks new ones from opening, and watches background processes for the duration of the test.

Companies hiring at scale, especially for technical and finance roles, tend to require it because a single leaked answer key can invalidate an entire recruiting round. If you're still figuring out what is mercer mettl and why so many employers use it, the short answer is that the platform bundles the assessment and the proctoring into one system.

One detail matters more than any other: you don't install MSB the way you'd install a game and then double-click it later. The download is triggered by your unique test link, and the app launches itself from that same link. Opening it manually gets you a blank window or an error. Mettl's own knowledge base is explicit about this (source), and it's the single most common source of "the test won't start" support tickets.

System Requirements Before You Download Anything

MSB is picky about hardware in ways a normal browser test isn't. You need a desktop or laptop running Windows or macOS with a working webcam and microphone. Phones and tablets are out, full stop.

Mettl's support documentation lists Chrome 63 or newer, Firefox 52 or newer, or Safari 12 or newer for the browser-based proctored tests, with an upload speed of at least 512 kbps (source). For MSB itself the bar rises to a steady 1 Mbps, and "steady" is the operative word. A connection that spikes to 50 Mbps and then stalls for ten seconds will cause more trouble than a boring, consistent 3 Mbps line.

Edge is not supported for proctored tests, which surprises a lot of Windows users who never installed anything else. Download Chrome before test day if that's you. Also check your camera works outside of Mettl. Open the built-in camera app, confirm you can see yourself, and confirm the microphone meter moves when you talk. MSB will ask for those permissions, but it can't grant them for you, and a camera that's been disabled in privacy settings will block the test from starting.

A quick reality check helps here. Ask yourself whether the machine you're using is really yours to lock down. Corporate laptops often have endpoint security that fights MSB, and some IT policies block the installer entirely. If you have any choice, use a personal computer. To test your mettle under realistic conditions, run a timed mettl sample test on the same machine you'll use for the real thing, so you learn how it behaves before anything is riding on it.

Disconnections, Refreshes, and the 30-Minute Resume Rule

This is the section to read twice. Mettl's platform saves your progress from the last sync, and if your internet or power drops you can resume within 30 minutes using the same email address (source). Your answered questions and remaining time are preserved. That's the good news. The catch is that employers set a total "disconnection duration" allowance for the whole test, and once you've burned through it, the next drop ends the assessment for good. You won't be told the exact allowance in advance, so treat every disconnection as if it might be the last one you're permitted.

The second rule is brutal and non-negotiable: pressing F5 or refreshing the page submits the test immediately. Inside MSB there's no browser toolbar to tempt you, but keyboard muscle memory is real, and candidates who habitually refresh when a page looks slow have submitted half-finished tests this way. If the screen seems frozen, wait. Count to twenty. A slow question load is almost always the platform syncing, not a crash. Building that patience is part of why we recommend working through timed mettl test questions before the real sitting.

Rescheduling is the other thing people get wrong. You can't reschedule a Mettl assessment yourself. The recruiter or test administrator does it inside the platform, and Mettl directs candidates with link or timing problems back to the organization that sent the invitation. So if your power company has scheduled an outage during your window, email the recruiter now, not after the fact. Meanwhile, get comfortable with the range of mettl questions employers pull from, because a calm candidate handles a technical hiccup far better than a rattled one.

The Anti-Cheating Layer: What Changed in Late 2025

On November 10, 2025, Mercer Mettl announced a set of Mettl Secure Browser defenses aimed squarely at generative-AI helpers (source). Three pieces matter to candidates. First, overlay blocking: tools that draw a transparent answer window on top of your screen, the kind marketed as "invisible" interview assistants, are detected and blocked. Second, a global library of known cheating applications that MSB checks against. Third, background process monitoring, which watches what's running rather than just what's visible. Voice-input helpers were named explicitly.

For coding assessments there's an additional wrinkle. Mettl's coding platform reports an "AI Sense" score that estimates whether submitted code was generated by a model rather than typed by a human. Employers see that score next to your solution. It doesn't automatically fail you, but a high score on an otherwise clean submission will prompt questions in the interview that follows. The practical takeaway for anyone preparing for a mettl coding test is simple: write the code yourself in practice, in your own style, so the real submission looks like the rest of your work.

Mercer states that its AI proctoring detects cheating with 95% accuracy. Whatever you think of that number, it means the system also produces some false flags, and those get reviewed by humans afterward. Innocent behavior that resembles cheating, like reading a question aloud, glancing repeatedly at a notepad beside the keyboard, or having a family member walk behind you, can end up on that review pile. Keep the room empty and your eyes on the screen. If you want to see the style of problems the coding round uses, work through mettl test coding questions in a timed sitting first.

Preparing Your Room, Your Machine, and Yourself

Start with the room. You want a plain background, a closed door, and light in front of you rather than behind you, because a backlit face is one of the easiest ways to trigger a "face not detected" flag. Clear the desk of paper, phones, and second devices. If the employer allows rough paper, they'll say so in the instructions; if they don't say so, assume it's not allowed. Put the phone in another room entirely. A notification buzz on the desk shows up on the microphone feed, and a glance at it shows up on camera.

Next, the machine. Plug the laptop into power. Disconnect any external monitor, because MSB expects a single display and extra screens are a classic launch blocker. Close every application, sign out of chat clients rather than just minimizing them, and pause cloud backups that eat upload bandwidth. If you use Wi-Fi, sit within sight of the router or run a cable. Restart the computer thirty minutes before the slot so nothing is hanging around in memory. Then open the invitation email and wait for the scheduled time.

Finally, yourself. The software is a hurdle, but the questions are the test. Employers building a Mettl assessment usually combine an aptitude section with a role-specific one, and time pressure is the real differentiator. Working through structured mettl practice questions in the weeks beforehand does more for your score than any amount of fiddling with settings the night before. If numbers are your weak spot, give mettl quantitative test questions a dedicated session or two, because the quantitative block is where most candidates lose time they never recover.

Common Mistakes That Get Candidates Flagged or Locked Out

The first mistake is launching MSB from the desktop icon. It opens, shows nothing useful, and the candidate concludes the software is broken. It isn't; it just has no session to load. The fix is always the same: close it, go back to the email, click the test link. The second mistake is granting permissions halfway. Windows users approve the camera and deny the microphone, or Mac users approve both and skip Screen Recording. MSB then refuses to start, and the error message isn't especially helpful about which permission is missing.

The third mistake is subtler. Candidates read the question out loud under their breath, a habit many people have when concentrating. On a proctored test that's audio of a voice during the assessment, which is exactly what the analytics flag. Practice reading silently. Similarly, looking down at your hands on the keyboard is fine, but looking off to the side repeatedly reads as glancing at notes. If you're taking a mettl psychometric test or another personality-style section, there's no reason to look anywhere but the screen, so make that your default posture for the whole sitting.

The fourth mistake is running the test on a machine you don't control. Company-issued laptops with device management will sometimes kill MSB mid-test, which counts as a disconnection you didn't cause and can't prevent. Borrow a personal computer if you can. And the fifth mistake is simply arriving cold. The interface, the timer, and the question style all feel foreign the first time. A round of mettl logical reasoning questions under a timer takes that unfamiliarity off the table so the only new thing on test day is the software.

What Happens After You Submit

When you submit, MSB releases its grip on the machine and your other applications come back. The recording, the flags, and your answers go to the employer's dashboard, not to you. Most companies don't share proctoring reports with candidates, and Mettl itself sends candidates with result questions back to the hiring organization. If you had a disconnection, make a note of the time and what happened, and email the recruiter the same day. A clear, calm message about a known outage is far more persuasive than a vague one three days later.

Results depend entirely on how the employer set up the assessment. Some sections are scored automatically, like aptitude and coding, and those numbers are available to the recruiter almost immediately. Others, like open-ended writing or a case exercise, are reviewed by a person. Personality and behavioral sections don't have a pass mark at all; they produce a profile the employer compares against the role. Knowing what is mettl assessment in your specific case helps you interpret the silence that often follows submission, because "we'll be in touch" can mean anything from a day to a month.

If you didn't advance, ask for feedback anyway. Recruiters won't share the proctoring log, but many will tell you which section pulled the score down, and that's exactly the information you need for the next attempt. Most candidates face Mettl more than once across a job search, because so many large employers license the same platform. Treat this sitting as reconnaissance for the next one, and put the time into targeted practice rather than re-reading the instructions you've already mastered.

Resources, Support, and Where to Get Help

Mettl runs a public support portal with articles covering MSB installation, proctoring types, and resume scenarios; the links cited throughout this guide point there. Read the article that matches your operating system the night before rather than during the test. For anything about your specific link, schedule, or eligibility, the correct contact is the recruiter or test administrator who invited you, because Mettl support routes those questions back to the organization anyway. Save yourself a round trip and email the recruiter directly.

For preparation material, the employer's invitation sometimes includes a sample or demo test. Take it, even if it looks trivial, because it uses the same interface you'll see on the day. Beyond that, structured practice is the lever that actually moves your score. A printable set of mettl test questions and answers is handy if you like working on paper first, and timed online sets are better for building the pace the real assessment demands. Alternate between the two in the last week: paper for understanding, screen for speed.

One more thing about support. If the compatibility checker fails and you can't fix it, tell the recruiter before the slot, not after. Employers can reissue links, move you to a browser-based proctoring mode, or reschedule, but only if they know in time. Candidates who show up with a broken setup and no warning are the ones who end up with a "did not complete" next to their name, and that's the outcome every bit of preparation in this guide is designed to prevent.

Putting It All Together

Mettl Secure Browser is a locked room, not a trap. It closes your other apps, watches your camera and microphone, monitors the screen, and expects a steady connection. Every one of those behaviors is documented, and every one of them is manageable with an hour of preparation a day or two before the slot. Run the compatibility check, install from the link, grant all the permissions, unplug the second monitor, and restart the machine. That sequence handles the software side almost completely.

The rules that can't be undone deserve one last mention. Refresh submits. Disconnections are counted against a hidden allowance. Rescheduling goes through the recruiter. The late-2025 update means overlay tools and voice helpers are detected, and coding submissions carry an AI Sense score. None of that should worry a candidate who intends to do the work honestly; it just means the room is genuinely locked, so plan as if it is.

Then shift your attention to what the employer is actually measuring. The assessment behind the secure browser is a mix of aptitude, role knowledge, and behavior, delivered under time pressure. That's where practice pays. Pick the sections that match your invitation, work through them under a timer on the same machine you'll use for the real thing, and treat the software as a solved problem. When the download prompt appears on test day, you'll already know exactly what to do.