Works well for blocking spam and I've gotten a few warnings about certain sites. Some first time going and some I know to be legitimate, but that's how security goes. Still lets me go if I acknowledge the warning of course. The main issue is that some, though few, websites have loading issues. Mine specifically is my microsoft email through outlook/live.com When I go there I can't interact with much for a good 20 to 30 seconds. I've tried disabling the ad, spam and malware protections specifically for outlook/live.com email website and also disabling global protection of those features, but it still does the same. I specifically have to disable the "All protections" setting. So it seems like its still actively doing something even when i globally disable the 3 protections for all sites and only stops if I tick the option to disable all protections. I don't really care about that specifically, but just noting that seems to be why outlook/live email performance in the browser goes back to normally after disabling it. While I like the ad block feature enormously since it actually works, I don't want to disable the whole thing everytime i need to check my email so I'll just leave it off for now and circle back to it in a month or so to see if this issue is resolved with some kind of update. Been putting up with it for well over a year so its not a new thing. I just didn't think to leave a review about it until now. I would submit a report/ticket to malwares help center directly but it requires making an account and I just don't want yet another account. Hopefully they see this when checking reviews.

Edit: Actually it effects my google emails as well, just less so since the delay is one or two seconds I didn't notice as much though now that its instant its very noticable. The outlook one is basically instant when its disabled too just not as fast as google's email, but compared to the almost 30 second load time prior the difference is wild.

Edit2: March 30, 2025
I've updated to the 3.0.14 version and the huge delay in outlook email is gone! Bumping review to 5 stars since this removes the main issue I had with it.

Edit3: April 10, 2025
Updated to version 3.0.17 and a several seconds delay is happening now. Its a little better when I tell it to disable all protections for everything, but if I turn it off for only outlook then there is no difference so its still doing something again. If I disable the extention altogether then its based to instant speeds. Not sure what happened between the updates but its unfortunate. I'll try to install the 3.0.14 version and try to keep it from auto updating. Its also possible this is a firefox thing since it updates as well. So I'm not gonna just blame malwarebytes outright on this one.

Great experience as always. But as it's app version, it eats to much memory. Wish some day your creation won't even bother a low-end devices

🌕SUKHEN GAUTAM FAMILY SHAEE PUSHTAINI SARKAAR PIDIYAAN PARIVAAR.

Perfeita para segurança total junto com antivírus. Superou expectativas em minhas máquinas não alterou nada em desempenho do sistema e de softwares.

I don't worry when Malwarebytes is on.

Works great! It has blocked websites that i didn't even know was malicious or a scam! I recommend this to everyone!

works perfect en is easily installed!

SEP 21, 2025:
I've reinstalled Malwarebytes Browser Guard and the improvement is undeniable; it works great now.

It would be helpful if Firefox made updates more visible, since it’s not always clear when a new version is available. Still, it’s good to see the extension running smoothly.

Thanks, Malwarebytes! I also hope you release a mobile version someday; that would be fantastic.

Old review:
(I've been using "Malwarebytes Browser Guard" for a couple of months, and I've noticed a few issues.

There's no doubt it does a great job blocking malicious sites, trackers, scams, etc. But it also slows down the browser when I have several tabs open or when loading more than one tab at the same time. After testing, I noticed a pattern (at least in my case): the more images a website has (Google Maps, ArtStation, Pinterest, etc.), the worse the browser's performance gets. So, I went into the extension's settings and disabled its three main features (Ads/Trackers = Off, Malware = Off, Scams = Off) for each of these sites, but to my surprise, it didn't work—the sites were still slow. I assume that Malwarebytes is still scanning all the links on the site, but the fact that this happens even after disabling those features feels like a big flaw. Hopefully, it's just me not knowing how to use the extension properly, but for now, I had to disable it.

At first, I thought the issue was related to my browser's cache or something similar, so I reset the browser, and that fixed it temporarily. However, once I reinstalled my extensions, the issue came back. After testing them one by one, I found out that the problem was caused by "Malwarebytes Browser Guard."

This wouldn't be such a big deal, but I use the aforementioned pages a lot and at least I think that many users also use Google Maps and from my experience, that's where the issue is the worst.)