This add-on is pretty good and helps prevent malware from being downloaded, as well as helps to avoid unsafe websites. However, today it started causing a massive memory leak whenever I opened my browser. My memory utilisation goes from about 40% with the add-on off to staying at 100% with the add-on active and websites will barely load. Hopefully this is fixed soon and I can re-enable the add-on.

Browser performance (with many tabs) suffers terribly if both Malware and Scams are switched on in addition to Ads/Trackers. For Malware, and for Scams, global switches are terribly broken: after switching off globally at one tab, I find both features wrongly switched on globally at another tab. I'll gather debug logs and discuss in the forums.

Also, the release notes here at AMO are wildly inconsistent with the release notes at the Malwarebytes website.

ad-block turns on by itself even when switched off in global settings. very annoying

Расширение интересное, но до конца не оптимизированное. Есть расширение получше. Возможно много памяти браузера занимает, мной не проверено, но потом как будет время, может, посмотрю.
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The extension is interesting, but not fully optimized. There is a better extension. It probably takes up a lot of browser memory, I haven't checked it, but then I'll take a look at the time.

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.

Hello, my name are Diego from Italy. I have windows 10 professional 64bit.

I receive reply of support of Malwarebytes Brower Guard, they write me i save in my email to tell for you for my segnalation, because your Mozilla Firefox must approvate the final version build are now 3.0.14 addons for mozilla name exacly Malwarebytes Browser Guard because are much later you have i look build 2.6.27 because you must approvate in your browser mozilla the final now version build are now 3.0.14.

The support of malwarebytes they write me this exacly this they want i tell you this to send you :

William (Support)

Hi Diego,
Thanks for contacting Malwarebytes Customer Support!

My name is William and I will help you with ticket #4734637.
The Firefox extension and the Chrome extension need to be approved by different companies.
Firefox ix is ​​sometimes very slow in approving new versions
Since Firefox is slow in approving new versions, there may be times when the versions between Firefox and Chrome will be different
Please be assured that as soon as Firefox approves the new version, it will be updated to the latest version
This is not a Malwarebytes issue, it is a Firefox issue.


my final Firefox version build are now 136.0.1 (64 bit) and Versione di Malwarebytes Browser Guard 2.6.27 are only update 11 Jun 2024.

So I really kindly ask you, so to approve their latest build version 3.0.14 that they released this March 2025 that has already been released for chrome and for Edge so you are the only one missing to approve their latest build of March 2025.

At this point I really kindly await your response to my request.
Best regards
Diego from Italy exacly in my region Sicily

Lacks real support, instructions for an ALLOW LIST tell me where to look, but it's not there.

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

It's a good extension for blocking trackers and security reasons, but it eats up too many resources and makes websites slower to load.