I've used Malwarebytes for years, and never had a problem. Today, it blocked literally every website I had open, and then closed them all when I removed the extension. I usually keep a lot of tabs open for research, and now I'm going to have to look up hundreds of items from scratch.

Depuis la dernière version 3.3.6 "Réputation des résultats de recherche" bug ( sa reste active, mais les recherches reste noir) même chez Edge, au moins avant, sa buggais mais sa marchais, quand on activais sur Firefox. Maintenant c'est pire.
c'est pas sérieux.
Vous testez avant de le sortir?!! ou y' a plus humain chez vous...

Nice intention but too many websites just don't work properly when activated. Especially the Ad/Tracker Blocker practically disables browsing.

Mate, no other add-on stuffs up as much as this one. Today 50 of me tabs got blocked; I could only remember about ten off the top of me head – the rest are gone for good. That’s why I’m chuckin’ it today; the risk’s way too high. A couple of times a year somethin’ goes pear-shaped, so I gotta switch the add-on off. I’ve had a bloody gutful now!

yep nice .. every single website was blocked on my tab. I googled to look how to unblock everything with one click and did everything, even checked for database updates and nothing worked ... everything is still blocked .. had to manually unblock everything .. thank you very much for this work. Something that blocks everything out of the blue is the last thing someone wants.

Was great until it decided to block every single one of my tabs. What's wrong with reddit and google searches? And it didn't just block them, 80% of them couldn't be rewound so I lost most of my groups. Seriously, quality check your updates for crying out loud.

The latest version of 3.3.6 is a mess. It blocked every single tab I had, even the pinned ones. The version was last updated Sept 30, 2026 (today is Oct 1st). It was working all day and then out of the blue it blocked every single tab. What a mess.

The latest update blocks the Malwarebytes website itself as unsafe. When someone shows you who they are, believe them.

Roll back the update. I don't know what idiot authorized this latest update but it's completely broken web browsing. Github wont load the landing page properly and it's just a bunch of text on the left side of the screen and several websites I frequent are being blocked now as "scam" sites, when they arent. In fact I can't get "scammed" anyways because I have an ad-blocker. Roll it back, undo this disaster.

Edit: Disabling the plugin until this is fixed.

Literally blocked my connection to Youtube, Twitch and other obvious not-malware websites just because.

Absolutely trash. Addon decided everything was malicious and crashed the browser causing every tab and tab group to be lost.
Thanks. Maybe QA your updates next time

From one minute to the next, blocked every single page that the addon itself allowed previously. Only allows going on Google, surprisingly. Can only go on websites by disabling the addon. Hopefully it gets fixed quickly.

Stopped working today blocking every page becoming unusable

Out of nowhere started blocking literally every page I tried to open on the basis of "risky patterns". Now completely unuseable.

latest updates re-enables optional options by itself, seems to be gathering data. Trash.

Since it runs in the background, I really don't know what it's doing. But on more than one occasion it has blocked potential malware. It has popped up a notification on the screen advising not to go to that link. It does exactly what I want it to do.

I know that the company Malwarebytes has been around for quite some time and that the company name is a play on words. What I am going to say that the product(s) this company produces,as a whole, "BITES!!" I am running Windows 10-Pro 64-bit. From the website filehippo.com. I downloaded the trial of their software. Well, that was quickly uninstalled when it was detecting regular software as PUPs and putting them into quarantine. Not only that it was causing my PC to become unstable. After doing a total uninstall and removing any leftovers in the Registry, my PC returned to normal This is when I found their browser extension. After the extension started causing Firefox to become as steady as a one-legged man walking a tightrope, I understood why there is a warning at the top of the download page that reads as follows. "This add-on is not actively monitored for security by Mozilla." I was getting errors that I NEVER received prior to installing the extension. This extension stopped me from accessing my GMAIL, eBay, Amazon, and Walmart accounts on more than one occasion. While surfing those sites, I will get the pop-up window stating that the website could be harmful. Webpages would not fully load, or if they did load, it was only the text and not the interactive HTML. Lastly, it would make the browser act like it was running at dial-up speeds. Well, guess what. Just like with my installing the software for my PC, uninstalling the extension from my Firefox browser, it returned it to normal. There are other products out there that do the same thing, if not better and will not give you migraines while using them.