Every time I closed Firefox it showed me a message that it had not closed properly, I had to uninstall Malwarebytes extension and the problem was solved.
It also does not work very well against advertising and pop-ups

good extension but I had conflicts issues with Mullvad VPN check status site if I use it in combination with the "disable webRTC" add-on:

https://am.i.mullvad.net/

it lost time for Checking for WebRTC leaks and then it shown "Failed checking for WebRTC leaks."

https://mullvad.net/en/guides/webrtc/

https://addons.mozilla.org/en-US/firefox/addon/happy-bonobo-disable-webrtc/

User of Malwarebytes Premium, I'm not sure if this add-on is redundant but, hey! let's try!
I use Ublock0 + Umatrix and on some pages Malwarebytes seems to block things that are not blocked by those two tools. It would be a very good thing to add the possibility to see details of blocked resources.

EDIT: some false positives. Pages add-on detect as suspicious/malwares but are totally legit. The desktop application don't detect them and a search on virustotal give "all good" result. There is work to be done on the detection engine.

As a premium user of the desktop app I'm gonna stop using the Firefox add-on. Some measure of protection are already taken and I'm not interested in the functionality like "clickbait prevention" as long as I'm not a stupid user and know to use self judgement. Still in my collection, I will keep an eye on it.

However I think it could be a good add-on if you are not premium user of the desktop application.

Keep up the good work.

Working as expected.
Thank you Malwarebytes!

I am a premium MB user for 4 or 5 years. The extension is the best and I have it from the first moment that came out in beta.
Will this extension be paid? And for those who are already premium ?.
Thanks for your great work.

Идея хорошая. Пилите дальше т.к пока многие сайты ломает.

The new version 1.0.16 just released ROCKS!

Блокирует RT с категорией "scam category". И выдает сообщения о кликбайтах на сайте. Просто полный набор.

es la mejor extension de segurida de todas.

goooooooooood

Useless extension Does nothing.. i had by mistake gone on some malicious links.. have received warning from my AV , avira browser extension, even nowadays from bit defender traffic light, but never from this extension its sleeping..

I've always used Malwarebytes.. It's NICE!!

Since problems were corrected about 1 month ago Malwarebytes along with ADWCleaner, a Malwarebytes program, have given me quick effective service. I also use Norton but so far, MBAM has taken care f me, not leaving anything for Norton to catch that was missed by MBAM.

Perhaps the best malware program available

Seems fine to me.
I think this will be a great add-on to Firefox.