I'm running the latest version of FireFox. This has warned me about entering two or three potentially malicious sites, but I get multiple occurences daily of pages virtually freezing and a warning pop-up that the plugin is slowing FF down. I've therefore disabled it for now. When I next remember, I'll give it another try to see if the issue (if there is one) has been addressed.

Edit: VERY impressed by the speed of Malwarebytes' response! Have added a diary reminder to turn it back on in a week's time to see if the fix has been implemented. In the meantime, I'll try very hard not to visit sites I shouldn't. :-)

This extensions been good for quite some time now, but recently, due to the bug that's been slowing down my browser, it's starting to get unbearable, I upload content on YouTube and browse the internet, and constantly getting a popup from my browser that its being slown down for long periods of time every 5 - 10 minutes is pretty annoying.

Until this bug's fixed, I do not recommend this extension to anyone, despite how good its features are.

I used to enjoy this Add-on until recently. I am using Firefox, and lately I have been getting the error message that Malwarebytes Browser Guard is slowing down my browser and that I should consider removing it. Not good.

Decent App. but with latest update. Utterly Broken. causes Firefox to lag and slow down /freeze. Which it never did in the past.

All of sudden it keeps causing firefox to slow down to a stop when watching youtube, its always been great before this recent update..by reading others reviews their seems to be a fix incoming! hope so, i'll checking back here.. edit: 3 days and still no fix even though the devs have said these is a fix incoming...

The current July 9th Update keeps causing FireFox to lag or slow down to the point of it's not working. Please fix this.

firefox says your slowing youtube.com down. Might want to fix that. I'm leaving it up in case i'm getting scammed. edit : It's still not working. I have contacted youtube about the issue as well now.

I've been using this for a few months now, and I love that it blocks and alerts me to unsafe websites.

However, recently I've been getting alerts from FireFox telling me that this addon is slowing down the browser.

I have no idea why this is happening as I haven't changed anything, so I don't know if it's an update that has caused it, but it needs to be investigated otherwise it's likely people could disable the addon.

The July 9th update has broken browser guard. It freezes everything and simply does not provide any benefit. In fact, I am now paying for something that breaks functionality across my browsers. I have no other extensions installed, and everything was fine before the update.

So I am paying for a service that actually causes vulnerabilities... Pretty unethical. I'll give it a few days for a hotfix... But there are other options that actually work so... Please fix this... I hate paying for things that actually make me unsafe...

The only purpose was to make me scared >:/ It gave me info from 1 month ago, when I DIDN'T EVEN HAVE THIS ACCOUNT- and just acted like I had malware IN my computer when I just looked at a infected url.

It's handy sometimes, but lately it's been far more annoying than helpful. It does this thing to prevent clipboard hijacking where it gives a popup whenever I copy something, and then prepends "[SUSPICIOUS CONTENT]" to the start of the clipboard, and I do a lot of copy-pasting; so the only thing hijacking my clipboard is this extension.
I removed its clipboard permission to stop this, and now once or twice a day it will hijack my browsing session (usually in the middle of watching a video) to open a new tab and ask for permission back.