Haven't really encountered any big issues with it, it works like expected from what I can see. I've been using it since November 2022 on Firefox and before then on Chromium.

MwB Guard slowing down the browser and websites load... and don't know why the extension is using 25.85MB storage size, you should improve the extension to works better and to use less data size.. otherwise is a great extension does exactly what it says and fits nice with the MwB Premium, besides of issues i have with it. :)

I was beside myself for months struggling to get web browsing to be tolerable. By kismet, I disabled browser guard. The heavens opened and SpaceX launches ceased to buffer. I have used Malwarebytes for years and like it, but this extension has a heavy cost in using the internet.

It's a must-have, not just an ad blocker, but as the name suggests, it also protects against malware and scams! It's rare to make a mistake and have to turn off ad blocking - but if a reliable (!) site doesn't work, then (and only then) do it 8)
HUN: Kötelező, messze nem csak hirdetés blokkoló hanem ahogy a neve is adja malware és scam elleni védelem is! Ritkán téved és tirkán kell lekapcsolni a hirdetés blokkolást - de ha nem működik egy megbízható (!) oldal akkor (és csak akkor) tedd meg 8)
&
"Crash due to high CPU usage" I hope I can fix the bug that is slowing down the browser. But I see that Firefox versions are not updated that much :\
HUN: Remélem sikerül javítani a hibát ami miatt lassítja a böngészőt. De azt látom hogy a verziókat Firefox nem frissítok annyira :\

Sadly detected/blocked by YouTube :(

I love this add-on. Sadly I can't have it enabled at all in my browser anymore because of Youtube/Googles witch hunt for adblockers. Even if I allow list youtube via the add-on Youtube stull blocks me from viewing any video at all. Completely disabling the add-on in Firefox settings and I can watch videos again :/

Lots of false positives for phishing recently. Their heuristics are NOT working properly.

"Developer response
posted 7 days ago
A factory reset of Browser Guard has resolved this issue for many users.

To do so:
Open Browser Guard
On the top right, click the 3 vertical dots
Click "Support"
Click "Factory Reset""

Wish I had seen this earlier. I was pulling my hair out trying to figure out why FF was suddenly so sluggish. It just happened to coincide with getting a new modem from Xfinity so thought that was somehow causing issues. It wasn't until I started disabling addons and got to MBG that everything returned to normal. I was prepared to just leave it disabled, but the above fix worked for me. At least if it happens again, I know where to start. I removed a star from my review for the hair pulling.