This add-on is constantly trying to sell you the paid subscription, in a quite invasive way. Not useful for installing it to a non-IT-proficient person.
Additionally, there are not so many site reviews, and I don't find them very useful or trustworthy either.
After testing it for few days, I've decided to uninstall it.

Работает через то самое место последние пол года так точно - чуть что вместо рейтинга сайта выдает список непонятных строчек кода

Rubbish. Filled with ignorant reviews from people who don't understand how the internet works and can't change how your profile name appears so you doxx yourself really easily.

Hard to believe they're still around. No one else has ripped off their users as much as they have.

Пользуюсь давно у меня всё прекрасно. Конфликтов никаких нет.

Mostly good, but tracker blocking is free on AVG but not free here. WOT, pls. make tracker blocking free. startpage.com (my search engine) thinks privacy is a must (a right)

bonjour la protection en real time qui me plais sans oublier les autres service bon continuation abientot

This add-on tags conservative sites as untrustworthy no matter what ratings they got. It blocks them each time you try to visit even after reporting the site as safe. Meanwhile obvious scam sites are not blocked.

Постоянные всплывающие окошки: "КУПИ НАШУ ПРОГРАММУ!", "НУ, ПОЖАЛУЙСТА! КУПИИИ!", "ТЕБЯ ОСТЛЕЖИВАЮТ! КУПИ!", "БЕЗ НАШЕЙ ПРОГИ ТЕБЕ ХАНА! КУПИ!"...
Спасибо, конечно, за ценное расширение, но теперь с ним хуже, чем без него. К тому же, у нас в Беларуси НЕЛЬЗЯ НИЧЕГО КУПИТЬ сейчас. Опять же тормоза и задержки жуткие с этим расширением везде.
Всего доброго!

It's a tracker. That didn't bother me much, but lately it's after your passwords. Now it's malware.

This used to be a good add-on, but last year they redesigned it to be basically non-functional unless you register for their services.
It also vastly slows down browsing; for me it was adding 10-15 seconds for EVERY page load, and significantly slowing down browsing within pages. This was going on for months, which I attributed to browser updates, but after removing this specific extension the problem was immediately resolved.

You can see in older reviews that they keep claiming this was a bug that they've fixed, which is clearly not true.
Do not install this. If you still have it installed from back when it was worth using, the sooner you get rid of it the better.

Now charged to simple security. Used to as a tracker. Suggest everyone remove this ASAP