It's great! Not surprised my native language isn't available as it doesn't have many speakers, but the number of languages offered more than makes up for that. (there's even ones I've never seen spell checkers for before)
The only thing I would like is if mistakes such as e instead of è could be detected for italian as they are different words depending on the context, but I understand if this is maybe harder to detect.

This add-on is really useful, athough it sometimes uses American instead of UK English, which can get rather annoying at times.

All-in-all, I'd still recommend it.

👍

Das Add-On ist super hilfreich!

Es el primer mejor corrector al igual que mate traslate

ok

В русском регулярно предлагает ошибочные исправления. Нужна какая-нибудь кнопка, чтобы пользователь мог на это указать. Особенно под орфографию стоило бы прикрутить какой-нибудь официальный словарь.

This tool has a smooth easy to use interface and works better than any other tool that I've used.

An excellent tool with a lot of grammar, sentence structure and style tips as well!
The reason why I gave it a 4/5 was because I type Dutch and German a lot and this add-on has limited support for compound nouns in these languages. (although it does support them far better than the browser's spellchecker does by itself)

лучший корректор в мире!

Though not perfect, I'm getting to like it more and more. I love how it offers you the correct solution by just hovering over the error word. I had the Basic version before and, I hope, now with the extended version even those small issues can be fixed. Regardless I like it very much, and in a way, it does make come across as smarter.