muy bueno y entretenido de usar
me gusta que puedas usar palabras que usas pero que no son del diccionario

A really good resource for me as a non-native speaker in English and Swedish. Would be good if you could choose between different "stiles" (academic writing, report e.g.). Therefore only 4 stars, but maybe I am too picky.

хорошо работает

Superb

Forse uno dei più comodi e funzionali estensioni di Firefox.
Davvero consigliato!

Great extension to correct grammar of russian language, far from perfect, but works good enough

Using this addon for months. Excellent interface and very useful. Kudos.

Limited demo of a paid app. The list of languages on the site is limited to "English, German, Spanish, French, Portuguese, and Dutch", which may make it appear that spell checking is not available in other languages. You cannot choose "EN-GB" or "EN-US", there is only some kind of "English" with the British flag. So the American language is not supported? Uses a third party sync, not a Mozilla account.