A perfect, FOSS tool, that I believe is better than things like grammarly. It is amazing how well it works. Nit-pick mode and the recent addition of synonyms really help when you quickly need to get work done and are a bit too frazzled to do the lifting yourself.
Even for my weird language, the grammar and nit-picking is on point. Highly recommended, I pay for the full service (though I do not strictly need it) to support this great initiative.

Ótimo. Mas, é uma pena que ele só funcione com a linguagem mais formal. ele não reconhece gírias e linguagens usadas mais comumente no dia a dia.

This is the most amazing spell checker and useful add-on on the internet. Good onya Firefox! Thanks.

Great tool! The Firefox add-on works like a charm, also Google Docs integration is perfect.
But the LibreOffice extension (paid version) is crap! Even when following all the guidelines, it won't work. Some functions do, sometimes - until they crash. But all in all this is a big disappointment, and completely useless.
Maybe it does work with MS Office, but that's not really relevant here.
So, online it's great, offline it sucks! Therefore only 4 stars.

I don't understand why so many people think this should be totally free and use this argument for skipping a star. Nothing is free in this world, and the free version is already excellent for most applications and far more comprehensive than free versions from other companies.
When you are using this professionally, the price is better than fair. When you're using this for fun, be reasonable and appreciate getting great value for nothing in return from your side!

I think It's better than Grammarly.

This add-on works very well for me. The comma suggestions are just what I was looking for :).

Works great, and has great features, recommended.