No automatic correction option, only reason I tried it.

no ai bs plz

使うことができない品質。
Quality that cannot be used.

設定やメニュー＝英語のみ。長文。
Settings and menus = English only. Long sentences.
母語設定がない。
No native language settings.
色彩設計が無設計。彩度が高すぎる。
No color design. Too high saturation.

例 Example：
①家からの時間での勉強を会話しない。
　Incorrect grammar→「ＯＫ！」
②使うことができない。
　（Ｎ５）
　correct→「error!」
③女は男だ。
　（Ｎ５）
　Incorrect meaning→「ＯＫ！」

Firefoxの「おすすめ」に表示されます。
Yet it shows up in Firefox’s “Recommended”.

作者は母語話者の本当の会話を見て、Ｎ５〜Ｎ１を学習してください。
Authors, please watch real conversations by native speakers and study N5 to N1.
さよなら絶望先生。
Goodbye Zetsubou Sensei.

Don't care for it.

Kept telling me "1 More Writing Issue Found" and hid it behind a paywall with no way for me to disable it.

What this means is on half of everything I end up typing, it ends up going orange as if I've made a typing error.

But I can't see it unless I pay.

If they just didn't make that orange, I'd be ok.

I'm not paying for something that literally annoys you until you pay for it, and I won't use something like this that won't let me disable or hide suggestions I can't view unless I pay.

Maybe I would have payed if it quietly and politely suggested there was another issue I could fix, but I refuse to pay for it when the developers use annoyance to try and get users to pay.

Uninstalled.

Will legitimately not work for me, no matter what I try. It tells me that I have not written enough (minimum of 5 characters) even when I have written hundreds of words, and it will not update at all. Completely useless.

Don't bother unless you already plan on paying for it. This is bad if you're using it for free.

If you don't pay, it will sometimes say something to the effect of "one more writing error detected", but you can't get it to elaborate or remove this notification without paying. It's infuriating to the point that I couldn't continue using it.

Keeps automatically changing language on me. Very annoying and there's no option to change it back.

This is a privacy nightmare, so obviously "Recommended" by Mozilla.

Dear lord..

It's not FOSS nor Open Source!

I guess it's useful if you're terrible at writing, and it's helped me fix a couple minor errors, but overall this tool is terrible. It recommends putting commas everywhere you could possibly think of, misses a ton of grammatical errors, and is generally not useful. The thing that drove me over the edge was when it would recognize "Dursley" and "Dursley's", but would correct "Dursleys" back to "Dursley's".

It's more of a nuisance than a help.

Türkçe neden yok? bu yüzden kullanamayacağım. :(

Not very good at the Basic level. Hard core sales to upgrade to the paid level. I already use Grammarly.

Works quite well, but the red warning message with supposedly further errors found, which you can only see in the premium version, makes the tool useless and confusing. Deleted.

Only Portuguese from Brazil is available.

It is sad that the add-on is no longer open source and does not make transparent what is read and transmitted to the server. Complete regression.