My big problem is the grammar checker. I just want an extensive spell checker. I write in a very personal style, something this grammar checker doesn't understand. Mrs Patterson, my English language teacher way back in the ninth grade drilled decent grammar into her student. I use it as I choose; I'd rather not have this addon nagging all the time. Just check the spelling.

Works well, mayor security problem: allText (including passwords you enter) is sent to a server outside of your control. Deleted immediately.
I find it incredible that this is a recommended app. Does mozilla not care about the privacy of its users?

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.

LanguageTool just isn't very good. Get proper lessons, don't be lazy and "smart". Nothing special about addon... False negatives are not rare.

LanguageTool has quite low limits 150,000 characters as of 2023 for anything long.

Not really helpful. Has a lot of hard coded grammar rules that do not apply in all circumstances, actually making it more difficult to write with this tool on.

Nuit à la rédaction des annonces sur eBay. Une fois l'annonce publiée, le texte a disparu.

Désactive l'accès au dictionnaire personnel de Firefox que l'on ne peut plus alimenter, méconnaît les noms propres les plus courants, trouve des erreurs là où il n'y en a pas et n'indique pas où elles se trouveraient. C'est un produit d'appel inutilisable sans passer à la caisse.

I swear sometimes it just doesn't help you in some of the ways it used to and just presents the dreaded "advanced error" notification on the bottom right. I switched to LanguageTool to get away from just that but it seems to have creeped in here too. That and some words are just labeled wrong for no reason? I understand I'm on the basic plan but I'd rather not be pestered about what I COULD be fixing.

Kennste das, du sagst einem Addon "Deaktivier dich", und bei der nächsten Aktion ist es wieder Aktiv, ohne dass du danach gefragt hast? Nein, ich eigentlich auch nicht ... so nervig, wenn ansich nützliche Addons duch so schwachsinnige Akionen so nervig werden, dass man sogar soweit geht, eine ish Rezension zu schreiben ...

I recently noticed that typing was being delayed. I spent ages trying to work it out. Uninstalles Firefox, reinstalled. Cleared cache. The I uninstalled this app. Not just stopped it running, uninstalled it and typing back to normal. Then I realised, it's not even been spell checking for some time now.

The LanguageTool spell checker APIs are great, but I'm disappointed by the addon:

- adds a lot of noise in dev tools: data attributes, lots of opaque event listeners, dozens of CSS variables.
- I don't need constant nudges to upgrade to premium—I'll do it if I'm happy with the default version.
- the source on GitHub is outdated—where can I find the source for the new addon?

Kind of a useless addon... it takes you to a website where you can see the errors but it does not clearly show the correct spelling of those words.

It is far quicker just to use another service such as google.

Sadly no Indonesian, Javanese, and Balinese language option in this spell checker extension.

This used to work brilliantly. However, it now only highlights grammar and spelling mistakes as clicking on suggestions no longer replaces the misspelled word or corrects the grammar.
I have removed and re-installed twice to try and fix this fault to no avail.
It is now of minimal use.

Pour faire un test j'ai écrit une phrase contenant 6 fautes d'orthographe, et le correcteur ne m'en a signalé que 3, pour une note de 50%. Plutôt inutile!

Refuses to work no matter what I do. I have tried Restart Firefox, delete and reinstall the extension, Delete the extension then uninstall Firefox then reinstall Firefox then the extension. Nothing worked.

I don't get it. In basic mode the ad-don does nothing. Right click on selected text opens new tab with misspelled word highlighted. And that's it. The misspelled word never gets replaced...and it shouldn't open a new tab either...as it is, it's useless. Please advise. Thank you...

Absolutely fantastic piece of software, except for when it stops working entirely to push you an incredibly unsubtle ad for their premium service.

This addon is good but has some disadvantages burdens the operation of the browser and so websites, :-( while I would like such problems with this extension was not and I hope that over time it will change for the better by making another very large update : - )

It is barely more useful than the default spell checker. What I wanted from this is an auto-detect for auto-switching languages. It hasn't implemented it. It also doesn't show the squiggly lines and is quite buggy.

But above all, it uploads every keystroke to its corporate servers... So... uninstall immediately, how bloated and intrusive is that? No thank you, either take all the code to the client add-on or don't make a spelling add-on at all....

Generally a good extension, but unfortunately not available for Android.