Grammarly slows down Firefox and my typing speed (some keys don't get counted if I type too fast). I would like to suggest adding features to add a button in the post in Facebook for manual checking when you are ready to have it check your post and also one to delay the checking of your post in Facebook until a few seconds after you have stopped typing. I'm not suggesting to limit these features to Facebook. I just don't use other social networking services.

Me parece buena pero aun le falta un poco mas

This extension works as expected in Chrome, but won't underline misspelled words in Firefox. It will still show the green G icon at the bottom and give you a red icon when there are errors, but it won't work for live editing. I would need to open the designated editing field every time I want to check for errors and that is quite inconvenient. I tried to find a way to submit a big report, but Grammarly doesn't seem to have a good way to do it. I have to use Grammarly for work, so I need to switch to Chrome. As soon as this is fixed, I will go back to Firefox because other than that it works fine. This is just a deal breaker for me and until they figure it out it shouldn't be used in a professional field of any sort due to unreliability.

Grammarly is not working again!

Love this extension so much! Has been such a big help.

Doesn't work in Firefox 58.0.2 (64-bit) Manjaro Linux

The be extension a wonderful thing.

Bugs! Break the editor of https://forum.theodinproject.com

Straight up DOES NOTHING on Firefox Nightly 60.0a1 (2018-02-24) (Hasn't worked before this version either)
When I click the icon it always says "Grammarly is active, but
key features are missing" and prompts to sign in. When I click on sign in it just opens the Grammarly page showing that I AM signed in.
That is the only place where it works.

Update:
Still the case on Firefox Nightly 68.0a1 (2019-04-12) (32-bit).
The grammarly icon on text fields is there, but it never seems to figure anything out. Trying to sign in via that icon doesn't work either. After putting in my login details and pressing "login" the button gets a spinning loading icon that spins for a while then stops. Nothing happens.

I'll be using "LanguageTool" instead. At least that works.

This has always worked really well in Chrome, but there seems to be a breaking bug in Firefox that just makes all text entry hang.

Пустое и бесполезное

Excellent

Love this extension. The best grammar tool!

Useful functionality, but introduced lag when typing on some pages (i.e. gmail).

works well

Publicidad engañosa, con pocas posibilidades. Sobrevalorada. Para ser un programa de traduccion, esta todo en ingles y nada más.

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Best around and integrated spell check with insight into my personal common mistakes.
Desktop, online, mobile and document all in one solution.