Usually accurate, works nearly everywhere, wrongly tries to correct oxford commas.

This add-on was once great! But now the sign-in button just takes me to my dashboard and does nothing else. I don't use Firefox for much of my writing, anyway.

While Grammarly does a pretty good job, it doesn't fully cater for dyslexia, I still find myself using the google search bar to find a word, but it's the best one I have found so far.

I have difficulty at times with Grammarly not working with facebook. I can get it to work by logging in and at times that doesn't work.