It says sign in but I did

Doesn't work, asks me to sign into grammarly when I already am. Browser restarts and such do not work to get it functional.

Useless.

Despite me being longed into my Grammarly account, the Firefox extension still says I need to log in. Useless.

As a non-native English speaker, Grammarly has helped me tremendously when writing important emails

I was a spelling champ throughout high school. I have used Grammarly for 4 years and it is super. I might miss a word's correct spelling when in a hurry. Grammarly picks it out and underlines for me. I go back and correct it. IT IS GREAT!!!