Best cheker ever and really easy and fun, no premium needed it is great!

Once you turn it off? You have to re-install it to turn it back on

Після увімкнення цього додатка стали набагато частіше падати вкладки.

It interrupts my writing session by repeatedly asking me to log back on to Grammarly. It doesn't stay logged in.

Es una aplicación excelente, pero consume demasiados recursos, ralentiza el navegador, y a veces lo cuelga y lo cierra. He tenido que deshabilitarlo para que Firefox vuelva a la normalidad. Una pena

The app keeps cutting out and I have to keep installing it every few days. VERY inconvienent (like now-it is apparently off AGAIN. Their support team was not very helpful as you can see.

causes fire fox to crash

You're required to sign up with personal information for it to work, which is absolutely idiotic considering it's just for fixing grammar and spelling.