Have very few issues, however nothing is perfect

great to use it's help all the time when you try to writing something, thanks to grammarly

Constantly finding it doesn't actually make the corrections. Or at times it appears to have done so, and once the text input has been sent, you find that it hasn't, or after five to ten seconds, every edit is reverted back to the original state.
Either this is deliberate to get you to pay for the software, or it's a sign of a terrible service.

Grammarly for Firefox de Grammarly

I want to love this, but it's extremely unreliable and buggy. On some sites it won't work at all, on others it's a mess. It keeps inserting words at the cursor or the end of the text instead of where it should go, and inserts duplicate words while I'm typing. Sometimes it works, but more often than not it only makes a huge mess I have to clean up manually. I'm really disappointed.