I've heard many others say this too, I cannot sign in.

I am not being able log into the Grammarly account in the add-on, in Firefox.

Doesn't work whatsoever.

I LOVE IT

Not working. Latest Firefox on Mac.

This extension on Firefox behaves erratically. Meaning, I typically have to go into Markdown Mode for Grammarly suggestions and corrections to "stick" to my postings. The Grammarly extension used with Google Chrome works without issue. I wish this extension installed with Firefox worked the same.