Despite being signed up and logged in the app doens't work. It tells me that key features are missing and that I should sign-up.

good

It sends all input data to the external server.

A truly helpful browser extension.

It doesn't connect to your account even after you log in

Does not work with the SalesForce for firefox ubuntu.

Poor integration with MyBB fourms.

This add-on doesn't work properly on the latest Firefox.

Double click feature is awsome!

Very Nice

Works if I don't edit while typing, for example on a comments page. Every time, I correct something or change a word, all the previous changes Grammarly corrected goes back to what it was, and I have to fix them again, very tiresome. Seems like it has Alzheimer's. May be a bug.