Very buggy with latest versions of Firefox. Read the console log as it is beating its brains out to contact an external server that is not responding.

Slows my computer down terribly. I had to turn it off until they fix it.

Also, since it is free, I have concerns that everything I type goes to their server where my data is extracted and sold.

i love how it USED TO WORK. But now it's a piece of crap. I make corrections and they don't not stick. The errors come right back.

The red line supposedly underneath words is somewhere else entirely on the page.

Absolute total buggy garbage and unusable.