They miss a few, and sometimes they offer unnecessary corrections. For example, I typed the sentence, "If they were wolves..." and the correction that popped up was "werewolves."

But, for the most part, they've been very helpful.

The Grammarly Add-in for Firefox is amazing. I don't think I could live without it (I'm not willing to find out). The only small drawback is that it can be quite slow with coming up with replacement suggestions. Even though my laptop is quite high-end. But overall, this is a very useful addon and I highly reccommend using it.

I wish it would be capable enough to analyze complicated sentence structures and compound sentences, such as those including inversion, subjunctive mood, and mixed-type if-clauses (unreal conditionals, especially past - future and present-past types).

It works as advertised and I find it valuable when writing email and updates to clients, but it's input window is laggy and it consumes a huge amount of CPU (i7, 8G RAM) to the extent that it's near pinning the CPU when I'm typing an email sometimes. I've used the plugin on Chrome and never noticed it being resource hungry, so there's something odd here.

I've found it useful to turn it off in the input window via it's widget, type the message, and then turn it on and let it parse the entire message rather than live as I type. That seems to work well.

It's a great add on but doesn't work on every textbox, even isn't working while I type this although the size and sort are OK. Works on whatsappweb making the textbox bigger (adding blank lines). I'll keep it for Gmail spelling check!

I have the same impression as Larry...
Grammarly is a Gremlin Rated 1 out of 5 stars
by Larry on January 25, 2017.
"How do I get rid of this annoying add-on? ...Next uninstall will be Mozilla".

Well, I won't throw the baby out with the bathwater. I intend to keep using Firefox; however, this Add-on has a nag popup that opens another browser tab directly to its home page each time I open Firefox to go to the web- perfect right? Just what anyone would want and expect. This is what I see attached to the end of Grammarly's home address in the rogue tab's URL address bar: "...sign up?page=free extension _install=true breadcrumbs=true"

This just won't go away. Can anyone help me with this annoyance? I like the Add-on. It is a very good tool but I am about ready to dump it.