I have been using Grammarily for some time. It has been very useful for spelling and a lot of commas. I have rewritten some paragraphs for clarity which is also helpful. It occasionally makes verb errors with compound sentences. Sometime it wants me to change a word but it will change my meaning or emphasis. I do think it is a useful tool and have renewed my subscription.

does not work most of the time, Just not compatiable with Firefox version 87

Thank you for your kindness, Grammarly maintainors. ( I've received DM on twitter.)
While installing this,
I was using spreadsheet the gnumeric app of current version, and loading a very old version of a ".gnumeric" file containing charts, it might cause PC freeze...
My silly early detection might found a false reason... it should not be your false...

This time, I lost a chance of timing to install yours... sorry...

I enjoy all the features this app offers, but I gave it a three out of five because it slows my browser considerably. Most especially, it freezes completely in G. Docs.

I have been using this addon for quite a long time now and I find it really helpful. But the issue I am facing is, it won't log me in. Although, I am logged in to the website but in the text boxes, it never logs in. I hope you get my point and fix the issue.

I am honestly not impressed with this add-on at all. Everybody always talks about Grammarly and how fantastic it is, but it honestly is far from great in my opinion. It always tries to correct basic grammatical mistakes that are, in fact, not mistakes, as well as neglect to correct mistakes that are, in fact, there. I would personally prefer Linguix, which isn′t perfect either, but definitely better than this. Everything about this add-on is decent but it′s little mistakes like the ones I mentioned that it makes that prevents me from using it.

It interrupts my writing session by repeatedly asking me to log back on to Grammarly. It doesn't stay logged in.

I like Grammarly for Firefox but I can't find the extension for Twitter. Grammarly claims there is an extension for Twitter but there is no way of accessing it. Grrr!

nice

I like the exstention, tough there is one flaw I've noticed when Using it with Firefox...
If I right click on a word that Grammarly selects to "correct" it there is a 70% chance that the word isn't changed but gramerly pastes the correct spelling at the location where my cursor is... this isn't useful at all (example, I write "hello, how is you day going" and it should correct you to your, if I would correct that after typing going grammerly would change it to "hello, how is you day goingyour" :/)