I have used it before on other browsers and think its a good tool. However I cant even get it installed at the moment. I click install, it looks like it is installing but doesn't install .

No me deja instalarlo.
Me dice que está corrupto.

I would NEVER use this extension ever again since it was the one that directly responsible for placing Opencandy on my pc. The ONLY issue I had on my pc in Years. OpenCandy is an Adware module classified as malware by many anti-virus vendors. They flag OpenCandy due to its undesirable side-effects.

This one is periodically sending "LOGS" to

f-log-extension.grammarly.io

So watch out!

Dev/s any explanation for this?

Although it was in "featured" section, but when it asks for permissions, it asks to access all my data on all website which is quite suspicious. Will it access my passwords and login details as well as bank information as well?

Spell check is highly inaccurate even allowing for differences in US & UK spelling.
Grammar check is a hoot.

Last and most critical application inserts promo codes that really dick up the results to the point I'm getting error messages for the extra codes.

The very first world it decided to spell check? [not grammar] was in English correct but in American wrong as they miss out letters all over the place. In this case changing the meaning or meaning one of two things. Making uncertainty where English had clarity. I have removed it. It lasted 3 minutes. I suspect my grammar is better than the usual user. I still know that then and than are different, quite different.

Okay if you're not good a grammar, but only really useful for Americans - can't be changed to English spelling.

complete waste of time, slow inefficient, induces errors of it's own making me take the time to correct them.

Do not use. At all.

Not suitable for fast typers, incredibly slow and has now started a war with Adblockers because of their YouTube adverts. I have uBlock origin installed and yet this still gets through. Complete BS.

Also requires you to sign up for an account, in which several adverts didn't tell you about, all for a crappy spellchecker plugin.

they just want to collect data (what you write on youtube and facebook , a complete scam

it block dictionaries and do not works at all as expected (easy expected)

It is so annoying. grammarly grammarly grammarly ... I already hate them. Watching one single interview being interrupter 5 (FIVE!) times by this irritating stuff

It's not even working... BS

Requires you to signup for an account. Doesn't mention that in the description.

NOT WORKING FOR THE Firefox 55.0b8 64-bit *version.

Serious bug, stopped working, keeps prompting me to login, I do, same message, useless in Fireforx

I submited the solution of fixing blank popup page issue via their support as a paid user long time ago, but their support refused to pass the message to devs...

I tried adding a forum post to MSDN. It appeared peppered with all the HTML source/tags from Grammarly attempting to fix my technical words that it didn't understand. Hence I had to copy/paste to notepad, remove them all, uninstall grammarly then paste the text back into the forum post.