I have used this add-on several times, only to find that #1) It is the worst spell and grammar checker ever, and often highlights words and grammar that are correct. And #2) It significantly slows down my typing and browser. As soon as I removed it, my typing and browser speed was fine. I would give it NO stars if I could. /// In response to the Developer. It affected all websites I use on Firefox. I've never had issues before, and when I removed your app, the slowdown stopped. As for bad corrections, I no longer use the app, so I do not have screenshots and wouldn't know how to post them here anyway, because there is no way to post photos. Update: 4.25.21 I am going to give it a try again and see what happens. I removed some other add-ons and maybe they were the problem. Will update soon!