This extension works as expected in Chrome, but won't underline misspelled words in Firefox. It will still show the green G icon at the bottom and give you a red icon when there are errors, but it won't work for live editing. I would need to open the designated editing field every time I want to check for errors and that is quite inconvenient. I tried to find a way to submit a big report, but Grammarly doesn't seem to have a good way to do it. I have to use Grammarly for work, so I need to switch to Chrome. As soon as this is fixed, I will go back to Firefox because other than that it works fine. This is just a deal breaker for me and until they figure it out it shouldn't be used in a professional field of any sort due to unreliability.