Issue: Visual editor won't show

I tried making a post and the visual editor didn't appear so I clicked Go Advanced, and still nothing. I tried it on other threads and it won't appear. I can't make quick reply posts or even edit posts. I'm using Firefox, I had to use Internet Explorer to edit a post I made. Is it Firefox that isn't working? It's updated and all. It just happened today, I'm not actively only but I don't remember this happening before.