I would actually give this add-on 10 stars, if it were the legacy version - the "old" one. But I was surprised with the notification of this one when I opened the browser this morning, and there was no Options page, no Button, and thank god I still had the other one installed. So, I tried the old one with a YT vid. song, and it worked beautifully. I disabled it, restarted my browser, and there still wasn't a button for this one, so it was useless to me. I checked to see if it was hiding in customization. Nothing. I used the legacy version 2-3 times a week, all the time, and never a problem one. It was perfect. I can see from the other reviews here, that I am one of MANY with the exact same problem. I do not know what to do now. I am using FF56. I hope this is resolved quickly. This whole transition has been a nightmare, and I need this. I'll probably end up going to Chrome like everyone else. Countless people are already packing their bags, as I write this. It is truly a shame. Thank you for a fantastic add-on - THE OLD ONE - though. I loved it.