A few words from someone who literally tried ALL Looping add-ons for YT :) So,after installing this add-on i got two buttons LOOP ON and LOOP OFF. So, huge plus, I like they are below the video, not on the FF UI, I just like it better this way. Additionally, turning the Loop OFF doesn't make the whole page reload - the video just stops after it's finished , nor does this happen when you press ON when in the middle of the video , but if it's finished and you press ON, it starts playing . The buttons are relatively small, but big enough to click, look like something YT would make, and don't give you stupid features like repeating a part of the video. One thing I REALLY don't like, after pressing a button I got a pop-up, informing me i pressed it and the Loop is ON/OFF. Unfortunately, you have to press OK to go forward. Still, it's nice, clean, does what it name says and does it well, so I will keep it, but try to find a way to permanently disable this pop up, since for me it's really unnecessary. And if developer is reading this - please disable it, and perhaps make two buttons into one? Would be great, too! :D Overall, considering what other similar add-ons do (or try to), I give this one 5/5.