I almost forgot I even have this because it integrates so well into Firefox and is non-invasive. I love the options it gives me, and now it lets me finally block YouTube's autoplay, which has always re-enabled itself not long after I've stopped it. Enhancer for YouTube lets you use different themes for YouTube (I use Mint-Y Dark), and the cinema mode is pretty cool. Something else is that when you scroll down from the video as it's playing, a small version of the video could pin to the corner of your screen so you can watch and read comments at the same time. I also like the convenience of just spinning the center mouse wheel to control the video's volume.

I normally don't give 5 star reviews because I can often think of ways for things to improve, but I can't think of anything here. One feature that I find useless is the filters feature, which allows you to affect the brightness, contrast, blur, and coloring of the videos. There's absolutely no instance in which I'd want to do that, as it doesn't enhance anything about my YouTube experience, but I guess it's cool having it there for if bored people want to give Boogie2988 a purple face or watch H3H3 in grayscale. Why anyone would use Gaussian blur is beyond my comprehension. But I can't take off any stars for extra features.

Overall, I suggest that if you use YouTube every day like I do, you should try this out. It's the best YouTube enhancer I've tried out, and it really does improve my viewing experience.