Be advised, Youtube is stuttering and lagging with this extension for now.

works as expected

This ext makes your UtubeXperience seriously enriched.
Absolutely must-have ext.

定制功能很多，另外希望能增加谷歌翻译CC字幕的功能，英语字幕有的太快了看着比较费劲，本来水平就不行。

Pretty Good but the Themes take ages to adapt to design changes of the website

Simply perfect. It has a loop with custom timestamp, equalizer and more. I recommend.

Breaks Youtube in Firefox. Was constantly getting error messages. Could not watch a single Youtube video for months now. Totally frustrated, I went on a quest to learn how to troubleshoot the problem. When I disabled "Enhancer for YouTube" suddenly Youtube started working again. Every YouTube video plays just fine now that I have removed this from both Firefox and the Cliqz browser (Firefox based). Can't believe an addon that was supposed to improve YouTube performance actually broke YouTube entirely. Probably an update to Firefox that broke the addon somewhere along the way, but YouTube works just fine now that I've removed this addon, after months of having to tediously copy any video URL that I wanted to watch over to another browser. Enhancer for YouTube gone = problem solved.