The new Interface is awful.

new UI is so busy and hard on the eyes. all the buttons are crammed into the video bar and there's no option to change it.

Disabled. Doesn't block ads on Youtube. Made sure it was enabled in Addons. I had all but the optionals enabled. Youtube still keeps kicking over to ads.

uninstalled. butthurt developer that can't take criticism. For everyone having received the same fate (know for a fact there are more), i found alternatives in the greasefork community.
plus, currently bugged anyway (march 2021)

Doesn't work.

Should be open source.

used to work well, now youtube pages lock up for 3-5 seconds before fully loading.

it doesn't work

Leider nur 1 Stern . Meine Einstellungen werden ständig gelöscht . Und am nächsten Tag muss ich wieder alles neu einstellen . Hab keine Lust mehr .🤮

Doesn't block the obnoxious "White background" youtube ads that play before the video starts, and that was the only reason I tried this one out (as it was claiming it blocked all ads).

This extension present problems using my keyboard and in some pages make some conflicts using speed keyboard like numbers to make a choice in a web without using the mouse for an example.

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.