for people who want the ad-block feature back, just go to the version history (located under permissions in more information area) then download Version 2.0.121.

but i dont care about that since i have better adblocking addon (ublock origin) and im using this addon to make my youtube experience much better (fk auto quality/video quality control,watching video while reading comments,video speed control,faster volume control,custom script button,etc.). im glad that Enhancer for YouTube is back