The dark mode is great. I ahve already used it but had some problems with activating it on Chrome. First I have not found it in settings. Who knows why developers did so?I ahve spent some time while opening it. I ahve read some information and finall found at http://rocketfiles.com/articles/how-to-activate-youtube-dark-mode-in-chrome-firefox-edge-opera that I can use developer's menu (Ctrl+Shift+I ) and put in console tab this code document.cookie=”VISITOR_INFO1_LIVE=fPQ4jCL6EiE; path=/” . And now it's working. Did someone have such issues. The mode is really great.