http://www.newsweek.com/return-youtube-dislike-browser-extension-google-chrome-firefox-1654339

You can now see the number of dislikes that a video has on YouTube once again, but you need to download a separate browser extension to do so.

Earlier this month, YouTube made the controversial decision to remove the public dislike count on all its videos, in an effort to discourage targeted harassment campaigns that seek to weaponize it. The dislike button itself still remains intact (and, if you negatively react to a piece of content, it will affect your future recommendations), but you cannot see how many other people have used it.