[iKlsR]

You can try this addon (Unhook: Remove YouTube Recommended Videos Comments) as it does just that and more, my web yt is clean, I don't even have a feed thanks to this.

Chrome - https://chrome.google.com/webstore/detail/unhook-remove-yout...

FF - https://addons.mozilla.org/en-US/firefox/addon/youtube-recom...