Hide videos of blacklisted users/channels and comments
On the latest version (59) of Firefox the script works fine for me on both the old and new youtube's layout either using Tampermonkey or Greasemonkey... Is your browser updated? What userscript manager do you use?
Blocked Users have Returned
Can't find/see (x) next to users to select Block User function & Library of Blocked Users has vanished from the top of my browser.