A few years ago it worked. Now it's plain disgusting. Accessing the options requires looking through a webpage with ads and mandatory adblock disabling, then the options just don't show up anyway. Links are broken. The top bar on Youtube has ad links in it, it obstructs the search bar, and has no useful options either.
This should be removed from Opera Addons entirely, it's not an addon it's adware.
You can use Enhancer for Youtube (Chrome) instead.