Rated 4 out of 5 stars

yes youku ok, now
Firefox - NPAPI 24.0.0.221

This review is for a previous version of the add-on (24.0.0.194). 

Rated 3 out of 5 stars

youku.com failed box image

This review is for a previous version of the add-on (24.0.0.194). 

As I can see videos are playable. Maybe you just need to update your ad-blocker config.