Hi, I've been thinking for a long time now that it would be really nice of there was an option to also show like-to-view ratio (as percentage), or even dislike-to-view ratio. It's surprisingly important and in many cases better metric to measure video success. You could display it in the same info box with the the like ratio when you hover mouse over the like-dislike bar.
Thanks for reporting this. I just released an update to address the recent issues, but the extension now requires users to enter a personal YouTube Data API key. Instructions for setting up a free YouTube Data API key, and an explanation for why this is required, can be found here: https://github.com/elliotwaite/thumbnail-rating-bar-for-youtube
